mirror of
https://github.com/IfcOpenShell/IfcOpenShell.git
synced 2026-08-16 02:24:30 +00:00
Petru Conduraru
5a7ab0ca68
get_entity_doc returned incomplete descriptions for many entities and
types, e.g. IFC4 IfcAlarmType ended mid-sentence at "The set of shared
information may include:". The DocExtractor took only the FIRST <p> of the
markdown-derived HTML (BeautifulSoup .find("p").text), silently dropping
any bulleted list embedded in the definition and every paragraph after it.
Add DocExtractor.extract_full_description, which walks all top-level
<p>/<ul>/<ol> elements in document order (list items rendered as "- item"),
stops before any <blockquote> (HISTORY/NOTE remarks), and strips inline
kramdown attribute markers. The four entity/type extraction sites now use
it; the property-set extraction sites are left untouched to keep this
change scoped.
The shipped schema JSON data is refreshed from the buildingSMART IFC doc
sources (IFC4.0.2.1 and Ifc2.3.0.1): 1491 entity/type descriptions are
completed. Only top-level description fields change; attribute
descriptions and all other fields are byte-identical to the previous data,
and 11 regenerated descriptions containing extraction artifacts were kept
at their previous text.
Verified: IfcAlarmType now includes the full "may include" list and the
closing paragraph; IfcBeamType, IfcWindow and IFC2X3 IfcWallStandardCase
spot-checked complete with no HISTORY leakage.
Generated with the assistance of an AI coding tool.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
5732 lines
1018 KiB
JSON
5732 lines
1018 KiB
JSON
{
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"Ifc2DCompositeCurve": {
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"description": "An Ifc2DCompositeCurve is an IfcCompositeCurve that is defined within the coordinate space of an IfcPlane. Therefore the dimensionality of the Ifc2DCompositeCurve has to be 2.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifc2dcompositecurve.htm"
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},
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"IfcActionRequest": {
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"attributes": {
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"RequestID": "A unique identifier assigned to the request on receipt."
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},
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"description": "An IfcActionRequest is a request for an action to fulfill a need. *Use Definitions* Requests may take many forms depending on the need including fault reports for maintenance, requests for small works, purchase requests (where these are to be made through a help desk or buying function) etc. A request may call for several actions and an action may refer to several requests. IfcRelAssignsToControl is used to relate one or more requests to an action. *Property Set Use Definition*: The property sets relating to an IfcActionRequest_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcActionRequest are part of this IFC release: - Pset_ActionRequest: property set for the properties of a request for a facilities management action, if available",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcactionrequest.htm"
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},
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"IfcActor": {
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"attributes": {
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"IsActingUpon": "Reference to the relationship that associates the actor to an object.",
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"TheActor": "Information about the actor."
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},
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"description": "The IfcActor defines all actors or human agents involved in a project during its full life cycle. It facilitates the use of person and organization definitions in the resource part of the IFC object model. *Property Set Use Definition*: The property sets relating to the IfcActor are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcActor are part of this IFC release: - Pset_ActorCommon: common property set for all actor occurrences",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcactor.htm"
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},
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"IfcActorRole": {
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"attributes": {
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"Description": "A textual description relating the nature of the role played by an actor.",
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"Role": "The name of the role played by an actor. If the Role has value USERDEFINED, then the user defined role shall be provided as a value of the attribute UserDefinedRole.",
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"UserDefinedRole": "Allows for specification of user defined roles beyond the enumeration values provided by Role attribute of type IfcRoleEnum. When a value is provided for attribute UserDefinedRole in parallel the attribute Role shall have enumeration value USERDEFINED."
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},
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"description": "A role which is performed by an actor, either a person, an organization or a person related to an organization.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcactorrole.htm"
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},
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"IfcActuatorType": {
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"description": "An IfcActuatorType defines a particular type of actuating device that is typically used in a control system such as a building automation control system. *Use Definitions* An IfcActuatorType provides for all forms of actuator. Usage of IfcActuatorType defines the parameters for one or more occurrences of IfcDistributionControlElement. Parameters may be specified through property sets that are enumerated in the IfcActuatorTypeEnum data type. *Property Set Use Definition*: The property sets relating to the IfcActuatorType defined by the IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcActuatorType are part of this IFC release: - Pset_ActuatorTypeCommon: property set for the properties common to all types of actuator, if available - Pset_ActuatorTypeLinearActuation: specific property set for the properties of a linear actuator, if available - Pset_ActuatorTypeRotationalActuation: specific property set for the properties of a rotational actuator, if available - Pset_ActuatorTypeElectricActuator: specific property set for the properties of an electrical actuator, if available - Pset_ActuatorTypeHydraulicActuator: specific property set for the properties of an hydraulic actuator, if available - Pset_ActuatorTypePneumaticActuator: specific property set for the properties of a pneumatic actuator, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
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"predefined_types": {
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"ELECTRICACTUATOR": "A device that electrically actuates a control element.",
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"HANDOPERATEDACTUATOR": "A device that manually actuates a control element.",
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"HYDRAULICACTUATOR": "A device that electrically actuates a control element.",
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"NOTDEFINED": "Undefined type.",
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"PNEUMATICACTUATOR": "A device that pneumatically actuates a control element.",
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"THERMOSTATICACTUATOR": "A device that thermostatically actuates a control element.",
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"USERDEFINED": "User-defined type."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcbuildingcontrolsdomain/lexical/ifcactuatortype.htm"
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},
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"IfcAddress": {
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"attributes": {
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"Description": "Text that relates the nature of the address.",
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"OfOrganization": "The inverse relationship to Organization to whom address is associated.",
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"OfPerson": "The inverse relationship to Person to whom address is associated.",
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"Purpose": "Identifies the logical location of the address.",
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"UserDefinedPurpose": "Allows for specification of user specific purpose of the address beyond the enumeration values provided by Purpose attribute of type IfcAddressTypeEnum. When a value is provided for attribute UserDefinedPurpose, in parallel the attribute Purpose shall have enumeration value USERDEFINED."
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},
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"description": "An abstract entity type for various kinds of postal and telecom addresses.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcaddress.htm"
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},
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"IfcAirTerminalBoxType": {
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"description": "The element type IfcAirTerminalBoxType defines a list of commonly shared property set definitions of an air termainal box and an optional set of product representations. It is used to define an air terminal box specification (i.e. the specific product information, that is common to all occurrences of that product type). An air terminal box type is used to define the common properties of an air terminal box that may be applied to many occurrences of that type. An air terminal box typically participates in an HVAC duct distribution system and is used to control or modulate the amount of air delivered to its downstream ductwork. Air terminal box types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcAirTerminalBoxType are represented by instances of IfcFlowController or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_AirTerminalBoxTypeCommon: common property set for all air terminal box types",
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"predefined_types": {
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"CONSTANTFLOW": "Terminal box does not include a means to reset the volume automatically to an outside signal such as thermostat.",
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"NOTDEFINED": "Undefined terminal box.",
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"USERDEFINED": "User-defined terminal box.",
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"VARIABLEFLOWPRESSUREDEPENDANT": "Terminal box includes a means to reset the volume automatically to a different control point in response to an outside signal such as thermostat: air-flow rate depends on supply pressure.",
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"VARIABLEFLOWPRESSUREINDEPENDANT": "Terminal box includes a means to reset the volume automatically to a different control point in response to an outside signal such as thermostat: air-flow rate is independant of supply pressure."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcairterminalboxtype.htm"
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},
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"IfcAirTerminalType": {
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"description": "The element type IfcAirTerminalType defines a list of commonly shared property set definitions of an air terminal and an optional set of product representations. It is used to define an air terminal specification (i.e. the specific product information, that is common to all occurrences of that product type). A air terminal type is used to define the common properties of a air terminal that may be applied to many occurrences of that type. An air terminal is a mechanical device used to control the characteristics air at the entrance or exit to an open system, such as a room or space. Air terminal types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcAirTerminalType are represented by instances of IfcFlowTerminal or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_AirTerminalTypeCommon: common property set for all air terminal types Pset_AirTerminalTypeRectangular: property set for rectangular shaped air terminal types Pset_AirTerminalTypeRound: property set for round shaped air terminal types Pset_AirTerminalTypeSlot: property set for slot air terminal types Pset_AirTerminalTypeSquare: property set for square shaped air terminal types",
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"predefined_types": {
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"DIFFUSER": "An outlet discharging supply air in various directions and planes.",
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"EYEBALL": "",
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"GRILLE": "A covering for any area through which air passes.",
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"IRIS": "",
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"LINEARDIFFUSER": "",
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"LINEARGRILLE": "",
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"NOTDEFINED": "Undefined air terminal type.",
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"REGISTER": "A grille typically equipped with a damper or control valve.",
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"USERDEFINED": "User-defined air terminal type."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcairterminaltype.htm"
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},
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"IfcAirToAirHeatRecoveryType": {
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"description": "The element type IfcAirToAirHeatRecoveryType defines a list of commonly shared property set definitions of an air-to-air heat recovery device and an optional set of product representations. It is used to define an air-to-air heat recovery device specification (i.e. the specific product information, that is common to all occurrences of that product type). An air-to-air heat recovery type is used to define the common properties of an air-to-air heat recovery device that may be applied to many occurrences of that type. An air-to-air heat recovery device is typically used to transfer heat from warmer air in one chamber to cooler air in the second chamber (i.e., typically used to recover heat from the conditioned air being exhausted and the outside air being supplied to a building). Air-to-air heat recovery types may be exchanged without being already assigned to occurrences. The occurrences of the IfcAirToAirHeatRecoveryType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_AirToAirHeatRecoveryTypeCommon: common property set for all air-to-air heat recovery types",
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"predefined_types": {
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"FIXEDPLATECOUNTERFLOWEXCHANGER": "Heat exchanger with moving parts and alternate layers of plates, separated and sealed from the exhaust and supply air stream passages with primary air entering at secondary air outlet location and exiting at secondary air inlet location.",
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"FIXEDPLATECROSSFLOWEXCHANGER": "Heat exchanger with moving parts and alternate layers of plates, separated and sealed from the exhaust and supply air stream passages with secondary air flow in the direction perpendicular to primary air flow.",
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"FIXEDPLATEPARALLELFLOWEXCHANGER": "Heat exchanger with moving parts and alternate layers of plates, separated and sealed from the exhaust and supply air stream passages with primary air entering at secondary air inlet location and exiting at secondary air outlet location.",
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"HEATPIPE": "A passive energy recovery device with a heat pipe divided into evaporator and condenser sections.",
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"NOTDEFINED": "Undefined air to air heat recovery type.",
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"ROTARYWHEEL": "A heat wheel with a revolving cylinder filled with an air-permeable medium having a large internal surface area.",
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"RUNAROUNDCOILLOOP": "A typical coil energy recovery loop places extended surface, finned tube water coils in the supply and exhaust airstreams of a building.",
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"THERMOSIPHONCOILTYPEHEATEXCHANGERS": "Sealed systems that consist of an evaporator, a condenser, interconnecting piping, and an intermediate working fluid that is present in both liquid and vapor phases where the evaporator and condensor coils are installed independently in the ducts and are interconnected by the working fluid piping.",
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"THERMOSIPHONSEALEDTUBEHEATEXCHANGERS": "Sealed systems that consist of an evaporator, a condenser, interconnecting piping, and an intermediate working fluid that is present in both liquid and vapor phases where the evaporator and the condenser are usually at opposite ends of a bundle of straight, individual thermosiphon tubes and the exhaust and supply ducts are adjacent to each other.",
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"TWINTOWERENTHALPYRECOVERYLOOPS": "An air-to-liquid, liquid-to-air enthalpy recovery system with a sorbent liquid circulates continuously between supply and exhaust airstreams, alternately contacting both airstreams directly in contactor towers.",
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"USERDEFINED": "User-defined air to air heat recovery type."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcairtoairheatrecoverytype.htm"
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},
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"IfcAlarmType": {
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"description": "The IfcAlarmType defines a device that signals the existence of a condition or situation that is outside the boundaries of normal expectation or that activates such a device. *Use Definitions* An IfcAlarmType may be included into the spatial context of the building model through an (or multiple) instances of IfcDistributionControlElement. Usage of IfcAlarmType defines the parameters for one or more occurrences of IfcDistributionControlElement. Alarm types include the provision of break glass buttons and manual pull boxes that are used to activate alarms. These should be used for alarms rather than a 'user defined' type of IfcSwitchingDevice. *Property Set Use Definition*: There are no predefined property sets for IfcAlarmType in this release *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
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"predefined_types": {
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"BELL": "An audible alarm.",
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"BREAKGLASSBUTTON": "An alarm activation mechanism in which a protective glass has to be broken to enable a button to be pressed.",
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"LIGHT": "A visual alarm.",
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"MANUALPULLBOX": "An alarm activation mechanism in which activation is achieved by a pulling action.",
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"NOTDEFINED": "Undefined type.",
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"SIREN": "An audible alarm.",
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"USERDEFINED": "User-defined type.",
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"WHISTLE": "An audible alarm."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcbuildingcontrolsdomain/lexical/ifcalarmtype.htm"
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},
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"IfcAngularDimension": {
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"description": "The angular dimension is a draughting callout that presents the plane angle measure between two non parallel orientations. It consists of a dimension curve and may have projection curves. Illustration:",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcangulardimension.htm"
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},
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"IfcAnnotation": {
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"attributes": {
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"ContainedInStructure": "Relationship to a spatial structure element, to which the associate is primarily associated."
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},
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"description": "An annotation is a graphical representation within the geometric (and spatial) context of a project, that adds a note or meaning to the objects which constitutes the project model. Annotations include additional line drawings, text, dimensioning, hatching and other forms of graphical notes. If available, the annotation should be related to the spatial context of the project, by containing the annotation within the appropriate level of the building structure (site, building, storey, or space). This is handled by the IfcRelContainedInSpatialStructure relationship. *Geometry Use Definitions* The geometric representation of any IfcAnnotation is given by the IfcProductDefinitionShape and IfcLocalPlacement allowing multiple geometric representations. Local Placement The local placement for any IfcAnnotation is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Geometric Representations The standard representation of IfcAnnotation is defined using 'GeometricCurveSet' or, when including surfaces, the 'GeometricSet' geometry. Styled items adding the style information assigned to the geometric representation items are grouped together with the geometric representation items within the set of Items at IfcShapeRepresentation.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcannotation.htm"
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},
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"IfcAnnotationCurveOccurrence": {
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"description": "Definition from ISO/CD 10303-46:1992: An annotation curve occurrence is a curve with a style assignment. The IfcAnnotationCurveOccurrence shall only be used within a material or paper space dependent representation (note: paper space is not yet supported within this IFC release). Styled curves within model space shall use IfcStyledItem as the instance to link the geometric curve representation item to the (shared) style information. An IfcAnnotationCurveOccurrence is a relation object, that assigns a (set of) styles to a representation item. It can be used without having a geometric representation item already assigned, e.g. within an IfcMaterialDefinitionRepresentation. If it has a geometric representation item already assigned than this is further restricted to be a subtype of IfcCurve. The applicable style information is restricted to be an IfcCurveStyle. For each instance of a styled curve, one instance of IfcAnnotationCurveOccurrence has to be created, that points, via an IfcPresentationStyleAssignment, to an IfcCurveStyle, that can be shared by many styled curves.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationcurveoccurrence.htm"
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},
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"IfcAnnotationFillArea": {
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"attributes": {
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"InnerBoundaries": "A set of inner curves that define the inner boundaries of the fill area. The areas defined by the inner boundaries are excluded from applying the fill area style.",
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"OuterBoundary": "A closed curve that defines the outer boundary of the fill area. The areas defined by the outer boundary (minus potentially defined inner boundaries) is filled by the fill area style."
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},
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"description": "Definition from ISO/CD 10303-46:1992: An annotation fill area is a set of curves that may be filled with hatching, colour or tiling. The annotation fill are is described by boundaries which consist of non-intersecting, non-self-intersecting closed curves. These curves form the boundary of planar areas to be filled according to the style for the annotation fill area. Illustration from ISO 10303-46 The IfcAnnotationFillArea defines an area by a definite OuterBoundary, that might include InnerBoundaries. The areas defined by the InnerBoundaries are excluded from applying the fill area style. Informal Proposition: - Any curve that describes an inner boundary shall not intersect with, nor include, another curve defining an inner boundary. - The curve defining the outer boundary shall not intersect with any curve defining an inner boundary, nor shall it be surrounded by a curve defining an inner boundary.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationfillarea.htm"
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},
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"IfcAnnotationFillAreaOccurrence": {
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"attributes": {
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"FillStyleTarget": "The point that specifies the starting location for the fill area style assigned to the annotation fill area occurrence. Depending on the attribute _GlobalOrLocal_ the point is either given within the world coordinate system of the project or within the object coordinate system of the element or annotation. If the _FillStyleTarget_ is not given, it defaults to 0.,0.",
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"GlobalOrLocal": "The coordinate system in which the _FillStyleTarget_ point is given. Depending on the attribute _GlobalOrLocal_ the point is either given within the world coordinate system of the project or within the object coordinate system of the element or annotation. If not given, the hatch style is directly applied to the parameterization of the geometric representation item, e.g. to the surface coordinate sytem, defined by the surface normal."
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},
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"description": "Definition from ISO/CD 10303-46:1992: An annotation fill area occurrence is a fill area with a style assignment.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationfillareaoccurrence.htm"
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},
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"IfcAnnotationOccurrence": {
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"description": "Definition from ISO/CD 10303-46:1992: The annotation occurrence entity is a geometric representation item which has style for presentation. This entity shall be used for annotation purposes only. The IfcAnnotationOccurrence, and its subtypes, shall only be used within a material or paper space dependent representation (note: paper space is not yet supported within this IFC release). Styled geometric representation items within model space shall use IfcStyledItem as the instance to link geometric representation items to style information.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationoccurrence.htm"
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},
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"IfcAnnotationSurface": {
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"attributes": {
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"Item": "Geometric representation item, providing the geometric definition of the annotated surface. It is further restricted to be a surface, surface model, or solid model.",
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"TextureCoordinates": "Texture coordinates, such as a texture map, that are associated with the textures for the surface style. It should only be given, if the _IfcSurfaceStyle_ associated to the _IfcAnnotationSurfaceOccurrence_ contains an _IfcSurfaceStyleWithTextures_."
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},
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"description": "Definition from IAI: An IfcAnnotationSurface is a surface or solid with texture coordinates assigned. It provides the capabilities to assign - surface shading information, - surface rendering information - surface lighting information - surface textures to a surface, or all surfaces of a face based surface model, a shell based surface model, or a solid model. If the assigned IfcSurfaceStyle defines textures by including an instance of IfcSurfaceStyleWithTextures, the attribute TextureCoordinates determines the mapping of the texture to the surface(s) of the Item. In case of vertex based geometry, texture maps may be used to define the texture coordinates for each face. The style information is linked by using the IfcStyledItem to the IfcAnnotationSurface instance.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationsurface.htm"
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},
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"IfcAnnotationSurfaceOccurrence": {
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"description": "Definition from IAI: The IfcAnnotationSurfaceOccurrence shall only be used within a material or paper space dependent representation (note: paper space is not yet supported within this IFC release). Styled surfaces or solids within model space shall use IfcStyledItem as the instance to link the geometric surface, solid or annotation surface (for texture maps) representation item to the (shared) style information. An IfcAnnotationSurfaceOccurrence is a relation object, that assigns a (set of) styles to a representation item. It can be used without having a geometric representation item already assigned, e.g. within an IfcMaterialDefinitionRepresentation. Each instance of IfcAnnotationSurfaceOccurrence points, via an IfcPresentationStyleAssignment, to an IfcSurfaceStyle, that can be shared by many styled surfaces, or solids.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationsurfaceoccurrence.htm"
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},
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"IfcAnnotationSymbolOccurrence": {
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"description": "Definition from ISO/CD 10303-46:1992: An annotation symbol occurrence is a symbol with a style assignment. The IfcAnnotationSymbolOccurrence_shall only be used within a material or paper space dependent representation (note: paper space is not yet supported within this IFC release). Styled symbols within model space shall use _IfcStyledItem as the instance to link the geometric symbol representation item to the (shared) style information. An IfcAnnotationSymbolOccurrence_is a relation object, that assigns a (set of) styles to a representation item. It can be used without having a geometric representation item already assigned, e.g. within an _IfcMaterialDefinitionRepresentation. If it has a geometric representation item already assigned than this is further restricted to be a subtype of IfcDefinedSymbol. The applicable style information is restricted to be an IfcSymbolStyle. For each instance of a styled symbol, one instance of IfcAnnotationSymbolOccurrence has to be created, that points, via an IfcPresentationStyleAssignment, to an IfcSymbolStyle, that can be shared by many styled symbols.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationsymboloccurrence.htm"
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},
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"IfcAnnotationTextOccurrence": {
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"description": "Definition from ISO/CD 10303-46:1992: An annotation text occurrence is a text with a style assignment.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationtextoccurrence.htm"
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},
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"IfcApplication": {
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"attributes": {
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"ApplicationDeveloper": "Name of the application developer, being requested to be member of the IAI.",
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"ApplicationFullName": "The full name of the application as specified by the application developer.",
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"ApplicationIdentifier": "Short identifying name for the application.",
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"Version": "The version number of this software as specified by the developer of the application."
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},
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"description": "IfcApplication holds the information about an IFC compliant application developed by an application developer who is a member of the IAI. The IfcApplication utilizes a short identifying name as provided by the application developer.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcutilityresource/lexical/ifcapplication.htm"
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},
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"IfcAppliedValue": {
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"attributes": {
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"ApplicableDate": "The date on or from which an applied value is applicable.",
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"AppliedValue": "The extent or quantity or amount of an applied value.",
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"Description": "The description that may apply additional information about a cost (or impact) value. The description may be from purpose generated text, specification libraries, standards etc.",
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"FixedUntilDate": "The date until which applied value is applicable.",
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"IsComponentIn": "The value of the single applied value which is used by the applied value relationship to express a complex applied value.",
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"Name": "A name or additional clarification given to a cost (or impact) value.",
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"UnitBasis": "The number and unit of measure on which the unit cost is based. Note: As well as the normally expected units of measure such as length, area, volume etc., costs may be based on units of measure which need to be defined e.g. sack, drum, pallet, item etc. Unit costs may be based on quantities greater (or lesser) than a unitary value of the basis measure. For instance, timber may have a unit cost rate per X meters where X > 1; similarly for cable, piping and many other items. The basis number may be either an integer or a real value. Note: This attribute should be asserted for all circumstances where the cost to be applied is per unit quantity. It may be asserted even for circumstances where an item price is used, in which case the unit cost basis should be by item (or equivalent definition).",
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"ValueOfComponents": "The total (or subtotal) value of the components within the applied value relationship expressed as a single applied value.",
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"ValuesReferenced": "Pointer to the IfcReferencesCostDocument relationship, which refer to a document from which the cost value is referenced."
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},
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"description": "An IfcAppliedValue is an abstract supertype that specifies the common attributes for cost and environmental values that may be applied to objects within the IFC model. Use Definitions The extent of the IfcAppliedValue is determined by the AppliedValue attribute which may be defined either as an IfcMeasureWithUnit or as an IfcMonetaryMeasure or as an IfcRatioMeasure via the IfcAppliedValueSelect type. Optionally, an IfcAppliedValue may have an applicable date. This is intended to fix the date on which the value became relevant for use. It may be the date on which the value was set in the model or it may be a prior or future date when the value becomes operable. It should be noted that the datatype for IfcAppliedValue.ApplicableDate is IfcDateTimeSelect. This enables either a calendar date or a date and time to be selected. The option of selecting a time only without a date is also possible through this select mechanism but should not be used in the case of an applied value. Similarly, an IfcAppliedValue may have a 'fixed until' date. This is intended to fix the date on which the value ceases to be relevant for use. An instance of IfcAppliedValue may have a unit basis asserted. This is defined as an IfcMeasureWithUnit that determines the extent of the unit value for application purposes. It is assumed that when this attribute is asserted, then the value given to IfcAppliedValue is that for unit quantity. This is not enforced within the IFC schema and thus needs to be controlled within an application.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccostresource/lexical/ifcappliedvalue.htm"
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|
},
|
|
"IfcAppliedValueRelationship": {
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|
"attributes": {
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|
"ArithmeticOperator": "The arithmetic operator applied in an applied value relationship.",
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|
"ComponentOfTotal": "The applied value (total or subtotal) of which the value being considered is a component.",
|
|
"Components": "Applied values that are components of another applied value and from which that applied value may be deduced.",
|
|
"Description": "A description that may apply additional information about an applied value relationship.",
|
|
"Name": "A name used to identify or qualify the applied value relationship."
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|
},
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|
"description": "An IfcAppliedValueRelationship is a relationship class that enables applied values of cost or environmental impact to be aggregated together as components of another applied value. Use Definitions Dependency relationships can exist between applied values on the basis that one particular value may be determined by operations on one or more other values. This is captured through the IfcAppliedValueRelationship entity. In this relationship, one instance of IfcAppliedValue acts as the principal (IfcAppliedValueRelationship.ComponentOf) whose value may be determined from the instances of IfcAppliedValue that are defined as its components (IfcAppliedValueRelationship.Components) An IfcAppliedValueRelationship has an ArithmeticOperator attribute that specifies the form of arithmetical operation implied by the relationship. A practical consideration when using the applied value relationship is that when the arithmetic operator is ADD, then the type of the IfcAppliedValue.AppliedValue attribute will be IfcMeasureWithUnit or IfcMonetaryMeasure while if the arithmetic operator is MULTIPLY, then the type of the IfcAppliedValue.AppliedValue attribute for one instance of IfcAppliedValue will be IfcMeasureWithUnit or IfcMonetaryMeasure while for other instances it will be IfcRatioMeasure. Example A relationship exists between applied value A and applied values B, C and D such that the value of A is determined by the addition of B, C and D such that: A = B + C + D It is possible to develop more complex applied value specifications by creating hierarchies of applied value relationships. In the diagram below, the development of a applied value is shown whereby, because B = E * F and D = G * H * J, then: A = ((E * F) + C + (G * H * J))",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccostresource/lexical/ifcappliedvaluerelationship.htm"
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|
},
|
|
"IfcApproval": {
|
|
"attributes": {
|
|
"Actors": "The set of relationships by which the actors acting in specified roles on this approval are known.",
|
|
"ApprovalDateTime": "Date and time when the result of the approval process is produced.",
|
|
"ApprovalLevel": "Level of the approval e.g. Draft v.s. Completed design.",
|
|
"ApprovalQualifier": "Textual description of special constraints or conditions for the approval.",
|
|
"ApprovalStatus": "The result or current status of the approval, e.g. Requested, Processed, Approved, Not Approved.",
|
|
"Description": "A general textual description of a design, work task, plan, etc. that is being approved for.",
|
|
"Identifier": "A computer interpretable identifier by which the approval is known.",
|
|
"IsRelatedWith": "The set of relationships by which this approval is related to others.",
|
|
"Name": "A human readable name given to an approval.",
|
|
"Relates": "The set of relationships by which other approvals are related to this one."
|
|
},
|
|
"description": "An IfcApproval represents information about approval processes for a plan, a design, a proposal, a change order, etc, in a construction or facilities management project. IfcApproval is referenced by IfcRelAssociatesApproval in IfcControlExtension schema, and thereby can be related to all subtypes of IfcRoot.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcapprovalresource/lexical/ifcapproval.htm"
|
|
},
|
|
"IfcApprovalActorRelationship": {
|
|
"attributes": {
|
|
"Actor": "The reference to the actor who is acting in the given role on the approval specified in this relationship.",
|
|
"Approval": "The approval on which the actor is acting in the role specified in this relationship.",
|
|
"Role": "The role of the actor w.r.t the approval."
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|
},
|
|
"description": "IfcApprovalActorRelationship is used for associating actors to approvals. An actor may be identified as a person or an organization, and may have a specified role in the approval process, e.g. either requesting or giving approval.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcapprovalresource/lexical/ifcapprovalactorrelationship.htm"
|
|
},
|
|
"IfcApprovalPropertyRelationship": {
|
|
"attributes": {
|
|
"Approval": "The approval for the properties selected.",
|
|
"ApprovedProperties": "Properties approved by the approval."
|
|
},
|
|
"description": "IfcApprovalPropertyRelationship is used for associating an approval to properties. A single approval might be given to one or many instances of IfcProperty.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcapprovalresource/lexical/ifcapprovalpropertyrelationship.htm"
|
|
},
|
|
"IfcApprovalRelationship": {
|
|
"attributes": {
|
|
"Description": "Textual description explaining the relationship between approvals.",
|
|
"Name": "The human readable name given to the relationship between the approvals.",
|
|
"RelatedApproval": "The approval that relates to another approval",
|
|
"RelatingApproval": "The approval that other approval is related to."
|
|
},
|
|
"description": "An IfcApprovalRelationship associates two approvals, having e.g. different status or level as approval process or the approved objects evolve.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcapprovalresource/lexical/ifcapprovalrelationship.htm"
|
|
},
|
|
"IfcArbitraryClosedProfileDef": {
|
|
"attributes": {
|
|
"OuterCurve": "Bounded curve, defining the outer boundaries of the arbitrary profile."
|
|
},
|
|
"description": "Definition from IAI: The closed profile IfcArbitraryClosedProfileDef defines an arbitrary two-dimensional profile for the use within the swept surface geometry, the swept area solid or a sectioned spine. It is given by an outer boundary from which the surface or solid can be constructed. Informal proposition: - The OuterCurve has to be a closed curve. - The OuterCurve shall not intersect. Illustration: Table: Definition of arbitrary closed profile definition",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcarbitraryclosedprofiledef.htm"
|
|
},
|
|
"IfcArbitraryOpenProfileDef": {
|
|
"attributes": {
|
|
"Curve": "Open bounded curve defining the profile."
|
|
},
|
|
"description": "Definition from IAI: The open profile IfcArbitraryOpenProfileDef defines an arbitrary two-dimensional open profile for the use within the swept surface geometry. It is given by an open boundary from with the surface can be constructed. Informal proposition: - The Curve has to be an open curve. Illustration: Table: Definition of arbitrary open profile definition",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcarbitraryopenprofiledef.htm"
|
|
},
|
|
"IfcArbitraryProfileDefWithVoids": {
|
|
"attributes": {
|
|
"InnerCurves": "Set of bounded curves, defining the inner boundaries of the arbitrary profile."
|
|
},
|
|
"description": "Definition from IAI: The IfcArbitraryProfileDefWithVoids defines an arbitrary closed two-dimensional profile with holes defined for the use for the swept area solid or a sectioned spine. It is given by an outer boundary and inner boundaries from with the solid the can be constructed. Informal propositions: - The outer curve and all inner curves shall be closed curves. - The outer curve shall enclose all inner curves. - No inner curve shall intersect with the outer curve or any other inner curve. - No inner curve may enclose another inner curve. Illustration: Table: Definition of arbitrary closed profile definition with voids",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcarbitraryprofiledefwithvoids.htm"
|
|
},
|
|
"IfcAsset": {
|
|
"attributes": {
|
|
"AssetID": "A unique identification assigned to an asset that enables its differentiation from other assets. NOTE: The asset identifier is unique within the asset register. It differs from the globally unique id assigned to the instance of an entity populating a database",
|
|
"CurrentValue": "The current cost value of the asset.",
|
|
"DepreciatedValue": "The current value of an asset within the accounting rules and procedures of an organization.",
|
|
"IncorporationDate": "The date on which an asset was incorporated into the works, installed, constructed, erected or completed. NOTE: This is the date on which an asset is considered to start depreciating.",
|
|
"OriginalValue": "The cost value of the asset at the time of purchase.",
|
|
"Owner": "The name of the person or organization that 'owns' the asset.",
|
|
"ResponsiblePerson": "The person designated to be responsible for the asset. NOTE: In (e.g.) UK Law (Health and Safety at Work Act, Electricity at Work Regulations, and others), management of assets must have a person identified as being responsible and to whom regulatory, insurance and other organizations communicate. In places where there is not a legal requirement, the responsible person would be the asset manager but would not have a legal status.",
|
|
"TotalReplacementCost": "The total cost of replacement of the asset.",
|
|
"User": "The name of the person or organization that 'uses' the asset."
|
|
},
|
|
"description": "An IfcAsset is a uniquely identifiable grouping of elements acting as a single entity that has a financial value *Use Definitions* An asset is generally the level of granularity at which maintenance operations are undertaken. An asset is a group that can contain one or more elements. While the value of a component or element can be defined, value is also defined for accounting purposes at the level of the asset. There are a number of actors that can be associated with an asset, each actor having a role. Principal actors are identified as attributes of the class. Additional actors can be specified through the relationship class IfcRelAssignsToActor in which case roles should be defined through the IfcActorRole class which must be asserted for each defined role. There are a number of costs that can be associated with an asset, each cost having a role. Principal costs are identified as attributes of the class. Additional costs can be specified through the relationship class IfcRelAssociatesCost in which case roles must be asserted. Service life data (expected life etc.) can be assigned for one or more assets as IfcServiceLife through the relationship class IfcRelAssignsToControl. The operating function of an asset within an organization may be particularly valuable in situations where one organization provides and maintains core services and another organization adds and maintains terminal services. It can classify who owns and is responsible for the asset. Operating function can be designated through the use of one or more classification notations which will be handled through the relationship class IfcRelAssociatesClassification. *Property Set Use Definition*: The property sets relating to an IfcAsset_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcAsset are part of this IFC release: - Pset_Asset: specific property set for the properties of an asset, if available - Pset_Reliability: specific property set for the properties defining risk that may be associated with an asset or any occurrence of a subtype of IfcProduct, if available - Pset_Risk: specific property set for the properties defining risk that may be associated with an asset or any occurrence of a subtype of IfcObject, if available - Pset_Warranty: specific property set for the properties relating to a warranty or guarantee that may be associated with an asset, any occurrence of IfcProduct or any occurrence of IfcSystem, if available *Geometry Use Definitions* The geometric representation of an IfcAsset is determined by the geometric representations of the products that comprise the asset (since an asset is a subtype of IfcGroup)",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedfacilitieselements/lexical/ifcasset.htm"
|
|
},
|
|
"IfcAsymmetricIShapeProfileDef": {
|
|
"attributes": {
|
|
"CentreOfGravityInY": "Location of centre of gravity along the y axis measured from the center of the bounding box.",
|
|
"TopFlangeFilletRadius": "The fillet between the web and the top flange of the I-shape. If given, the fillet between upper and the lower flanges and the web can be different. If not given, the value of the inherited FilletRadius attribute applies to both, the top and bottom fillet. If the inherited FilletRadius is not given either, no filler is applied.",
|
|
"TopFlangeThickness": "Flange thickness of the top flange of the I-shape. If given, the upper and the lower flanges can have different thicknesses. If not given, the value of the inherited FlangeThickness attribute applies to both, the top and bottom flange thickness.",
|
|
"TopFlangeWidth": "Extent of the top flange, defined parallel to the x axis of the position coordinate system."
|
|
},
|
|
"description": "Definition from IAI: The IfcAsymmetricIShapeProfileDef defines a section profile that provides the defining parameters of an asymmetric I-shaped section to be used by the swept area solid. The bottom flange is always wider than the top flange. Its parameters and orientation relative to the position coordinate system are according to the following illustration. The centre of the position coordinate system is in the profiles centre of the gravity bounding box. The centre of gravity, if given, is located in x direction within the center of the bounding box, and in y-direction along the negative y axis, the offset value is given by the offset parameter CentreOfGravityInY. Illustration: Table: Parameters of asymmetric I-shaped section definition",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcasymmetricishapeprofiledef.htm"
|
|
},
|
|
"IfcAxis1Placement": {
|
|
"attributes": {
|
|
"Axis": "The direction of the local Z axis.",
|
|
"Z": "The normalized direction of the local Z axis. It is either identical with the Axis value, if given, or it defaults to [0.,0.,1.] NVL (IfcNormalise(Axis), IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcDirection([0.0,0.0,1.0]))"
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: The direction and location in three dimensional space of a single axis. An axis1_placement is defined in terms of a locating point (inherited from placement supertype) and an axis direction: this is either the direction of axis or defaults to (0.0,0.0,1.0). The actual direction for the axis placement is given by the derived attribute z (Z). Illustration:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcaxis1placement.htm"
|
|
},
|
|
"IfcAxis2Placement2D": {
|
|
"attributes": {
|
|
"P": "P[1]: The normalized direction of the placement X Axis. This is (1.0,0.0,0.0) if RefDirection is omitted. P[2]: The normalized direction of the placement Y Axis. This is a derived attribute and is orthogonal to P[1]. IfcBuild2Axes(RefDirection)",
|
|
"RefDirection": "The direction used to determine the direction of the local X Axis."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: The location and orientation in two dimensional space of two mutually perpendicular axes. An axis2_placement_2d is defined in terms of a point, (inherited from the placement supertype), and an axis. It can be used to locate and originate an object in two dimensional space and to define a placement coordinate system. The class includes a point which forms the origin of the placement coordinate system. A direction vector is required to complete the definition of the placement coordinate system. The reference direction defines the placement X axis direction, the placement Y axis is derived from this. If the RefDirection attribute is not given, the placement defaults to P[1] (x-axis) as [1.,0.] and P[2] (y-axis) as [0.,1.]. Illustration",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcaxis2placement2d.htm"
|
|
},
|
|
"IfcAxis2Placement3D": {
|
|
"attributes": {
|
|
"Axis": "The exact direction of the local Z Axis.",
|
|
"P": "The normalized directions of the placement X Axis (P[1]) and the placement Y Axis (P[2]) and the placement Z Axis (P[3]). IfcBuildAxes(Axis, RefDirection)",
|
|
"RefDirection": "The direction used to determine the direction of the local X Axis. If necessary an adjustment is made to maintain orthogonality to the Axis direction. If Axis and/or RefDirection is omitted, these directions are taken from the geometric coordinate system."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: The location and orientation in three dimensional space of three mutually perpendicular axes. An axis2_placement_3D is defined in terms of a point (inherited from placement supertype) and two (ideally orthogonal) axes. It can be used to locate and originate an object in three dimensional space and to define a placement coordinate system. The entity includes a point which forms the origin of the placement coordinate system. Two direction vectors are required to complete the definition of the placement coordinate system. The axis is the placement Z axis direction and the ref_direction is an approximation to the placement X axis direction. If the attribute values for Axis and RefDirection are not given, the placement defaults to P[1] (x-axis) as [1.,0.,0.], P[2] (y-axis) as [0.,1.,0.] and P[3] (z-axis) as [0.,0.,1.]. Illustration",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcaxis2placement3d.htm"
|
|
},
|
|
"IfcBSplineCurve": {
|
|
"attributes": {
|
|
"ClosedCurve": "Indication of whether the curve is closed; it is for information only.",
|
|
"ControlPoints": "The array of control points used to define the geometry of the curve. This is derived from the list of control points. IfcListToArray(ControlPointsList,0,UpperIndexOnControlPoints)",
|
|
"ControlPointsList": "The list of control points for the curve.",
|
|
"CurveForm": "Used to identify particular types of curve; it is for information only.",
|
|
"Degree": "The algebraic degree of the basis functions.",
|
|
"SelfIntersect": "Indication whether the curve self-intersects or not; it is for information only.",
|
|
"UpperIndexOnControlPoints": "The upper index on the array of control points; the lower index is 0. This value is derived from the control points list. (SIZEOF(ControlPointsList) - 1)"
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A B-spline curve is a piecewise parametric polynomial or rational curve described in terms of control points and basis functions. The B-spline curve has been selected as the most stable format to represent all types of polynomial or rational parametric curves. With appropriate attribute values it is capable of representing single span or spline curves of explicit polynomial, rational, Bezier or B-spline type. Interpretation of the data is as follows: - All weights shall be positive and the curve is given by k+1 = number of control points Pi = control points wi = weights d = degree The knot array is an array of (k+d+2) real numbers [u-d ... uk+1], such that for all indices j in [-d,k], uj <= uj+1. This array is obtained from the knot data list by repeating each multiple knot according to the multiplicity. N di, the ith normalized B-spline basis function of degree d, is defined on the subset [ui-d, ... , ui+1] of this array. - Let L denote the number of distinct values among the d+k+2 knots in the knot array; L will be referred to as the 'upper index on knots'. Let mj denote the multiplicity (i.e. number of repetitions) of the jth distinct knot. Then All knot multiplicities except the first and the last shall be in the range 1 ... degree; the first and last may have a maximum value of degree + 1. In evaluating the basis functions, a knot u of e.g. multiplicity 3 is interpreted as a string u, u, u, in the knot array. The B-spline curve has 3 special subtypes (IAI note: only 1, Bezier curve, included in this IFC release) where the knots and knot multiplicities are derived to provide simple default capabilities. - Logical flag is provided to indicate whether the curve self intersects or not. Illustration from ISO 10303-42:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcbsplinecurve.htm"
|
|
},
|
|
"IfcBeam": {
|
|
"description": "Definition from ISO 6707-1:1989: Structural member designed to carry loads between or beyond points of support, usually narrow in relation to its length and horizontal or nearly so. An IfcBeam is a horizontal, or nearly horizontal, structural member. It represents such a member from an architectural point of view. It is not required to be load bearing. *Type Use Definition* IfcBeam defines the occurrence of any beam, common information about beam types (or styles) is handled by IfcBeamType. The IfcBeamType (if present) may establish the common type name, usage (or predefined) type, common material layer set, common set of properties and common shape representations (using IfcRepresentationMap). The IfcBeamType is attached using the IfcRelDefinedByType.RelatingType objectified relationship and is accessible by the inverse IsDefinedBy attribute. If no IfcBeamType is attached (i.e. if only occurrence information is given) the predefined type may be given by using the ObjectType attribute. Recommended values are 'beam' (the default), 'brace', 'joist', 'rafter', 'stringer'. *Property Set Use Definition*: The property sets relating to the IfcBeam are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcBeam are part of this IFC release: - Pset_BeamCommon: common property set for all beam occurrences *Material Use Definition* The material of the IfcBeam is defined by the IfcMaterial or IfcMaterialList and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship. Material information can also be given at the IfcBeamType, defining the common attribute data for all occurrences of the same type. It is then accessible by the inverse IsDefinedBy relationship pointing to_IfcBeamType.HasAssociations_ and via IfcRelAssociatesMaterial.RelatingMaterial to IfcMaterial or IfcMaterialList. If both are given, then the material directly assigned to IfcBeam overrides the material assigned to IfcBeamType. *Quantity Use Definition*: The quantities relating to the IfcBeam are defined by the IfcElementQuantity and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following quantities are foreseen, but will be subjected to the local standard of measurement used: *Containment Use Definition* The IfcBeam, as any subtype of IfcBuildingElement, may participate in two different containment relationships. The first (and in most implementation scenarios mandatory) relationship is the hierachical spatial containment, the second (optional) relationship is the aggregation within an element assembly. - The IfcBeam is places within the project spatial hierarchy using the objectified relationship IfcRelContainedInSpatialStructure, referring to it by its inverse attribute SELF\\IfcElement.ContainedInStructure. Subtypes of IfcSpatialStructureElement are valid spatial containers, with IfcBuildingStorey being the default container. - The IfcBeam_may be aggregated into an element assembly using the objectified relationship _IfcRelAggregates, referring to it by its inverse attribute SELF\\IfcObjectDefinition.Decomposes. Any subtype of IfcElement can be an element assembly, with IfcElementAssembly as a special focus subtype. In this case it should not be additionally contained in the project spatial hierarchy, i.e. SELF\\IfcElement.ContainedInStructure_should be _NIL. *Geometry Use Definitions*: The geometric representation of IfcBeam is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The local placement for IfcBeam is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Geometric Representations Currently, the use of 'SweptSolid', 'Clipping' and 'MappedRepresentation' representations is supported. In addition the general representation types 'SurfaceModel', 'Brep', and 'BoundingBox' are allowed. The geometry use definition for 'BoundingBox', 'SurfaceModel' and 'Brep' is explained at IfcBuildingElement. SweptSolid Representation The standard geometric representation of IfcBeam is defined using the 'SweptSolid' representation. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'SweptSolid' The following additional constraints apply to the 'SweptSolid' representation: - Solid: IfcExtrudedAreaSolid shall be supported - Profile: IfcRectangleProfileDef, IfcCircleProfileDef, IfcEllipseProfileDef, and IfcArbitraryClosedProfileDef (including the subtype IfcArbitraryProfileDefWithVoids) shall be supported, in addition the support of basic steel profiles, such as IfcIShapeProfileDef, IfcLShapeProfileDef, IfcUShapeProfileDef, IfcCShapeProfileDef, IfcZShapeProfileDef, and IfcTShapeProfileDef can be agreed. - Extrusion: All extrusion directions shall be supported. Clipping Representation The advanced geometric representation of IfcBeam is defined using the 'Clipping' geometry. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'Clipping' The following constraints apply to the advanced representation: - Solid: see 'SweptSolid' geometric representation - Profile: see 'SweptSolid' geometric representation - Extrusion: see 'SweptSolid' geometric representation - Boolean result: The IfcBooleanClippingResult shall be supported, allowing for Boolean differences between the swept solid (here IfcExtrudedAreaSolid) and one or several IfcHalfSpaceSolid (or its subtypes). MappedRepresentation In addition to the standard and advanced geometric representation of IfcBeam that is defined using the SweptSolid or Clipping geometry, also the MappedRepresentation, shall be supported as it allows for reusing the geometry definition of the beam type at all occurrences of the same type. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'MappedRepresentation' The same constraints, as given for the 'SweptSolid' and 'Clipping' geometric representation, shall apply to the MappedRepresentation of the IfcRepresentationMap.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcbeam.htm"
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},
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"IfcBeamType": {
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"description": "The element type (IfcBeamType) defines a list of commonly shared property set definitions of a beam and an optional set of product representations. It is used to define a beam specification (i.e. the specific product information that is common to all occurrences of that product type). A beam type is used to define the common properties of a certain type of beam that may be applied to many instances of that type to assign a specific style. Beam types may be exchanged without being already assigned to occurrences. The occurrences of the IfcBeamType are represented by instances of IfcBeam.",
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"predefined_types": {
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"BEAM": "A standard beam usually used horizontally.",
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"JOIST": "A beam used to support a floor or ceiling.",
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"LINTEL": "A beam or horizontal piece of material over an opening (e.g. door, window).",
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"NOTDEFINED": "Undefined linear beam element.",
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"T_BEAM": "A beam that forms part of a slab construction and acts together with the slab which its carries. Such beams are often of T-shape (therefore the English name), but may have other shapes as well, e.g. an L-Shape or an Inverted-T-Shape.",
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"USERDEFINED": "User-defined linear beam element."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcbeamtype.htm"
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},
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"IfcBezierCurve": {
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"description": "Definition from ISO/CD 10303-42:1992: This is a special type of curve which can be represented as a type of B-spline curve in which the knots are evenly spaced and have high multiplicities. Suitable default values for the knots and knot multiplicities are derived in this case. A B-spline curve is a piecewise Bezier curve if it is quasi-uniform except that the interior knots have multiplicity degree rather than having multiplicity one. In this subtype the knot spacing is 1.0, starting at 0.0. A piecewise Bezier curve which has only two knots, 0.0 and 1.0, each of multiplicity (degree+1), is a simple Bezier curve.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcbeziercurve.htm"
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},
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"IfcBlobTexture": {
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"attributes": {
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"RasterCode": "Blob, given as a single binary, to capture the texture within one popular file (compression) format.",
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"RasterFormat": "The format of the _RasterCode_ often using a compression."
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},
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"description": "An IfcBlobTexture provides a 2-dimensional distribution of the lighting parameters of a surface onto which it is mapped. The texture itself is given as a single binary, representing the content of a pixel format. The file format of the pixel file is given by the RasterFormat attribute and allowable formats are guided by where rule WR41. For interpretation of the texture nodes see IfcImageTexture definition.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcblobtexture.htm"
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},
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"IfcBlock": {
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"attributes": {
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"XLength": "The size of the block along the placement X axis. It is provided by the inherited axis placement through _SELF\\IfcCsgPrimitive3D.Position.P[1]_.",
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"YLength": "The size of the block along the placement Y axis. It is provided by the inherited axis placement through _SELF\\IfcCsgPrimitive3D.Position.P[2]_.",
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"ZLength": "The size of the block along the placement Z axis. It is provided by the inherited axis placement through _SELF\\IfcCsgPrimitive3D.Position.P[3]_."
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},
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"description": "Definition from ISO/CD 10303-42:1992: A block is a solid rectangular parallelepiped, defined with a location and placement coordinate system. The block is specified by the positive lengths x, y, and z along the axes of the placement coordinate system, and has one vertex at the origin of the placement coordinate system. The inherited Position attribute defines the IfcAxis2Placement3D and provides: - SELF\\IfcCsgPrimitive3D.Position: The location and orientation of the axis system for the primitive. - SELF\\IfcCsgPrimitive3D.Position.Location: The block has one vertex at location and the edges are aligned with the placement axes in the positive sense.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcblock.htm"
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},
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"IfcBoilerType": {
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"description": "The element type IfcBoilerType defines a list of commonly shared property set definitions of a boiler and an optional set of product representations. It is used to define a boiler specification (i.e. the specific product information, that is common to all occurrences of that product type). A boiler type is used to define the common properties of a boiler that may be applied to many occurrences of that type. A boiler is a device which converts stored energy to heat which is added to a fluid; typically used to heat water. Boiler types may be exchanged without being already assigned to occurrences. The occurrences of the IfcBoilerType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_BoilerTypeCommon: common property set for all boiler types Pset_BoilerTypeSteam: property set for steam boiler types",
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"predefined_types": {
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"NOTDEFINED": "Undefined Boiler type.",
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"STEAM": "Steam boiler.",
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"USERDEFINED": "User-defined Boiler type.",
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"WATER": "Water boiler."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcboilertype.htm"
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},
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"IfcBooleanClippingResult": {
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"description": "A clipping result is defined as a special subtype of the general Boolean result (IfcBooleanResult). It constrains the operands and the operator of the Boolean result. A clipping result is the Boolean difference between a solid (restricted to swept area solid) and a half space solid, whereas more than one difference operation can be applied to the Boolean result.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcbooleanclippingresult.htm"
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},
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"IfcBooleanResult": {
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"attributes": {
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"Dim": "The space dimensionality of this entity. It is identical with the space dimensionality of the first operand. A where rule ensures that both operands have the same space dimensionality. FirstOperand.Dim",
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"FirstOperand": "The first operand to be operated upon by the Boolean operation.",
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"Operator": "The Boolean operator used in the operation to create the result.",
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"SecondOperand": "The second operand specified for the operation."
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},
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"description": "Definition from ISO/CD 10303-42:1992: A Boolean result is the result of a regularized operation on two solids to create a new solid. Valid operations are regularized union, regularized intersection, and regularized difference. For purpose of Boolean operations, a solid is considered to be a regularized set of points. The final Boolean result depends upon the operation and the two operands. In the case of the difference operator the order of the operands is also significant. The operator can be either union, intersection or difference. The effect of these operators is described below: - Union on two solids is the new solid that is the regularization of the set of all points that are in either the first operand or the second operand or in both. - Intersection on two solids is the new solid that is the regularization of the set of all points that are in both the first operand and the second operand. - The result of the difference operation on two solids is the regularization of the set of all points which are in the first operand, but not in the second operand.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcbooleanresult.htm"
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},
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"IfcBoundaryCondition": {
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"attributes": {
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"Name": "Optionally defines a name for this boundary condition."
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},
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"description": "Definition from IAI: The abstract entity IfcBoundaryCondition is the supertype of all boundary conditions that can be applied to structural connection definitions, either directly for the connection (e.g. the joint) or for the relation between a structural member and the connection.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcboundarycondition.htm"
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},
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"IfcBoundaryEdgeCondition": {
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"attributes": {
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"LinearStiffnessByLengthX": "Linear stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object.",
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"LinearStiffnessByLengthY": "Linear stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object.",
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"LinearStiffnessByLengthZ": "Linear stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object.",
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"RotationalStiffnessByLengthX": "Rotational stiffness value about the x-axis of the coordinate system defined by the instance which uses this resource object.",
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"RotationalStiffnessByLengthY": "Rotational stiffness value about the y-axis of the coordinate system defined by the instance which uses this resource object.",
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"RotationalStiffnessByLengthZ": "Rotational stiffness value about the z-axis of the coordinate system defined by the instance which uses this resource object."
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},
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"description": "Definition from IAI: The entity IfcBoundaryEdgeCondition describes boundary conditions that can be applied to structural edge connections, either directly for the connection (e.g. the connecting edge) or for the relation between a structural member and the connection.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcboundaryedgecondition.htm"
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},
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"IfcBoundaryFaceCondition": {
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"attributes": {
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"LinearStiffnessByAreaX": "Linear stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object.",
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"LinearStiffnessByAreaY": "Linear stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object.",
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"LinearStiffnessByAreaZ": "Linear stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object."
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},
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"description": "Definition from IAI: The entity IfcBoundaryFaceCondition describes boundary conditions that can be applied to structural face connections, either directly for the connection (e.g. the connecting face) or for the relation between a structural member and the connection. The following conventions to the values of the LinearStiffnessByArea[X,Y,Z] apply: - value (-1.) represents an infinitive large value \u2013 or a fixed connectivity with infinitive stiffness - value zero (0.), represents no stiffness or a free connectivity - any other value represents a finitive stiffness or spring connectivity in that direction or rotation - value NIL ($) represents an unknown connectivity condition",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcboundaryfacecondition.htm"
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},
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"IfcBoundaryNodeCondition": {
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"attributes": {
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"LinearStiffnessX": "Linear stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object.",
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"LinearStiffnessY": "Linear stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object.",
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"LinearStiffnessZ": "Linear stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object.",
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"RotationalStiffnessX": "Rotational stiffness value about the x-axis of the coordinate system defined by the instance which uses this resource object.",
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"RotationalStiffnessY": "Rotational stiffness value about the y-axis of the coordinate system defined by the instance which uses this resource object.",
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"RotationalStiffnessZ": "Rotational stiffness value about the z-axis of the coordinate system defined by the instance which uses this resource object."
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},
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"description": "Definition from IAI: The entity IfcBoundaryNodeCondition describes boundary conditions that can be applied to structural point connections, either directly for the connection (e.g. the joint) or for the relation between a structural member and the connection. The following conventions to the values of the LinearStiffness[X,Y,Z] and RotationalStiffness[X,Y,Z] apply: - value (-1.) represents an infinitely large value \u2013 or a fixed connectivity with infinitive stiffness - value zero (0.), represents no stiffness or a free connectivity - any other value represents a finitive stiffness or spring connectivity in that direction or rotation - value NIL ($) represents an unknown connectivity condition",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcboundarynodecondition.htm"
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},
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"IfcBoundaryNodeConditionWarping": {
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"attributes": {
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"WarpingStiffness": "Defines the warping stiffness value."
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},
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"description": "IfcBoundaryNodeConditionWarping inherits all attributes from IfcBoundaryNodeCondition and includes additionally the possibility to define a value describing the warping stiffness. If a warping stiffness value is needed, an instance of this entity must be used. Otherwise, an instance of IfcBoundaryNodeCondition is adequate.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcboundarynodeconditionwarping.htm"
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},
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"IfcBoundedCurve": {
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"description": "Definition from ISO/CD 10303-42:1992: A bounded curve is a curve of finite arc length with identifiable end points. Informal propositions: - A bounded curve has finite arc length. - A bounded curve has a start point and an end point.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcboundedcurve.htm"
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},
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"IfcBoundedSurface": {
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"description": "Definition from ISO/CD 10303-42:1992: A bounded surface is a surface of finite area with identifiable boundaries. Informal propositions: - A bounded surface has finite non-zero surface area. - A bounded surface has boundary curves.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcboundedsurface.htm"
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},
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"IfcBoundingBox": {
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"attributes": {
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"Corner": "Location of the bottom left corner (having the minimum values).",
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"Dim": "The space dimensionality of this class, it is always 3. 3",
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"XDim": "Length attribute (measured along the edge parallel to the X Axis)",
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"YDim": "Width attribute (measured along the edge parallel to the Y Axis)",
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"ZDim": "Height attribute (measured along the edge parallel to the Z Axis)."
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},
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"description": "Definition from ISO/CD 10303-42:1992: A box domain is an orthogonal box parallel to the axes of the geometric coordinate system which may be used to limit the domain of a half space solid. A box domain is specified by the coordinates of the bottom left corner, and the lengths of the sides measured in the directions of the coordinate axes. Every semantic object having a physical extent might have a minimum default representation of a bounding box. The bounding box is therefore also used as minimal geometric representation for any geometrically represented object. Therefore the IfcBoundingBox is subtyped from IfcGeometricRepresentationItem. Illustration:",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcboundingbox.htm"
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},
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"IfcBoxedHalfSpace": {
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"attributes": {
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"Enclosure": "The box which bounds the half space for computational purposes only."
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},
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"description": "Definition from ISO/CD 10303-42:1992: This entity is a subtype of the half space solid which is trimmed by a surrounding rectangular box. The box has its edges parallel to the coordinate axes of the geometric coordinate system. The IfcBoxedHalfSpace (from ISO 10303-42:1994 boxed_half_space) is used (as its supertype IfcHalfSpaceSolid) only within Boolean operations. It divides the domain into exactly two subsets, where the domain in question is that of the attribute Enclosure. Illustration:",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcboxedhalfspace.htm"
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},
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"IfcBuilding": {
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"attributes": {
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"BuildingAddress": "Address given to the building for postal purposes.",
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"ElevationOfRefHeight": "Elevation above sea level of the reference height used for all storey elevation measures, equals to height 0.0. It is usually the ground floor level.",
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"ElevationOfTerrain": "Elevation above the minimal terrain level around the foot print of the building, given in elevation above sea level."
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},
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"description": "Definition from ISO 6707-1:1989: Construction work that has the provision of shelter for its occupants or contents as one of its main purpose and is normally designed to stand permanently in one place. A building represents a structure that provides shelter for its occupants or contents and stands in one place. The building is also used to provide a basic element within the spatial structure hierarchy for the components of a building project (together with site, storey, and space). A building is (if specified) associated to a site. A building may span over several connected or disconnected buildings. Therefore building complex provides for a collection of buildings included in a site. A building can also be decomposed in (vertical) parts, where each part defines a building section. This is defined by the composition type attribute of the supertype IfcSpatialStructureElements which is interpreted as follow: - COMPLEX = building complex - ELEMENT = building - PARTIAL = building section *Property Set Use Definition*: The property sets relating to the IfcBuilding are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcBuilding are part of this IFC release: - Pset_BuildingCommon: common property set for all types of buildings - Pset_BuildingWaterStorage: specific property set for buildings to capture the water supply requirements - Pset_BuildingUse: specific property set for buildings to capture the current and anticipated real estate context. - Pset_BuildingUseAdjacent: specific property set for buildings to capture the use information about the adjacent buildings. *Quantity Use Definition*: The quantities relating to the IfcBuilding are defined by the IfcElementQuantity and attached by the IfcRelDefinesByProperties. The following quantities are foreseen, but will be subjected to the local standard of measurement: *Spatial Structure Use Definition* The IfcBuilding is used to build the spatial structure of a building (that serves as the primary project breakdown and is required to be hierarchical). The spatial structure elements are linked together by using the objectified relationship IfcRelAggregates. The IfcBuilding references them by its inverse relationships: - IfcBuilding.Decomposes -- referencing (IfcSite || IfcBuilding) by IfcRelAggregates.RelatingObject, If it refers to another instance of IfcBuilding, the referenced IfcBuilding needs to have a different and higher CompositionType, i.e. COMPLEX (if the other IfcBuilding has ELEMENT), or ELEMENT (if the other IfcBuilding has PARTIAL). - IfcBuilding.IsDecomposedBy -- referencing (IfcBuilding || IfcBuildingStorey) by IfcRelAggregates.RelatedObjects. If it refers to another instance of IfcBuilding, the referenced IfcBuilding needs to have a different and lower CompositionType, i.e. ELEMENT (if the other IfcBuilding has COMPLEX), or PARTIAL (if the other IfcBuilding has ELEMENT). If there are building elements and/or other elements directly related to the IfcBuilding (like a curtain wall spanning several stories), they are associated with the IfcBuilding by using the objectified relationship IfcRelContainedInSpatialStructure. The IfcBuilding references them by its inverse relationship: * IfcBuilding.ContainsElements -- referencing any subtype of IfcProduct (with the exception of other spatial structure element) by IfcRelContainedInSpatialStructure.RelatedElements. *Attribute Use Definition*: *Geometry Use Definitions*: The geometric representation of IfcBuilding is given by the IfcProductDefinitionShape and IfcLocalPlacement, allowing multiple geometric representation. Local Placement The local placement for IfcBuilding is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if relative placement is used) to the IfcSpatialStructureElement of type IfcSite, or of type IfcBuilding (e.g. to position a building relative to a building complex, or a building section to a building). - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Geometric Representations Currently, the use of a 2D 'FootPrint' representation of type 'GeometricCurveSet' and a 3D 'Body' representation of type 'Brep' is supported. Foot Print Representation The foot print representation of IfcBuilding is given by either a single 2D curve (such as IfcPolyline or IfcCompositeCurve), or by a list of 2D curves (in case of inner boundaries), if the building has an independent geometric representation. The representation identifier and type of this geometric representation of IfcBuilding is: - IfcShapeRepresentation.RepresentationIdentifier = 'FootPrint' - IfcShapeRepresentation.RepresentationType = 'GeometricCurveSet' Body Representation The body (or solid model) geometric representation (if the building has an independent geometric representation) of IfcBuilding is defined using faceted B-Rep capabilities (with or without voids), based on the IfcFacetedBrep or on the IfcFacetedBrepWithVoids. The representation identifier and type of this representation of IfcBuilding is: - IfcShapeRepresentation.RepresentationIdentifier = 'Body' - IfcShapeRepresentation.RepresentationType = 'Brep' Since the building shape is usually described by the exterior building elements, an independent shape representation shall only be given, if the building is exposed independently from its constituting elements.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcbuilding.htm"
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},
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"IfcBuildingElement": {
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"description": "Definition from ISO 6707-1:1989: Major functional part of a building, examples are foundation, floor, roof, wall. The building element comprises all elements that are primarily part of the construction of a building, i.e., its structural and space separating system. The IfcBuildingElement utilizes the following capabilities mainly through inverse attributes referencing objectified relationships: - Grouping - being part of a logical group of objects objectified relationship: IfcRelAssignsToGroup inverse attribute: HasAssignment - Work processes - reference to work tasks, in which this building element is used objectified relationship: IfcRelAssignsToProcess inverse attribute: HasAssignments - Aggregation - aggregated together with other elements to form an aggregate objectified relationship: IfcRelAggregates inverse attribute (for container): IsDecomposedBy inverse attribute (for contained parts): Decomposes - Material - assignment of material used by this building element objectified relationship: IfcRelAssociatesMaterial inverse attribute: HasAssociations - Classification - assigned reference to an external classification objectified relationship: IfcRelAssociatesClassification inverse attribute: HasAssociations - Documentation - assigned reference to an external documentation objectified relationship: IfcRelAssociatesDocumentation inverse attribute: HasAssociations - Type - reference to the common product type information for the element occurrence objectified relationship: IfcRelDefinesByType inverse attribute: IsDefinedBy - Properties - reference to all attached properties, including quantities objectified relationship: IfcRelDefinesByProperties inverse attribute: IsDefinedBy - Connection - connectivity to other elements, including the definition of the joint objectified relationship: IfcRelConnectsElements inverse attribute: ConnectedTo inverse attribute: ConnectedFrom - Realization - information, whether the building element is used to realize a connection (e.g. as a weld in a connection between two members) objectified relationship: IfcRelConnectsWithRealizingElements inverse attribute: IsConnectionRealization - Ports - information, whether the building element has ports for system connections (note: normally not used, this relationship is inherited from IfcElement and mainly applicable to IfcDistributionElement's) objectified relationship: IfcRelConnectsPortToElement inverse attribute: HasPorts - Assignment to spatial structure - hierarchical assignment to the right level within the spatial structure objectified relationship: IfcRelContainedInSpatialStructure inverse attribute: ContainedInStructure - Reference to spatial structure(s) - non hierarchical reference to one or more elements within the spatial structure (e.g. a curtain wall, being contained in the building, references several stories) objectified relationship: IfcRelContainedInSpatialStructure inverse attribute: ContainedInStructure - Boundary - provision of space boundaries by this building element objectified relationship: IfcRelSpaceBoundary inverse attribute: ProvidesBoundaries - Coverings - assignment of covering elements to this building element (note: normally covering elements are assigned to the space, only used for special cases) objectified relationship: IfcRelCoversBldgElements inverse attribute: HasCoverings - Voids - information, whether the building element includes openings, recesses or other voids objectified relationship: IfcRelVoidsElement inverse attribute: HasOpenings - Projection - information, whether the building element has projections (such as a fascia) objectified relationship: IfcRelProjectsElement inverse attribute: HasProjections - Filling - information whether the building element is used to fill openings objectified relationship: IfcRelFillsElement inverse attribute: FillsVoids - Structural member reference - information whether the building element is represented in a structural analysis model by a structural member objectified relationship: IfcRelConnectsStructuralElement inverse attribute: HasStructuralMember *Quantity Use Definition*: The quantities relating to the IfcBuildingElement are defined by the IfcElementQuantity and attached by the IfcRelDefinesByProperties. A detailed specification for individual quantities is introduced at the level of subtypes of IfcBuildingElement. *Geometry Use Definitions* The geometric representation of any IfcBuildingElement is given by the IfcProductDefinitionShape and IfcLocalPlacement allowing multiple geometric representations. Local Placement The local placement for any IfcBuildingElement is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. Further constraints are defined at the level of its subtypes. Geometric Representations Any IfcBuildingElement can be represented by one or several geometric representations. A detailed specification is introduced at the level of subtypes. Only the general representation types 'BoundingBox', 'SurfaceModel', 'Brep', and 'MappedRepresentation' are defined here. Bounding Box Representation Any IfcBuildingElement may be represented as a bounding box, which shows the maximum extend of the body within the coordinated system established by the IfcLocalPlacement. The bounding box representation is the simplest geometric representation available. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Box' ~~Body~~ - RepresentationType : 'BoundingBox' SurfaceModel Representation Any IfcBuildingElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple surface models, based on either shell or face based models. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'SurfaceModel' In some cases it may be useful to also expose a simple representation as a bounding box representation of the same complex shape. Brep Representation Any IfcBuildingElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple Boundary Representation elements (which are restricted to faceted Brep with or without voids). The Brep representation allows for the representation of complex element shape. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'Brep' In some cases it may be useful to also expose a simple representation as a bounding box representation of the same complex shape. MappedRepresentation Any IfcBuildingElement (so far no further constraints are defined at the level of its subtypes) may be represented using the MappedRepresentation. This shall be supported as it allows for reusing the geometry definition of a type at all occurrences of the same type. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'MappedRepresentation' The same constraints, as given for the 'SurfaceModel' and the 'Brep' geometric representation, shall apply to the MappedRepresentation of the IfcRepresentationMap.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcbuildingelement.htm"
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},
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"IfcBuildingElementComponent": {
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"description": "A building element component represents items included in building elements, which usually are not of interest from the overall building structure viewpoint. Contrary to accessories these components form a significant part of the building elements they belong to and usually have a vital and load carrying function within the structure. Typical examples of _IfcBuildingElementComponent_s include different kinds of reinforcing elements, layers of sandwich wall panels, and plates as parts of structural members. Geometry Use Definitions: The geometric representation of IfcBuildingElementComponent is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The local placement for IfcBuildingElementComponent is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcBuildingElement or IfcElementAssembly, which is used in the Decomposes inverse attribute, i.e. the local placement is defined relative to the local placement of the building element or element assembly in which the component is contained. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. SurfaceModel Representation Any IfcBuildingElementComponent (if no further constraints are defined at the level of its subtypes) may be represented as a single or multiple surface models, based on either shell or face based models. It is ensured by assigning the value 'SurfaceModel' to the RepresentationType attribute of IfcShapeRepresentation. In some cases it may be useful to also expose a simple representation as a bounding box representation of the same complex shape. Brep Representation Any IfcBuildingElementComponent (if no further constraints are defined at the level of its subtypes) may be represented as a single or multiple Boundary Representation elements (which are restricted to faceted Brep with or without voids). The Brep representation allows for the representation of complex element shape. It is ensured by assigning the value 'Brep' to the RepresentationType attribute of IfcShapeRepresentation. In some cases it may be useful to also expose a simple representation as a bounding box representation of the same complex shape. MappedRepresentation The mapped item, IfcMappedItem, should be used if appropriate as it allows for reusing the geometry definition of the equipment type at occurrences of the same equipment type. In this case the IfcShapeRepresentation.RepresentationType = 'MappedRepresentation' is used.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifcbuildingelementcomponent.htm"
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},
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"IfcBuildingElementPart": {
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"description": "Layers or major components as subordinate parts of a building element. Typical usage examples include precast concrete sandwich walls, where the layers may have different geometry representations. In this case the layered material representation does not sufficiently describe the element. Each layer is represented by an own instance of the IfcBuildingElementPart with its own geometry description. General usage The exact type information of the IfcBuildingElementPart is given in the ObjectType attribute inherited from IfcObject. Standard type designations are provided for guideline below. Other object type values may be defined in local agreements. *Property Set Use Definition*: The property sets relating to the IfcBuildingElementPart are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcBuildingElementPart are part of this IFC release: - Pset_ConcreteElementSurfaceFinishQuantityGeneral: common property set for all IfcBuildingElementPart occurrences related to concrete construction. (Note: this is a general property set, which relates to many IFC classes, e.g. subtypes of IfcBuildingElement). - Pset_PrecastConcreteElementGeneral: common property set for all IfcBuildingElementPart occurrences related to precast concrete construction. (Note: this is a general property set, which relates to many IFC classes, e.g. subtypes of IfcBuildingElement). Geometry Use Definitions: The geometric representation of IfcBuildingElementPart is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcBuildingElementComponent. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcBuildingElementComponent.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifcbuildingelementpart.htm"
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},
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"IfcBuildingElementProxy": {
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"attributes": {
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"CompositionType": "Indication, whether the proxy is intended to form an aggregation (COMPLEX), an integral element (ELEMENT), or a part in an aggregation (PARTIAL)."
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},
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"description": "The IfcBuildingElementProxy is a proxy definition that provides the same functionality as an IfcBuildingElement, but without having a defined meaning of the special type of building element, it represents. *Type Use Definition* The IfcBuildingElementProxy defines the occurrence of any building element, common information about the types (or styles) is handled by IfcBuildingElementProxyType. The IfcBuildingElementProxyType (if present) may establish the common type name, usage (or predefined) type, common material, common set of properties and common shape representations (using IfcRepresentationMap). The IfcBuildingElementProxyType is attached using the IfcRelDefinedByType.RelatingType objectified relationship and is accessible by the inverse IsDefinedBy attribute. If no IfcBuildingElementProxyType is attached (i.e. if only occurrence information is given) the predefined type may be given by using the ObjectType attribute. *Property Set Use Definition*: The property sets relating to the IfcBuildingElementProxy are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcBuildingElementProxy/i> are part of this IFC release: - Pset_BuildingElementProxyCommon: common property set for all occurrences of building element proxies. *Geometry Use Definitions* The geometric representation of any IfcBuildingElementProxy is given by the IfcProductDefinitionShape and IfcLocalPlacement allowing multiple geometric representations. The representation types defined at the supertype IfcBuildingElement also apply. Local Placement The local placement for any IfcBuildingElementProxy is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. The local placement can be given relatively. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. *Geometric Representation* Currently, the use of the representation types 'BoundingBox', 'GeometricSet', 'GeometricCurveSet', 'SweptSolid', 'SurfaceModel', 'Brep', and 'MappedRepresentation' are allowed. The geometry use definitions for 'BoundingBox', 'SurfaceModel', 'Brep', and 'MappedRepresentation' are explained at the supertype IfcBuildingElement. GeometricCurveSet Representation Any building element proxy may be represented by a geometric curve set, given by a collection of 2D points and curves. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier: 'FootPrint' - RepresentationType: 'GeometricCurveSet' GeometricSet Representation Any building element proxy may be represented by a geometric set, given by a collection of 2D and 3D points, curves, and surfaces. It represents the body of the proxy object, when no topological structure is available. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier: 'Body' - RepresentationType: 'GeometricSet' Swept Solid Representation Any building element proxy may be represented by swept solid geometry (either by extrusion or by revolution). The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier: 'Body' - RepresentationType: 'SweptSolid' No further restrictions (e.g., for the profile or extrusion direction) are defined at this level. A single or multiple swept area solid(s) can be the Items of the IfcShapeRepresentation.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcbuildingelementproxy.htm"
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},
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"IfcBuildingElementProxyType": {
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"description": "The IfcBuildingElementProxyType defines a list of commonly shared property set definitions of a building element proxy and an optional set of product representations. It is used to define an element specification (i.e. the specific product information, that is common to all occurrences of that product type). A building element proxy type is used to define the common properties of a certain type of a building element proxy that may be applied to many instances of that type to assign a specific style. Building element proxy types may be exchanged without being already assigned to occurrences. The occurrences of the IfcBuildingElementProxyType are represented by instances of IfcBuildingElementProxy.",
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"predefined_types": {
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"NOTDEFINED": "Undefined building element proxy.",
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"USERDEFINED": "User-defined building element proxy."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcbuildingelementproxytype.htm"
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},
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"IfcBuildingElementType": {
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"description": "The element type (IfcBuildingElementType) defines a list of commonly shared property set definitions of a building element and an optional set of product representations. It is used to define an element specification (i.e. the specific product information, that is common to all occurrences of that product type). A building element type is used to define the common properties of a certain type of a building element that may be applied to many instances of that feature type to assign a specific style. Building element types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The IfcBuildingElementType is an abstract type. Occurrences of subtypes of the IfcBuildingElementType are represented by instances of the appropriate subtypes of IfcBuildingElement.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcbuildingelementtype.htm"
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},
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"IfcBuildingStorey": {
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"attributes": {
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"Elevation": "Elevation of the base of this storey, relative to the 0,00 internal reference height of the building. The 0.00 level is given by the absolute above sea level height by the ElevationOfRefHeight attribute given at IfcBuilding."
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},
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"description": "The building storey has an elevation and typically represents a (nearly) horizontal aggregation of spaces that are vertically bound. A storey is (if specified) associated to a building. A storey may span over several connected storeys. Therefore storey complex provides for a collection of storeys included in a building. A storey can also be decomposed in (horizontal) parts, where each part defines a partial storey. This is defined by the composition type attribute of the supertype IfcSpatialStructureElements which is interpreted as follow: - COMPLEX = building storey complex - ELEMENT = building storey - PARTIAL = partial building storey *Property Set Use Definition* The property sets relating to the IfcBuildingStorey are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcBuildingStorey are part of this IFC release: - Pset_BuildingStoreyCommon: common property set for all types of building stories *Quantity Use Definition* The quantities relating to the building storey are defined by the IfcElementQuantity and attached by the IfcRelDefinesByProperties. The following quantities are foreseen, but will be subjected to the local standard of measurement: *Spatial Structure Use Definition* The IfcBuildingStorey is used to build the spatial structure of a building (that serves as the primary project breakdown and is required to be hierarchical). The spatial structure elements are linked together by using the objectified relationship IfcRelAggregates. The _IfcBuildingStorey_references them by its inverse relationships: - IfcBuildingStorey.Decomposes -- referencing (IfcBuilding || IfcBuildingStorey) by IfcRelAggregates.RelatingObject, If it refers to another instance of IfcBuildingStorey, the referenced IfcBuildingStorey needs to have a different and higher CompositionType, i.e. COMPLEX (if the other IfcBuildingStorey has ELEMENT), or ELEMENT (if the other IfcBuildingStorey has PARTIAL). - IfcBuildingStorey.IsDecomposedBy -- referencing (IfcBuildingStorey || IfcSpace) by IfcRelAggregates.RelatedObjects. If it refers to another instance of IfcBuildingStorey, the referenced IfcBuildingStorey needs to have a different and lower CompositionType, i.e. ELEMENT (if the other IfcBuildingStorey has COMPLEX), or PARTIAL (if the other IfcBuildingStorey has ELEMENT). If there are building elements and/or other elements directly related to the IfcBuildingStorey (like most building elements, such as walls, columns, etc.), they are associated with the IfcBuildingStorey by using the objectified relationship IfcRelContainedInSpatialStructure. The IfcBuildingStorey references them by its inverse relationship: * IfcBuildingStorey.ContainsElements -- referencing any subtype of IfcProduct (with the exception of other spatial structure element) by IfcRelContainedInSpatialStructure.RelatedElements. *Geometry Use Definitions* The geometric representation of IfcBuildingStorey is given by the IfcProductDefinitionShape and IfcLocalPlacement, allowing multiple geometric representation. Local Placement The local placement for IfcBuildingStorey is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if relative placement is used) to the IfcSpatialStructureElement of type IfcBuilding, or of type IfcBuildingStorey (e.g. to position a building storey relative to a building storey complex, or a partial building storey to a building storey). - If the relative placement is not used, the absolute placement is defined within the world coordinate system. *Geometric Representations* Currently, the use of a 2D 'FootPrint' representation of type 'GeometricCurveSet' and a 3D 'Body' representation of type 'Brep' is supported. Foot Print Representation The foot print representation of IfcBuildingStorey is given by either a single 2D curve (such as IfcPolyline or IfcCompositeCurve), or by a list of 2D curves (in case of inner boundaries), if the building storey has an independent geometric representation. The representation identifier and type of this geometric representation of IfcBuildingStorey is: - IfcShapeRepresentation.RepresentationIdentifier = 'FootPrint' - IfcShapeRepresentation.RepresentationType = 'GeometricCurveSet' Body Representation The body (or solid model) geometric representation (if the building storey has an independent geometric representation) of IfcBuildingStorey is defined using faceted B-Rep capabilities (with or without voids), based on the IfcFacetedBrep or on the IfcFacetedBrepWithVoids. The representation identifier and type of this representation of IfcBuildingStorey is: - IfcShapeRepresentation.RepresentationIdentifier = 'Body' - IfcShapeRepresentation.RepresentationType = 'Brep' Since the building storey shape is usually described by the exterior building elements, an independent shape representation shall only be given, if the building storey is exposed independently from its constituting elements.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcbuildingstorey.htm"
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},
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"IfcCShapeProfileDef": {
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"attributes": {
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"CentreOfGravityInX": "Location of centre of gravity along the x axis measured from the center of the bounding box.",
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"Depth": "Profile depth, see illustration above (= h).",
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"Girth": "Lengths of girth, see illustration above (= c).",
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"InternalFilletRadius": "Internal fillet radius according the above illustration (= r1). If it is not given, zero is assumed.",
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"WallThickness": "Constant wall thickness of profile (= ts).",
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"Width": "Profile width, see illustration above (= b)."
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},
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"description": "The IfcCShapeProfileDef defines a section profile that provides the defining parameters of a C-shaped section to be used by the swept area solid. This section is typically produced by cold forming steel. Its parameters and orientation relative to the position coordinate system are according to the following illustration.The centre of the position coordinate system is in the profiles centre of the ~~gravity~~ bounding box. The centre of gravity, if given, is located in y direction within the center of the bounding box, and in x-direction along the negative x axis, the offset value is given by the offset parameter CentreOfGravityInX. Illustration: Table: Parameters of C-shape profile definition",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifccshapeprofiledef.htm"
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},
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"IfcCableCarrierFittingType": {
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"description": "An IfcCableCarrierFittingType defines a particular type of cable carrier fitting which is a fitting that is placed at junction or transition in a cable carrier system. *Use Definitions* An IfcCableCarrierFittingType is a subtype of IfcFlowFittingType and provides for all forms of cable carrier fittings. Usage of IfcCableCarrierFittingType defines the parameters for one or more occurrences of IfcFlowFitting. Parameters are specified through property sets that are enumerated in the IfcCableCarrierFittingTypeEnum data type. *Property Set Use Definition*: There are no property sets currently defined for IfcCableCarrierFittingType. *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
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"predefined_types": {
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"BEND": "A fitting that changes the route of the cable carrier.",
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"CROSS": "A fitting at which two branches are taken from the main route of the cable carrier simultaneously.",
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"NOTDEFINED": "Undefined type.",
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"REDUCER": "A fitting that changes the physical size of the main route of the cable carrier.",
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"TEE": "A fitting at which a branch is taken from the main route of the cable carrier.",
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"USERDEFINED": "User-defined type."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifccablecarrierfittingtype.htm"
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},
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"IfcCableCarrierSegmentType": {
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"description": "The IfcCableCarrierSegmentType is a flow segment that is specifically used to carry and support cabling. *Use Definitions* An IfcCableCarrierSegmentType is used to define the common properties of a cable carrier segment that may be applied to many occurrences of that type. A cable carrier segment is used to carry and supports components of a cabling system. Cable carrier segment types may be exchanged without being already assigned to occurrences. The occurrences of the IfcCableCarrierSegmentType are represented by instances of IfcFlowSegment or its subtypes. *Property Set Use Definition:* The property sets relating to the IfcCableCarrierSegmentType are defined by the IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcCableCarrierSegmentType are part of this IFC release: - Pset_CableCarrierSegmentTypeCableLadderSegment: specific property set for the properties of a segment of a cable ladder, if available - Pset_CableCarrierSegmentTypeCableTraySegment: specific property set for the properties of a segment of cable tray, if available - Pset_CableCarrierSegmentTypeCableTrunkingSegment: specific property set for the properties of a segment of cable trunking, if available - Pset_CableCarrierSegmentTypeConduitSegment: : specific property set for the properties of a segment of electrical conduit, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
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"predefined_types": {
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"CABLELADDERSEGMENT": "An open carrier segment on which cables are carried on a ladder structure.",
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"CABLETRAYSEGMENT": "A (typically) open carrier segment onto which cables are laid.",
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"CABLETRUNKINGSEGMENT": "An enclosed carrier segment with one or more compartments into which cables are placed.",
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"CONDUITSEGMENT": "An enclosed tubular carrier segment through which cables are pulled.",
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"NOTDEFINED": "Undefined type.",
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"USERDEFINED": "User-defined type."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifccablecarriersegmenttype.htm"
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},
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"IfcCableSegmentType": {
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"description": "An IfcCableSegmentType is a type of flow segment used to carry electrical power or communications signals. *Use Definitions* A cable segment type is used to define the common properties of a cable segment that may be applied to many occurrences of that type. A cable segment is used to typically join two sections of an electrical network or a network of components carrying the electrical service. Cable segment types may be exchanged without being already assigned to occurrences. The occurrences of the IfcCableSegmentType are represented by instances of IfcFlowSegment or its subtypes. *Property Set Use Definition*: The property sets relating to the IfcCableSegmentType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the _IfcCableSegmentType_are part of this IFC release: - Pset_CableSegmentTypeCableSegment: specific property set for the properties of a whole cable (including the aggregation of conductors within the cable), if available - Pset_CableSegmentTypeConductorSegment: specific property set for the properties of an individual conductor within an electrical cable, if available. *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
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"predefined_types": {
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"CABLESEGMENT": "Cable with a specific purpose to lead electric current within a circuit or any other electric construction. Includes all types of electric cables, mainly several core segments or conductor segments wrapped together.",
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"CONDUCTORSEGMENT": "A single linear element within a cable or an exposed wire (such as for grounding) with the specific purpose to lead electric current, data, or a telecommunications signal.",
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"NOTDEFINED": "Undefined type.",
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"USERDEFINED": "User-defined type."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifccablesegmenttype.htm"
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},
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"IfcCalendarDate": {
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"attributes": {
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"DayComponent": "The day element of the calendar date.",
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"MonthComponent": "The month element of the calendar date.",
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"YearComponent": "The year element of the calendar date."
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},
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"description": "Definition from ISO/CD 10303-41:1992: A date which is defined by a day in a month of a year.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcdatetimeresource/lexical/ifccalendardate.htm"
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},
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"IfcCartesianPoint": {
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"attributes": {
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"Coordinates": "The first, second, and third coordinate of the point location. If placed in a two or three dimensional rectangular Cartesian coordinate system, Coordinates[1] is the X coordinate, Coordinates[2] is the Y coordinate, and Coordinates[3] is the Z coordinate.",
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"Dim": "The space dimensionality of this class, determined by the number of coordinates in the List of Coordinates. HIINDEX(Coordinates)"
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},
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"description": "Definition from ISO/CD 10303-42:1992: A point defined by its coordinates in a two or three dimensional rectangular Cartesian coordinate system, or in a two dimensional parameter space. The entity is defined in a two or three dimensional space. The derived attribute Dim has been added (see also note at IfcGeometricRepresentationItem). The WR1 was added to constrain the usage of IfcCartesianPoint in the context of IFC geometry. For the purpose of defining geometry in IFC only two and three dimensional Cartesian points are used.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccartesianpoint.htm"
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},
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"IfcCartesianTransformationOperator": {
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|
"attributes": {
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|
"Axis1": "The direction used to determine U[1], the derived X axis direction.",
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|
"Axis2": "The direction used to determine U[2], the derived Y axis direction.",
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|
"Dim": "The space dimensionality of this class, determined by the space dimensionality of the local origin. LocalOrigin.Dim",
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|
"LocalOrigin": "The required translation, specified as a cartesian point. The actual translation included in the transformation is from the geometric origin to the local origin.",
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|
"Scale": "The scaling value specified for the transformation.",
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|
"Scl": "The derived scale S of the transformation, equal to scale if that exists, or 1.0 otherwise. NVL(Scale, 1.0)"
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|
},
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|
"description": "Definition from ISO/CD 10303-42:1992: A Cartesian transformation operator defines a geometric transformation composed of translation, rotation, mirroring and uniform scaling. The list of normalized vectors u defines the columns of an orthogonal matrix T. These vectors are computed, by the base axis function, from the direction attributes axis1, axis2 and, in Cartesian transformation operator 3d, axis3. If |T|= -1, the transformation includes mirroring. The local origin point A, the scale value S and the matrix T together define a transformation. The transformation for a point with position vector P is defined by For curves on surface the p curve.reference to curve will be unaffected by any transformation. The Cartesian transformation operator shall only be applied to geometry defined in a consistent system of units with the same units on each axis. With all optional attributes omitted, the transformation defaults to the identity transformation. The Cartesian transformation operator shall only be instantiated as one of its subtypes.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccartesiantransformationoperator.htm"
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},
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|
"IfcCartesianTransformationOperator2D": {
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|
"attributes": {
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|
"U": "The list of mutually orthogonal, normalized vectors defining the transformation matrix T. They are derived from the explicit attributes Axis1 and Axis2 in that order. IfcBaseAxis(2,SELF\\IfcCartesianTransformationOperator.Axis1, SELF\\IfcCartesianTransformationOperator.Axis2,?)"
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},
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|
"description": "Definition from ISO/CD 10303-42:1992: A Cartesian transformation operator 2d defines a geometric transformation in two-dimensional space composed of translation, rotation, mirroring and uniform scaling. The list of normalized vectors u defines the columns of an orthogonal matrix T. These vectors are computed from the direction attributes axis1 and axis2 by the base axis function. If |T|= -1, the transformation includes mirroring.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccartesiantransformationoperator2d.htm"
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},
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|
"IfcCartesianTransformationOperator2DnonUniform": {
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|
"attributes": {
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"Scale2": "The scaling value specified for the transformation along the axis 2. This is normally the y scale factor.",
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"Scl2": "The derived scale S(2) of the transformation along the axis 2 (normally the y axis), equal to Scale2 if that exists, or equal to the derived Scl1 (normally the x axis scale factor) otherwise. NVL(Scale2, SELF\\IfcCartesianTransformationOperator.Scl)"
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},
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"description": "A Cartesian transformation operator 2d non uniform defines a geometric transformation in two-dimensional space composed of translation, rotation, mirroring and non uniform scaling. Non uniform scaling is given by two different scaling factors: - SELF\\IfcCartesianTransformationOperator.Scale: the x axis scale factor - Scale2: the y axis scale factor If the Scale factor (at supertype IfcCartesianTransformationOperator) is omitted, it defaults to 1.0. If the Scale2 factor is omitted, it defaults to the value of Scale (the x axis scale factor).",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccartesiantransformationoperator2dnonuniform.htm"
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},
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"IfcCartesianTransformationOperator3D": {
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"attributes": {
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|
"Axis3": "The exact direction of U[3], the derived Z axis direction.",
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|
"U": "The list of mutually orthogonal, normalized vectors defining the transformation matrix T. They are derived from the explicit attributes Axis3, Axis1, and Axis2 in that order. IfcBaseAxis(3,SELF\\IfcCartesianTransformationOperator.Axis1, SELF\\IfcCartesianTransformationOperator.Axis2,Axis3)"
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|
},
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"description": "Definition from ISO/CD 10303-42:1992: A Cartesian transformation operator 3d defines a geometric transformation in three-dimensional space composed of translation, rotation, mirroring and uniform scaling. The list of normalized vectors u defines the columns of an orthogonal matrix T. These vectors are computed from the direction attributes axis1, axis2 and axis3 by the base axis function. If |T|= -1, the transformation includes mirroring.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccartesiantransformationoperator3d.htm"
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},
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|
"IfcCartesianTransformationOperator3DnonUniform": {
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|
"attributes": {
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"Scale2": "The scaling value specified for the transformation along the axis 2. This is normally the y scale factor.",
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|
"Scale3": "The scaling value specified for the transformation along the axis 3. This is normally the z scale factor.",
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|
"Scl2": "The derived scale S(2) of the transformation along the axis 2 (normally the y axis), equal to Scale2 if that exists, or equal to the derived Scl1 (normally the x axis scale factor) otherwise. NVL(Scale2, SELF\\IfcCartesianTransformationOperator.Scl)",
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|
"Scl3": "The derived scale S(3) of the transformation along the axis 3 (normally the z axis), equal to Scale3 if that exists, or equal to the derived Scl1 (normally the x axis scale factor) otherwise. NVL(Scale3, SELF\\IfcCartesianTransformationOperator.Scl)"
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|
},
|
|
"description": "A Cartesian transformation operator 3d non uniform defines a geometric transformation in three-dimensional space composed of translation, rotation, mirroring and non uniform scaling. Non uniform scaling is given by three different scaling factors: - SELF\\IfcCartesianTransformationOperator.Scale: the x axis scale factor - Scale2: the y axis scale factor - Scale3: the z axis scale factor If the Scale factor (at supertype IfcCartesianTransformationOperator) is omitted, it defaults to 1.0. If the Scale2 or the Scale3 factor is omitted, it defaults to the value of Scale (the x axis scale factor).",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccartesiantransformationoperator3dnonuniform.htm"
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|
},
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|
"IfcCenterLineProfileDef": {
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|
"attributes": {
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|
"Thickness": "Constant thickness applied along the center line."
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|
},
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"description": "The profile IfcCenterLineProfileDef defines an arbitrary two-dimensional open, not self intersecting profile for the use within the swept solid geometry. It is given by an area defined by applying a constant thickness to a centerline, generating an area from which the solid can be constructed. Informal proposition: - The Curve has to be an open curve. - The Curve has to be a non-intersecting curve. Illustration: Table: Definition of center line profile definition",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifccenterlineprofiledef.htm"
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|
},
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|
"IfcChamferEdgeFeature": {
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|
"attributes": {
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|
"Height": "The height of the feature chamfer cross section.",
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|
"Width": "The width of the feature chamfer cross section."
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|
},
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|
"description": "An edge feature with a chamfered cross section shape. Geometry Use Definitions: The geometric representation of IfcChamferEdgeFeature is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined in the supertype IfcFeatureElementSubtraction. Standard Geometric Representation The use of Standard Geometric Representations is defined in the supertype IfcFeatureElementSubtraction.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcchamferedgefeature.htm"
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|
},
|
|
"IfcChillerType": {
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|
"description": "The element type IfcChillerType defines a list of commonly shared property set definitions of a chiller and an optional set of product representations. It is used to define a chiller specification (i.e. the specific product information, that is common to all occurrences of that product type). A chiller type is used to define the common properties of a chiller that may be applied to many occurrences of that type. A chiller is a device used to implement a refrigeration cycle for cooling a fluid, typically water or a mixture of water and glycol. The chilled water is then used to cool and dehumidify air in a building. Chiller types may be exchanged without being already assigned to occurrences. The occurrences of the IfcChillerType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_ChillerTypeCommon: common property set for all chiller types",
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|
"predefined_types": {
|
|
"AIRCOOLED": "Air cooled chiller.",
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|
"HEATRECOVERY": "Heat recovery chiller.",
|
|
"NOTDEFINED": "Undefined chiller type.",
|
|
"USERDEFINED": "User-defined chiller type.",
|
|
"WATERCOOLED": "Water cooled chiller."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcchillertype.htm"
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|
},
|
|
"IfcCircle": {
|
|
"attributes": {
|
|
"Radius": "The radius of the circle, which shall be greater than zero."
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|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: An IfcCircle is defined by a radius and the location and orientation of the circle. Interpretation of data should be as follows: Illustration:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccircle.htm"
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|
},
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|
"IfcCircleHollowProfileDef": {
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|
"attributes": {
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|
"WallThickness": "Thickness of the material, it is the difference between the outer and inner radius."
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|
},
|
|
"description": "Definition from IAI: The IfcCircleHollowProfileDef defines a section profile that provides the defining parameters of a circular hollow section (tube) to be used by the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration.The centre of the position coordinate system is in the profile's centre of the bounding box (for symmetric profiles identical with the centre of gravity). Illustration: Table: Parameters of circular hollow profile definition",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifccirclehollowprofiledef.htm"
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|
},
|
|
"IfcCircleProfileDef": {
|
|
"attributes": {
|
|
"Radius": "The radius of the circle."
|
|
},
|
|
"description": "Definition from IAI: The IfcCircleProfileDef defines a circle as the profile definition used by the swept surface geometry or by the swept area solid. It is given by its Radius attribute and placed within the 2D position coordinate system, established by the Position attribute. Illustration: Table: Parameter for circle profile definition",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifccircleprofiledef.htm"
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|
},
|
|
"IfcClassification": {
|
|
"attributes": {
|
|
"Contains": "Classification items that are classified by the classification.",
|
|
"Edition": "The edition or version of the classification system from which the classification notation is derived.",
|
|
"EditionDate": "The date on which the edition of the classification used became valid. NOTE: The indication of edition may be sufficient to identify the classification source uniquely but the edition date is provided as an optional attribute to enable more precise identification where required.",
|
|
"Name": "The name or label by which the classification used is normally known. NOTE: Examples of names include CI/SfB, Masterformat, BSAB, Uniclass, STABU etc.",
|
|
"Source": "Source (or publisher) for this classification."
|
|
},
|
|
"description": "An IfcClassification is used for the arrangement of objects into a class or category according to a common purpose or their possession of common characteristics. IfcClassification identifies the classification system or source from which a classification notation is derived. The objective is to minimize the number of IfcClassification objects contained within an IFC model. Ideally, each classification system or source used should have only one IfcClassification object. However, because multiple classification is allowed, there may be many IfcClassification objects used, each identifying a different classification system or source.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcclassification.htm"
|
|
},
|
|
"IfcClassificationItem": {
|
|
"attributes": {
|
|
"IsClassifiedItemIn": "Identifies the relationship in which the role of ClassifiedItem is taken.",
|
|
"IsClassifyingItemIn": "Identifies the relationship in which the role of ClassifyingItem is taken.",
|
|
"ItemOf": "The classification that is the source for the uppermost level of the classification item hierarchy used. NOTE: Where a classification item hierarchy is developed within the IFC model, only the uppermost level needs to refer to the classification system or source from which it is derived since all other levels of the hierachy will refer to the source by virtue of their containment by the uppermost level. However, the uppermost level MUST point back to the classification source by virtue of the fact that it is not contained by a higher level classification item.",
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|
"Notation": "The notations from within a classification item that are used within the project. NOTE: In Uniclass this label is called the Code, in UDC it is called the Class Number.",
|
|
"Title": "The name of the classification item. NOTE: Examples of the above attributes from Uniclass: A classification item in Uniclass has a notation \"L6814\" which has the title \"Tanking\". It has a parent notation \"L681\" which has the title \"Proofings, insulation\"."
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|
},
|
|
"description": "An IfcClassificationItem is a class of classification notations used. The term 'classification item' is used in preference to the term 'table' for improved flexibility. For example, the classification item \"L681\" in Uniclass may be used to contain all subsequent notation facets within that class of classifications which has the title \"Proofings, insulation\" (e.g. L6811, L6812, L6813 etc.).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcclassificationitem.htm"
|
|
},
|
|
"IfcClassificationItemRelationship": {
|
|
"attributes": {
|
|
"RelatedItems": "The child level items in a classification structure that are related to the parent level item.",
|
|
"RelatingItem": "The parent level item in a classification structure that is used for relating the child level items."
|
|
},
|
|
"description": "An IfcClassificationItemRelationship is a relationship class that enables the hierarchical structure of a classification system to be exposed through its ability to contain related classification items and to be contained by a relating classification item. IfcClassificationItem's can be progressively decomposed using the IfcClassificationItemRelationship such that the relationship always captures the information about the parent level (relating) item and the child level (related) items of which there can be many. The following example shows how this could be achieved for the Uniclass system. The inverse relationships from IfcClassificationItem to IfcClassificationRelationship enable information about the relationship to be recovered by the items concerned so that they are also aware of the decomposition. The cardinality of the inverse relationship is that an IfcClassificationItem can be the classifying item in only one relationship and can be a classified item in only one relationship. This implies that there is no overlap of IfcClassificationItem's. This reflects typical classification approaches which use strict hierarchical decomposition (or taxonomy) and do not have matrix relationships.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcclassificationitemrelationship.htm"
|
|
},
|
|
"IfcClassificationNotation": {
|
|
"attributes": {
|
|
"NotationFacets": "Alphanumeric characters in defined groups from which the classification notation is derived."
|
|
},
|
|
"description": "An IfcClassificationNotation is a notation used from published reference (which may be either publicly available from a classification society or is published locally for the purposes of an organization, project or other purpose). A classification notation may be developed using various notation facets. A facet is a part of the actual notation but which has a specific meaning. For instance, it may be appropriate to classify an item by owning actor (represented by A=Architect) and by an entry from a classification table such as CI/SfB (represented by 210 for external wall). This gives a classification as A210. All classifications of an object that are contained within the IFC model are made through the IfcClassificationNotation class. For a given object, the IfcRelAssociatesClassification class makes the connection between the IfcObject and the IfcClassificationNotation. It is a requirement that a classification notation can only bring together facets from the same classification system or source. Bringing together notation facets from different sources within the same classification notation is not allowed. However, multiple classifications can be applied to a single object through the use of more than one instance of IfcRelAssociatesClassification. In this way it is possible to define multiple classification notations where each notation contains facets from a single source.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcclassificationnotation.htm"
|
|
},
|
|
"IfcClassificationNotationFacet": {
|
|
"attributes": {
|
|
"NotationValue": "The notation value that specifies the classification e.g. 'L781'"
|
|
},
|
|
"description": "An IfcClassificationNotationFacet is a group of alphanumeric characters used within a classification notation. An IfcClassificationNotationFacet object holds an individual classification value that is to be assigned to an object through IfcClassificationNotation and IfcRelAssociatesClassification objects.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcclassificationnotationfacet.htm"
|
|
},
|
|
"IfcClassificationReference": {
|
|
"attributes": {
|
|
"ReferencedSource": "The classification system or source that is referenced."
|
|
},
|
|
"description": "An IfcClassificationReference is a reference into a classification system or source (see IfcClassification). An optional inherited ItemReference key is also provided to allow more specific references to classification items (or tables) by type. The inherited Name attribute allows for a human interpretable designation of a classification notation (or code) - see use definition of \"Lightweight Classification\". The IfcClassificationReference can be used as a form of 'lightweight' classification through the 'ItemReference' attribute inherited from the abstract IfcExternalReference class. In this case, the 'ItemReference' could take (for instance) the Uniclass notation \"L6814\" which, if the classification was well understood by all parties and was known to be taken from a particular classification source, would be sufficient. The Name attribute could be the title \"Tanking\". This would remove the need for the overhead of the more complete classification structure of the model. However, it is not recommended that this lightweight method be used in cases where more than one classification system is in use or where there may be uncertainty as to the origin or meaning of the classification. Classifications of an object may be referenced from an external source rather than being contained within the IFC model. This is done through the IfcClassificationReference class.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcclassificationreference.htm"
|
|
},
|
|
"IfcClosedShell": {
|
|
"description": "Definition from ISO/CD 10303-42:1992: A closed shell is a shell of the dimensionality 2 which typically serves as a bound for a region in R3. A closed shell has no boundary, and has non-zero finite extent. If the shell has a domain with coordinate space R3, it divides that space into two connected regions, one finite and the other infinite. In this case, the topological normal of the shell is defined as being directed from the finite to the infinite region. The shell is represented by a collection of faces. The domain of the shell, if present, contains all those faces, together with their bounds. Associated with each face in the shell is a logical value which indicates whether the face normal agrees with (TRUE) or is opposed to (FALSE) the shell normal. The logical value can be applied directly as a BOOLEAN attribute of an oriented face, or be defaulted to TRUE if the shell boundary attribute member is a face without the orientation attribute. The combinatorial restrictions on closed shells and geometrical restrictions on their domains are designed to ensure that any domain associated with a closed shell is a closed, orientable manifold. The domain of a closed shell, if present, is a connected, closed, oriented 2-manifold. It is always topologically equivalent to an H-fold torus for some H\u00b3 0. The number H is referred to as the surface genus of the shell. If a shell of genus H has a domain within coordinate space R^3^, then the finite region of space inside it is topologically equivalent to a solid ball with H tunnels drilled through it. The Euler equation (7) applies with B=0, because in this case there are no holes. As in the case of open shells, the surface genus H may not be known a priori, but shall be an integer \u00b3 0. Thus a necessary, but not sufficient, condition for a well-formed closed shell is the following: Informal propositions: - Every edge shall be referenced exactly twice by the loops of the face. - Each oriented edge shall be unique. - No edge shall be referenced by more than two faces. - Distinct faces of the shell do not intersect, but may share edges or vertices. - Distinct edges do not intersect but may share vertices. - Each face reference shall be unique. - The loops of the shell shall not be a mixture of poly loop and other loop types. Note: this is given, since only poly loop is defined as face bound definition. - The closed shell shall be an oriented arcwise connected 2-manifold. - The Euler equation shall be satisfied. Note: Please refer to ISO/IS 10303-42:1994, p.149 for the equation.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcclosedshell.htm"
|
|
},
|
|
"IfcCoilType": {
|
|
"description": "The element type IfcCoilType defines a list of commonly shared property set definitions of a coil and an optional set of product representations. It is used to define a coil specification (i.e. the specific product information, that is common to all occurrences of that product type). A coil type is used to define the common properties of a coil that may be applied to many occurrences of that type. A coil is a device used to provide heat transfer between non-mixing media. A common example is a cooling coil, which utilizes a finned coil in which circulates chilled water, antifreeze, or refrigerant that is used to remove heat from air moving across the surface of the coil. Coil types may be exchanged without being already assigned to occurrences. The occurrences of the IfcCoilType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_CoilTypeCommon: common property set for all coil types Pset_CoilTypeHydronic: property set for hydronic coil types",
|
|
"predefined_types": {
|
|
"DXCOOLINGCOIL": "Cooling coil using a refrigerant to cool the air stream directly.",
|
|
"ELECTRICHEATINGCOIL": "Heating coil using electricity as a heating source.",
|
|
"GASHEATINGCOIL": "Heating coil using gas as a heating source.",
|
|
"NOTDEFINED": "Undefined coil type.",
|
|
"STEAMHEATINGCOIL": "Heating coil using steam as heating source.",
|
|
"USERDEFINED": "User-defined coil type.",
|
|
"WATERCOOLINGCOIL": "Cooling coil using chilled water. HYDRONICCOIL supercedes this enumerator.",
|
|
"WATERHEATINGCOIL": "Heating coil using hot water as a heating source. HYDRONICCOIL supercedes this enumerator."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifccoiltype.htm"
|
|
},
|
|
"IfcColourRgb": {
|
|
"attributes": {
|
|
"Blue": "The intensity of the blue colour component. > NOTE The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual.",
|
|
"Green": "The intensity of the green colour component. > NOTE The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual.",
|
|
"Red": "The intensity of the red colour component. > NOTE The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: A colour rgb as a subtype of colour specifications is defined by three colour component values for red, green, and blue in the RGB colour model.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifccolourrgb.htm"
|
|
},
|
|
"IfcColourSpecification": {
|
|
"attributes": {
|
|
"Name": "Optional name given to a particular colour specification in addition to the colour components (like the RGB values). > NOTE Examples are the names of a industry colour classification, such as RAL."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: The colour specification entity contains a direct colour definition. Colour component values refer directly to a specific colour space.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifccolourspecification.htm"
|
|
},
|
|
"IfcColumn": {
|
|
"description": "Definition from ISO 6707-1:1989: Structural member of slender form, usually vertical, that transmits to its base the forces, primarily in compression, that are applied to it.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifccolumn.htm"
|
|
},
|
|
"IfcColumnType": {
|
|
"description": "The element type (IfcColumnType) defines a list of commonly shared property set definitions of a column and an optional set of product representations. It is used to define a column specification (i.e. the specific product information that is common to all occurrences of that product type). A column type is used to define the common properties of a certain type of column that may be applied to many instances of that type to assign a specific style. Column types may be exchanged without being already assigned to occurrences. The occurrences of the IfcColumnType are represented by instances of IfcColumn.",
|
|
"predefined_types": {
|
|
"COLUMN": "A standard member usually vertical and requiring resistance to vertical forces by compression but also sometimes to lateral forces.",
|
|
"NOTDEFINED": "Undefined linear element.",
|
|
"USERDEFINED": "User-defined linear element."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifccolumntype.htm"
|
|
},
|
|
"IfcComplexProperty": {
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|
"attributes": {
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|
"HasProperties": "Set of properties that can be used within this complex property (may include other complex properties).",
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|
"UsageName": "Usage description of the _IfcComplexProperty_ within the property set which references the _IfcComplexProperty_. > NOTE: Consider a complex property for glazing properties. The Name attribute of the IfcComplexProperty could be Pset_GlazingProperties, and the UsageName attribute could be OuterGlazingPane."
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|
},
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|
"description": "This IfcComplexProperty is used to define complex properties to be handled completely within a property set. The included list may be a mixed or consistent collection of IfcProperty subtypes. This enables the definition of a list of properties to be included as a single 'property' entry in a property set. The definition of such a list can be reused in many different property sets, but the instantiation of such a complex property shall only be used within a single property set.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifccomplexproperty.htm"
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|
},
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|
"IfcCompositeCurve": {
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|
"attributes": {
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|
"ClosedCurve": "Indication whether the curve is closed or not; this is derived from the transition code of the last segment. Segments[NSegments].Transition <> Discontinuous",
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|
"NSegments": "The number of component curves. SIZEOF(Segments)",
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|
"Segments": "The component bounded curves, their transitions and senses. The transition attribute for the last segment defines the transition between the end of the last segment and the start of the first; this transition attribute may take the value discontinuous, which indicates an open curve.",
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|
"SelfIntersect": "Indication of whether the curve intersects itself or not; this is for information only."
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|
},
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|
"description": "Definition from ISO/CD 10303-42:1992: A composite curve (IfcCompositeCurve) is a collection of curves joined end-to-end. The individual segments of the curve are themselves defined as composite curve segments. The parameterization of the composite curve is an accumulation of the parametric ranges of the referenced bounded curves. The first segment is parameterized from 0 to l~1~~, and, for i\u00b3 2, the i^th^^ segment is parameterized from Informal Propositions: - The SameSense attribute of each segment correctly specifies the senses of the component curves. When traversed in the direction indicated by SameSense, the segments shall join end-to-end.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccompositecurve.htm"
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|
},
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|
"IfcCompositeCurveSegment": {
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|
"attributes": {
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|
"Dim": "The space dimensionality of this class, defined by the dimensionality of the first ParentCurve. ParentCurve.Dim",
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|
"ParentCurve": "The bounded curve which defines the geometry of the segment.",
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|
"SameSense": "An indicator of whether or not the sense of the segment agrees with, or opposes, that of the parent curve. If SameSense is false, the point with highest parameter value is taken as the first point of the segment.",
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|
"Transition": "The state of transition (i.e., geometric continuity from the last point of this segment to the first point of the next segment) in a composite curve.",
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|
"UsingCurves": "The set of composite curves which use this composite curve segment as a segment. This set shall not be empty."
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|
},
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|
"description": "Definition from ISO/CD 10303-42:1992: A composite curve segment (IfcCompositeCurveSegment) is a bounded curve together with transition information which is used to construct a composite curve (IfcCompositeCurve). The derived attribute Dim has been added (see also note at IfcGeometricRepresentationItem). The IfcCompositeCurveSegment is a subtype of IfcGeometricRepresentationItem (whereas in STEP P42 composite_curve_segment is not a subtype of geometric_representation_item, the proposed 2nd edition of P42 however proposes the subtype relationship).",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccompositecurvesegment.htm"
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|
},
|
|
"IfcCompositeProfileDef": {
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|
"attributes": {
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|
"Label": "The name by which the composition may be referred to. The actual meaning of the name has to be defined in the context of applications.",
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|
"Profiles": "The profiles which are used to define the composite profile."
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|
},
|
|
"description": "Definition from IAI: The IfcCompositeProfileDef defines the profile by composition of other profiles. The composition is given by a set of at least two other profile definitions. Any profile definition (except for another composite profile) can be used to construct the composite. Illustration: Table: Definition of composite profile definition",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifccompositeprofiledef.htm"
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|
},
|
|
"IfcCompressorType": {
|
|
"description": "The element type IfcCompressorType defines a list of commonly shared property set definitions of a compressor and an optional set of product representations. It is used to define a compressor specification (i.e. the specific product information, that is common to all occurrences of that product type). A compressor type is used to define the common properties of a Compressor that may be applied to many occurrences of that type. A compressor is a device that compresses a fluid typically used in a refrigeration circuit. Compressor types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcCompressorType are represented by instances of IfcFlowMovingDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_CompressorTypeCommon: common property set for all compressor types",
|
|
"predefined_types": {
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|
"BOOSTER": "Positive-displacement reciprocating compressor where pressure is increased by a booster.",
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|
"DYNAMIC": "The pressure of refrigerant vapor is increased by a continuous transfer of angular momentum from a rotating member to the vapor followed by conversion of this momentum into static pressure.",
|
|
"HERMETIC": "Positive-displacement reciprocating compressor where the motor and compressor are contained within the same housing, with the motor shaft integral with the compressor crankshaft and the motor in contact with refrigerant.",
|
|
"NOTDEFINED": "Undefined compressor type.",
|
|
"OPENTYPE": "Positive-displacement reciprocating compressor where the shaft extends through a seal in the crankcase for an external drive.",
|
|
"RECIPROCATING": "Positive-displacement compressor using a piston driven by a connecting rod from a crankshaft.",
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|
"ROLLINGPISTON": "Positive-displacement rotary compressor using a roller mounted on the eccentric of a shaft with a single vane in the nonrotating cylindrical housing.",
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|
"ROTARY": "Positive-displacement compressor using a roller or rotor device.",
|
|
"ROTARYVANE": "Positive-displacement rotary compressor using a roller mounted on the eccentric of a shaft with multiple vanes in the nontotating cylindrical housing.",
|
|
"SCROLL": "Positive-displacement compressor using two inter-fitting, spiral-shaped scroll members.",
|
|
"SEMIHERMETIC": "Positive-displacement reciprocating compressor where the hermetic compressors use bolted construction amenable to field repair.",
|
|
"SINGLESCREW": "Positive-displacement rotary compressor using a single cylindrical main rotor that works with a pair of gate rotors.",
|
|
"SINGLESTAGE": "Positive-displacement reciprocating compressor where vapor is compressed in a single stage.",
|
|
"TROCHOIDAL": "Positive-displacement compressor using a rolling motion of one circle outside or inside the circumference of a basic circle and produce either epitrochoids or hypotrochoids.",
|
|
"TWINSCREW": "Positive-displacement rotary compressor using two mating helically grooved rotors, male (lobes) and female (flutes) in a stationary housing with inlet and outlet gas ports.",
|
|
"USERDEFINED": "User-defined compressor type.",
|
|
"WELDEDSHELLHERMETIC": "Positive-displacement reciprocating compressor where the motor compressor is mounted inside a steel shell, which, in turn is sealed by welding."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifccompressortype.htm"
|
|
},
|
|
"IfcCondenserType": {
|
|
"description": "The element type IfcCondenserType defines a list of commonly shared property set definitions of a condenser and an optional set of product representations. It is used to define a condenser specification (i.e. the specific product information, that is common to all occurrences of that product type). A condenser type is used to define the common properties of a condenser that may be applied to many occurrences of that type. A condenser is a device that is used to dissipate heat, typically by condensing a substance such as a refrigerant from its gaseous to its liquid state. Condenser types may be exchanged without being already assigned to occurrences. The occurrences of the IfcCondenserType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_CondenserTypeCommon: common property set for all condenser types",
|
|
"predefined_types": {
|
|
"AIRCOOLED": "A condenser in which heat is transferred to an air-stream.",
|
|
"EVAPORATIVECOOLED": "A condenser that is cooled evaporatively.",
|
|
"NOTDEFINED": "Undefined condenser type.",
|
|
"USERDEFINED": "User-defined condenser type.",
|
|
"WATERCOOLEDBRAZEDPLATE": "Water-cooled condenser with plates brazed together to form an assembly of separate channels.",
|
|
"WATERCOOLEDSHELLCOIL": "Water-cooled condenser with cooling water circulated through one or more continuous or assembled coils contained within the shell.",
|
|
"WATERCOOLEDSHELLTUBE": "Water-cooled condenser with cooling water circulated through one or more tubes contained within the shell.",
|
|
"WATERCOOLEDTUBEINTUBE": "Water-cooled condenser consisting of one or more assemblies of two tubes, one within the other."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifccondensertype.htm"
|
|
},
|
|
"IfcCondition": {
|
|
"description": "An IfcCondition determines the state or condition of an element at a particular point in time IfcCondition is a particular subtype of IfcGroup that can contain only instances of IfcConditionCriterion. The objectified relationship class IfcRelAssignsToGroup is used to assign the related instances of IfcConditionCriterion to the relating instance of IfcCondition. An IfcCondition is determined either from an observed or a measured state (see IfcConditionCriterion). The condition is determined at a particular point in time, the time being determined through the IfcRelAssociatesDateTime class with an appropriate designation for the value of the DateTimeType e.g. AssessmentDate. Note that other dates may be assigned to IfcCondition for relevant purposes e.g. to recommend the date for the next condition assessment. IfcRelAssignsToProduct is used to relate one or more instances of IfcCondition to an artifact that is an instance of a subtype of IfcProduct. For an instance of IfcAsset, condition is related through the use of IfcRelAssignsToGroup.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifccondition.htm"
|
|
},
|
|
"IfcConditionCriterion": {
|
|
"attributes": {
|
|
"Criterion": "The measured or assessed value of a criterion.",
|
|
"CriterionDateTime": "The time and/or date at which the criterion is determined."
|
|
},
|
|
"description": "An IfcConditionCriterion is a particular measured or assessed criterion that contributes to the overall condition of an artifact. An IfcConditionCriterion may be either an observed/assessed value or a measured value. This is determined by selection through the IfcConditionCriterionSelect type that has a datatype either of IfcLabel (for a numeric or alphanumeric scale observation e.g. on a scale of 1 to 10 where 1 represents 'as new' and 10 represents 'urgent replacement required') or of IfcMeasureWithUnit (for a measured criterion that also includes units of measure). Each criterion must be named and optionally, may also have a description. A description used for a condition should be persistent so that there is absolute consistency in condition recording.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcconditioncriterion.htm"
|
|
},
|
|
"IfcConic": {
|
|
"attributes": {
|
|
"Position": "The location and orientation of the conic. Further details of the interpretation of this attribute are given for the individual subtypes.\""
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A conic (IfcConic) is a planar curve which could be produced by intersecting a plane with a cone. A conic is defined in terms of its intrinsic geometric properties rather than being described in terms of other geometry. A conic class always has a placement coordinate system defined by a two or three dimensional placement. The parametric representation is defined in terms of this placement coordinate system.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcconic.htm"
|
|
},
|
|
"IfcConnectedFaceSet": {
|
|
"attributes": {
|
|
"CfsFaces": "The set of faces arcwise connected along common edges or vertices."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A connected_face_set is a set of faces such that the domain of faces together with their bounding edges and vertices is connected. Informal proposition: - The union of the domains of the faces and their bounding loops shall be arcwise connected.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcconnectedfaceset.htm"
|
|
},
|
|
"IfcConnectionCurveGeometry": {
|
|
"attributes": {
|
|
"CurveOnRelatedElement": "The bounded curve at which the connected objects are aligned at the related element, given in the LCS of the related element. If the information is omitted, then the origin of the related element is used.",
|
|
"CurveOnRelatingElement": "The bounded curve at which the connected objects are aligned at the relating element, given in the LCS of the relating element."
|
|
},
|
|
"description": "The IfcConnectionCurveGeometry is used to describe the geometric constraints that facilitate the physical connection of two objects at a curve or at an edge with curve geometry associated. It is envisioned as a control that applies to the element connection relationships. The available geometry for the connection constraint may be further restricted to only allow straight segments by applying IfcPolyline only. Such an usage constraint is provided at the object definition of the IfcElement subtype, utilizing the element connection by referring to the subtype of IfcRelConnects with the associated IfcConnectionCurveGeometry. *Geometry Use Definitions*: The IfcCurve (or the IfcEdgeCurve with an associated IfcCurve) at the CurveOnRelatingElement attribute defines the curve where the basic geometry items of the connected elements connects. The curve geometry and coordinates are provided within the local coordinate system of the RelatingElement, as specified at the IfcRelConnects_Subtype that utilizes the _IfcConnectionCurveGeometry. Optionally, the same curve geometry and coordinates can also be provided within the local coordinate system of the RelatedElement by using the CurveOnRelatedElement attribute.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcconnectioncurvegeometry.htm"
|
|
},
|
|
"IfcConnectionGeometry": {
|
|
"description": "The IfcConnectionGeometry is used to describe the geometric and topological constraints that facilitate the physical connection of two objects. It is envisioned as a control that applies to the element connection relationships. The IfcConnectionGeometry allows for the provision of connection constraints between geometric and topological elements, the following connection geometry/topology types are in scope: - point | vertex point, - curve | edge curve, - surface | face surface, - profile - NOTE the profile (or port) connection type is deprecated since Release IFC2x Edition 2.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcconnectiongeometry.htm"
|
|
},
|
|
"IfcConnectionPointEccentricity": {
|
|
"attributes": {
|
|
"EccentricityInX": "Distance in x direction between the two points (or vertex points) engaged in the point connection.",
|
|
"EccentricityInY": "Distance in y direction between the two points (or vertex points) engaged in the point connection.",
|
|
"EccentricityInZ": "Distance in z direction between the two points (or vertex points) engaged in the point connection."
|
|
},
|
|
"description": "The IfcConnectionPointEccentricity is used to describe the geometric constraints that facilitate the physical connection of two objects at a point or vertex point with associated point coordinates. There is a physical distance, or eccentricity, between the connection points of both object. The eccentricity can be either given by: - providing the PointOnRelatingElement_and the _PointOnRelatedElement, where both point coordinates are not identical within a common parent coordinate system (latestly within the world coordinate system), - providing the PointOnRelatingElement_and the three distance measures, _EccentricityInX, EccentricityInY, and_EccentricityInZ_(or only EccentricityInX, and EccentricityInY if the underlying coordinate system is two-dimensional), or - providing both. *Geometry Use Definitions*: The IfcPoint (or the IfcVertexPoint with an associated IfcPoint) at the PointOnRelatingElement attribute defines the point where the basic geometry items of the connected elements connects. The point coordinates are provided within the local coordinate system of the RelatingElement, as specified at the IfcRelConnectsSubtype that utilizes the IfcConnectionPointGeometry. Optionally, the same point coordinates can also be provided within the local coordinate system of the RelatedElement by using the PointOnRelatedElement attribute, otherwise the distance to the point at the RelatedElement has to be given by the three eccentricity values.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcconnectionpointeccentricity.htm"
|
|
},
|
|
"IfcConnectionPointGeometry": {
|
|
"attributes": {
|
|
"PointOnRelatedElement": "Point at which connected objects are aligned at the related element, given in the LCS of the related element. If the information is omitted, then the origin of the related element is used.",
|
|
"PointOnRelatingElement": "Point at which the connected object is aligned at the relating element, given in the LCS of the relating element."
|
|
},
|
|
"description": "The IfcConnectionPointGeometry is used to describe the geometric constraints that facilitate the physical connection of two objects at a point (here IfcCartesianPoint) or at an vertex with point coordinates associated. It is envisioned as a control that applies to the element connection relationships. *Geometry Use Definitions*: The IfcPoint (or the IfcVertexPoint with an associated IfcPoint) at the PointOnRelatingElement attribute defines the point where the basic geometry items of the connected elements connects. The point coordinates are provided within the local coordinate system of the RelatingElement, as specified at the IfcRelConnectsSubtype that utilizes the IfcConnectionPointGeometry. Optionally, the same point coordinates can also be provided within the local coordinate system of the RelatedElement by using the PointOnRelatedElement attribute. If both point coordinates are not identical within a common parent coordinate system (latestly within the world coordinate system), the subtype IfcConnectionPointEccentricity shall be used.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcconnectionpointgeometry.htm"
|
|
},
|
|
"IfcConnectionPortGeometry": {
|
|
"attributes": {
|
|
"LocationAtRelatedElement": "Local placement of the port relative to its distribution element's local placement. The element in question is that, which plays the role of the related element in the connectivity relationship.",
|
|
"LocationAtRelatingElement": "Local placement of the port relative to its distribution element's local placement. The element in question is that, which plays the role of the relating element in the connectivity relationship.",
|
|
"ProfileOfPort": "Profile that defines the port connection geometry. It is placed inside the XY plane of the location, given at the relating and (optionally) related distribution element."
|
|
},
|
|
"description": "The IfcConnectionPortGeometry is used to describe the geometric constraints that facilitate the physical connection of two objects at a port having a profile geometry (here IfcProfile). It is envisioned as a control that applies to the element connection relationships. This entity defines the geometric location and configuration of a port on a distribution element. This information can be used to determine how to physically connect distribution elements.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcconnectionportgeometry.htm"
|
|
},
|
|
"IfcConnectionSurfaceGeometry": {
|
|
"attributes": {
|
|
"SurfaceOnRelatedElement": "Surface at which the relating element is aligned at the related element, given in the LCS of the related element. If the information is omitted, then the origin of the related element is used.",
|
|
"SurfaceOnRelatingElement": "Surface at which related object is aligned at the relating element, given in the LCS of the relating element."
|
|
},
|
|
"description": "The IfcConnectionSurfaceGeometry is used to describe the geometric constraints that facilitate the physical connection of two objects at a surface or at a face with surface geometry associated. It is envisioned as a control that applies to the element connection relationships. *Geometry Use Definitions*: The IfcSurface (or the IfcFaceSurface with an associated IfcSurface) at the SurfaceOnRelatingElement attribute defines the surface where the basic geometry items of the connected elements connects. The surface geometry and coordinates are provided within the local coordinate system of the RelatingElement, as specified at the IfcRelConnectsSubtype that utilizes the IfcConnectionSurfaceGeometry. Optionally, the same surface geometry and coordinates can also be provided within the local coordinate system of the RelatedElement by using the SurfaceOnRelatedElement attribute.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcconnectionsurfacegeometry.htm"
|
|
},
|
|
"IfcConstraint": {
|
|
"attributes": {
|
|
"Aggregates": "Reference to the relationships that collect other constraints into this aggregate constraint.",
|
|
"ClassifiedAs": "Reference to the constraint classifications through objectified relationship.",
|
|
"ConstraintGrade": "Enumeration that qualifies the type of constraint.",
|
|
"ConstraintSource": "Any source material, such as a code or standard, from which the constraint originated.",
|
|
"CreatingActor": "Person and/or organization that has created the constraint.",
|
|
"CreationTime": "Time when information specifying the constraint instance was created.",
|
|
"Description": "A description that may apply additional information about a constraint.",
|
|
"IsAggregatedIn": "Reference to the relationships that relate this constraint into aggregate constraints.",
|
|
"IsRelatedWith": "References to the objectified relationships that relate this constraint with other constraints.",
|
|
"Name": "A name to be used for the constraint (e.g., ChillerCoefficientOfPerformance).",
|
|
"PropertiesForConstraint": "Reference to the properties to which the constraint is applied.",
|
|
"RelatesConstraints": "References to the objectified relationships that relate other constraints with this constraint.",
|
|
"UserDefinedGrade": "Allows for specification of user defined grade of the constraint beyond the enumeration values (hard, soft, advisory) provided by ConstraintGrade attribute of type _IfcConstraintEnum_. When a value is provided for attribute UserDefinedGrade in parallel the attribute ConstraintGrade shall have enumeration value USERDEFINED."
|
|
},
|
|
"description": "An IfcConstraint is used to define a constraint or limiting value or boundary condition that may be applied to an object or to the value of a property. IfcConstraint may be associated with any subtype of IfcObject through the IfcRelAssociatesConstraint relationship in the IfcControlExtension schema. A constraint may aggregate other constraints through the IfcConstraintAggregationRelationship through which a logical association between constraints may be applied. A constraint must have a name applied through the IfcConstraint.Name attribute and optionally, a description through IfcConstraint.Description. For instance, when undertaking a move (instantiated through the IfcMove class), a constraint may be named as a 'Move Start Constraint' or 'Move End Constraint' and described using one of a possible range of move constraints as shown in the table below. Application of constraints to moves as indicated by this example replaces the use of IfcActionTimeControl class which is now deleted. The constraint is instantiated as the class IfcMetric and uses a Date/Time value through IfcMetricValue. An appropriate benchmark is applied according to the requirement of the constraint (as indicated). The grade of the constraint (hard, soft, advisory) must be specified through IfcConstraint.ConstraintGrade whilst the time at which the constraint is created may be optionally asserted through IfcConstraint.ConstraintTime.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstraintresource/lexical/ifcconstraint.htm"
|
|
},
|
|
"IfcConstraintAggregationRelationship": {
|
|
"attributes": {
|
|
"Description": "A description that may apply additional information about a constraint aggregation.",
|
|
"LogicalAggregator": "Enumeration that identifies the logical type of aggregation.",
|
|
"Name": "A name used to identify or qualify the constraint aggregation.",
|
|
"RelatedConstraints": "Constraints that are aggregated in using the LogicalAggregator.",
|
|
"RelatingConstraint": "Constraint to which the other Constraints are associated."
|
|
},
|
|
"description": "An IfcConstraintAggregationRelationship is an objectified relationship that enables instances of IfcConstraint and its subtypes to be aggregated together logically. The IfcConstraintAggregationRelationship allows the aggregation link between constraints to be logically defined (AND, OR). In this way, where an object or property has multiple constraints assigned, the linkage between them can be specified. Thus linked constraints might show as (> X AND < Y) which is useful for an allowed range or bounded value or as (A OR B OR C) which is valuable for an enumerated property where a selection is constrained to be one of A, B or C.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstraintresource/lexical/ifcconstraintaggregationrelationship.htm"
|
|
},
|
|
"IfcConstraintClassificationRelationship": {
|
|
"attributes": {
|
|
"ClassifiedConstraint": "Constraint being classified",
|
|
"RelatedClassifications": "Classifications of the constraint."
|
|
},
|
|
"description": "An IfcClassificationConstraintRelationship is an objectified relationship that enables assigning classifications to instances of IfcConstraint and its subtypes.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstraintresource/lexical/ifcconstraintclassificationrelationship.htm"
|
|
},
|
|
"IfcConstraintRelationship": {
|
|
"attributes": {
|
|
"Description": "A description that may apply additional information about the constraint relationship.",
|
|
"Name": "A name used to identify or qualify the constraint relationship.",
|
|
"RelatedConstraints": "Constraints that are related with the RelatingConstraint.",
|
|
"RelatingConstraint": "Constraint with which the other Constraints referenced by attribute RelatedConstraints are related."
|
|
},
|
|
"description": "An IfcConstraintRelationship is an objectified relationship that enables instances of IfcConstraint and its subtypes to be associated to each other.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstraintresource/lexical/ifcconstraintrelationship.htm"
|
|
},
|
|
"IfcConstructionEquipmentResource": {
|
|
"description": "An IfcConstructionEquipmentResource is a type of construction equipment that is used as resource to assist in the performance of construction. Construction Equipment resources are wholly or partially consumed, or occupied (i.e. used) in the performance of construction.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstructionmgmtdomain/lexical/ifcconstructionequipmentresource.htm"
|
|
},
|
|
"IfcConstructionMaterialResource": {
|
|
"attributes": {
|
|
"Suppliers": "Possible suppliers of the type of materials.",
|
|
"UsageRatio": "The ratio of the amount of a construction material used to the amount provided (determined as a quantity)"
|
|
},
|
|
"description": "An IfcConstructionMaterialResource identifies a material resource type in a construction project. Occurrences of IfcConstructionMaterialResource are consumed (wholly or partially), or occupied during a construction work task (i.e. IfcTask). Similar to IfcConstructionProductResource, sometimes things such as 5000kg of gravel are already instantiated as an IfcProduct because it is a result of a work task e.g. \u2018transporting gravel\u2019. In this case, the instance of IfcConstructionMaterialResource can be associated with the product instance \u20185000kg of gravel\u2019 to provide more information for resource uses. Nevertheless, IfcConstructionMaterialResource should only be used to represent resource types, e.g. \u2018gravel\u2019, but not product substances, e.g. \u20185000kg of gravel\u2019. Note: This class is not the same as IfcMaterial; the former can typically represent the type of bulk materials such as sand, gravels, nails and so on (note these can be instantiated from IfcProduct as well depending their uses in the system) used in a construction process. The latter is about physical materials used in a physical building element typically with detailed positioning (e.g. offset) and layering information. The association of an actual material with an IfcConstructionMaterialResource is handled by IfcRelAssociatesMaterial. Quantities for an IfcConstructionMaterialResource are defined through IfcRelDefinesByProperty and use IfcElementQuantity.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstructionmgmtdomain/lexical/ifcconstructionmaterialresource.htm"
|
|
},
|
|
"IfcConstructionProductResource": {
|
|
"description": "An IfcConstructionProductResource defines the role of a product that is consumed (wholly or partially), or occupied (i.e. used) in the performance of construction. Occurrences of products that are used as product resources are instances of IfcProduct (by reference) since they result from some processes. For instance, formworks can be instantiated as products resulting from the process \u2018constructing formwork\u2019. However, they are used as resources in the process \u2018pouring concrete\u2019 in a later stage of the project. The product that is used as a construction resource is referenced using the IfcRelAssignsToResource.RelatedObjects relationship.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstructionmgmtdomain/lexical/ifcconstructionproductresource.htm"
|
|
},
|
|
"IfcConstructionResource": {
|
|
"attributes": {
|
|
"BaseQuantity": "The basic (i.e. default, or recommended) unit that should be used for measuring the volume (or amount) of the resource and the basic quantity of the resource fully or partially consumed.",
|
|
"ResourceConsumption": "A value that indicates how the resource is consumed during its use in a process (see _IfcResourceConsumptionEnum_ for more detail)",
|
|
"ResourceGroup": "The group label, or title of the type resource, e.g. the title of a labour resource as carpenter, crane operator, superintendent, etc.",
|
|
"ResourceIdentifier": "Optional identification of a code or ID for the construction resource"
|
|
},
|
|
"description": "An IfcConstructionResource is an abstract generalization of the different resources used in construction projects, mainly labor, material, equipment and product resources, plus subcontracted resources and aggregations, such as a crew resource.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstructionmgmtdomain/lexical/ifcconstructionresource.htm"
|
|
},
|
|
"IfcContextDependentUnit": {
|
|
"attributes": {
|
|
"Name": "The word, or group of words, by which the context dependent unit is referred to."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-41:1992: A context dependent unit is a unit which is not related to the SI system.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifccontextdependentunit.htm"
|
|
},
|
|
"IfcControl": {
|
|
"attributes": {
|
|
"Controls": "Reference to the relationship that associates the control to the object(s) being controlled."
|
|
},
|
|
"description": "The IfcControl is the abstract generalization of all concepts that control or constrain products or processes in general. It can be seen as a specification, regulation, cost schedule or other requirement applied to a product or process whose requirements and provisions must be fulfilled. Controls are assigned to products, processes, or other objects by using the IfcRelAssignsToControl relationship.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifccontrol.htm"
|
|
},
|
|
"IfcControllerType": {
|
|
"description": "An IfcControllerType defines a particular type of controller that interacts with other devices in a control system such as a building automation control system. *Use Definitions* An IfcControllerType provides for all forms of controller. Usage of IfcControllerType defines the parameters for one or more occurrences of IfcDistributionControlElement. Parameters are specified through property sets that may be enumerated in the IfcControllerTypeEnum data type. An IfcController typically has a relationship with an IfcSensor and/or an IfcActuator. These relationships can be handled either through aggregation (e.g., a unitized controller/actuator assembly) using IfcRelAggregates or simply as an arbitrary grouping of related devices using the IfcRelAssignsToGroup relationship. *Property Set Use Definition*: The property sets relating to the IfcControllerType defined by the IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcControllerType are part of this IFC release: - Pset_ControllerTypeCommon: property set for the properties common to all types of controller, if available - Pset_ControllerTypeProportional: specific property set for the properties of a proportional controller, if available - Pset_ControllerTypeTwoPosition: specific property set for the properties of a two position controller, if available In addition to the above, the following predefined property sets may be used for specification of input/output signal type for controllers: - Pset_AnalogInput: specific property set for the properties of an analog input, if available - Pset_AnalogOutput: specific property set for the properties of an analog output, if available - Pset_BinaryInput: specific property set for the properties of a binary input, if available - Pset_BinaryOutput: specific property set for the properties of a binary output, if available - Pset_MultiStateInput: specific property set for the properties of a multi-state input, if available - Pset_MultiStateOutput: specific property set for the properties of a multi-state output, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"FLOATING": "Output increases or decreases at a constant or accelerating rate.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"PROPORTIONAL": "Output is proportional to the control error and optionally time integral and derivative.",
|
|
"PROPORTIONALINTEGRAL": "",
|
|
"PROPORTIONALINTEGRALDERIVATIVE": "",
|
|
"TIMEDTWOPOSITION": "",
|
|
"TWOPOSITION": "Output can be either on or off.",
|
|
"USERDEFINED": "User-defined type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcbuildingcontrolsdomain/lexical/ifccontrollertype.htm"
|
|
},
|
|
"IfcConversionBasedUnit": {
|
|
"attributes": {
|
|
"ConversionFactor": "The physical quantity from which the converted unit is derived.",
|
|
"Name": "The word, or group of words, by which the conversion based unit is referred to."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-41:1992: A conversion based unit is a unit that is defined based on a measure with unit. An inch is a converted unit. It is from the Imperial system, its name is \"inch\" and it can be related to the si unit, millimetre, through a measure with unit whose value is 25.4 millimetre. A foot is also a converted unit. It is from the Imperial system, its name is \"foot\" and it can be related to an si unit, millimetre, either directly or through the unit called \"inch\". To identify some commonly used conversion based units the standard designations (case insensitive) for the Name attribute include the following:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcconversionbasedunit.htm"
|
|
},
|
|
"IfcCooledBeamType": {
|
|
"description": "The element type IfcCooledBeamType defines a list of commonly shared property set definitions of a cooled beam and an optional set of product representations. It is used to define a cooled beam specification (i.e. the specific product information, that is common to all occurrences of that product type). A cooled beam type is used to define the common properties of a cooled beam that may be applied to many occurrences of that type. A cooled beam is a device typically used to cool air by circulating a fluid such as chilled water through exposed finned tubes above a space. Cooled beam types may be exchanged without being already assigned to occurrences. The occurrences of the IfcCooledBeamType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_CooledBeamTypeCommon: common property set for all cooled beam types Pset_CooledBeamTypeActive: property set for all active or ventilated cooled beam types",
|
|
"predefined_types": {
|
|
"ACTIVE": "An active or ventilated cooled beam provides cooling (and heating) but can also function as an air terminal in a ventilation system.",
|
|
"NOTDEFINED": "Undefined cooled beam type.",
|
|
"PASSIVE": "A passive or static cooled beam provides cooling (and heating) to a room or zone.",
|
|
"USERDEFINED": "User-defined cooled beam type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifccooledbeamtype.htm"
|
|
},
|
|
"IfcCoolingTowerType": {
|
|
"description": "The element type IfcCoolingTowerType defines a list of commonly shared property set definitions of a cooling tower and an optional set of product representations. It is used to define a cooling tower specification (i.e. the specific product information, that is common to all occurrences of that product type). A cooling tower type is used to define the common properties of a cooling tower that may be applied to many occurrences of that type. A cooling tower is a device which rejects heat to ambient air by circulating a fluid such as water through it to reduce its temperature by partial evaporation. Cooling tower types may be exchanged without being already assigned to occurrences. The occurrences of the IfcCoolingTowerType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_CoolingTowerTypeCommon: common property set for all cooling tower types",
|
|
"predefined_types": {
|
|
"MECHANICALFORCEDDRAFT": "Air flow is produced by a mechanical device, typically one or more fans, located on the inlet air side of the cooling tower.",
|
|
"MECHANICALINDUCEDDRAFT": "Air flow is produced by a mechanical device, typically one or more fans, located on the air outlet side of the cooling tower.",
|
|
"NATURALDRAFT": "Air flow is produced naturally.",
|
|
"NOTDEFINED": "Undefined cooling tower type.",
|
|
"USERDEFINED": "User-defined cooling tower type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifccoolingtowertype.htm"
|
|
},
|
|
"IfcCoordinatedUniversalTimeOffset": {
|
|
"attributes": {
|
|
"HourOffset": "The number of hours by which local time is offset from coordinated universal time.",
|
|
"MinuteOffset": "The number of minutes by which local time is offset from coordinated universal time.",
|
|
"Sense": "The direction of the offset. > Note: The data type of the Sense is an enumeration - AHEAD means positive offset; BEHIND means negative offset."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-41:1992: Relates a time to coordinated universal time by an offset (specified in hours and minutes) and direction.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcdatetimeresource/lexical/ifccoordinateduniversaltimeoffset.htm"
|
|
},
|
|
"IfcCostItem": {
|
|
"description": "An IfcCostItem describes a cost or financial value together with descriptive information that describes its context in a form that enables it to be used within a cost schedule. Use Definitions An IfcCostItem can be used to represent the cost of goods and services, the execution of works by a process, lifecycle cost and much more. IfcCostItem brings together the value and currency concepts available through the IfcCostResource schema with the identification, naming and descriptive powers that all non-resource entities in the model inherit from IfcRoot. Each instance of IfcCostItem may have a name and a description. Depending on the use for which the cost is intended, these values should be asserted on the basis of agreement. For instance, the name attribute could be used to provide a common value that enables distinct instances to be brought together in a nesting arrangement (see below) whilst the description attribute could be used to provide the typical text that would be used for item description in a costing schedule. An IfcCostItem can nest other instances of IfcCostItem through its relationships to IfcRelNests. This can be used to enable the development of complex groups of costs as may be found in cost schedules through to pages, sections and complete cost schedules. Instances of IfcCostItem can be assigned to an IfcCostSchedule through the IfcRelSchedulesCostItems relationship class. Instances of IfcCostItem are used for cost estimates, budgets, etc., where a variety of identification codes are used extensively to identify the meaning of the cost. Examples include project phase codes, CSI codes, takeoff sequence numbers, cost accounts, etc. The IFC model allows for all classes that are ultimately subtypes of IfcObject to inherit the ability to have one or more instances of IfcClassificationNotation to be assigned. Where identification codes are required, the generic IFC classification facility should be used.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedmgmtelements/lexical/ifccostitem.htm"
|
|
},
|
|
"IfcCostSchedule": {
|
|
"attributes": {
|
|
"ID": "A unique identification assigned to a cost schedule that enables its differentiation from other cost schedules.",
|
|
"PreparedBy": "The identity of the person or organization preparing the cost schedule.",
|
|
"Status": "The current status of a cost schedule. Examples of status values that might be used for a cost schedule status include: - PLANNED - APPROVED - AGREED - ISSUED - STARTED",
|
|
"SubmittedBy": "The identity of the person or organization submitting the cost schedule.",
|
|
"SubmittedOn": "The date on which the cost schedule was submitted.",
|
|
"TargetUsers": "The actors for whom the cost schedule was prepared.",
|
|
"UpdateDate": "The date that this cost schedule is updated; this allows tracking the schedule history."
|
|
},
|
|
"description": "An IfcCostSchedule brings together instances of IfcCostItem either for the purpose of identifying purely cost information as in an estimate for constructions costs, bill of quantities etc. or for including cost information within another presentation form such as an order (of whatever type) Use Definitions An IfcCostSchedule is ultimately a subtype of IfcRoot and consequently inherits its identifying, naming and description attributes. In addition to the global unique identifier, an IfcCostSchedule may be assigned a specific local unique identifier. The name attribute may be used to give an overall title or name to the IfcCostSchedule. The description attribute may be used to provide further descriptive narrative. This may include specific comments that can be applied. An IfcCostSchedule may be assigned a status that determines its current level of development or agreement. In the case of an 'APPROVED' status, this should only be set after an approval has been given through the association of an instance of IfcApproval. An IfcCostSchedule may also be declared as being of a particular type. A number of predefined types are included through the IfcCostScheduleTypeEnum enumeration.",
|
|
"predefined_types": {
|
|
"BUDGET": "An allocation of money for a particular purpose.",
|
|
"COSTPLAN": "An assessment of the amount of money needing to be expended for a defined purpose based on incomplete information about the goods and services required for a construction or installation.",
|
|
"ESTIMATE": "An assessment of the amount of money needing to be expended for a defined purpose based on actual information about the goods and services required for a construction or installation.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"PRICEDBILLOFQUANTITIES": "A complete listing of all work items forming construction or installation works in which costs have been allocated to work items.",
|
|
"SCHEDULEOFRATES": "A listing of each type of goods forming construction or installation works with the cost of purchase, construction/installation, overheads and profit assigned so that additional items of that type can be costed.",
|
|
"TENDER": "An offer to provide goods and services.",
|
|
"UNPRICEDBILLOFQUANTITIES": "A complete listing of all work items forming construction or installation works in which costs have not yet been allocated to work items.",
|
|
"USERDEFINED": "User-defined type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedmgmtelements/lexical/ifccostschedule.htm"
|
|
},
|
|
"IfcCostValue": {
|
|
"attributes": {
|
|
"Condition": "The condition under which a cost value applies.",
|
|
"CostType": "Specification of the type of cost type used. > NOTE: There are many possible types of cost value that may be identified. Whilst there is a broad understanding of the meaning of names that may be assigned to different types of costs, there is no general standard for naming cost types nor are there any broadly defined classifications. To allow for any type of cost value, the IfcLabel datatype is assigned. In the absence of any well defined standard, it is recommended that local agreements should be made to define allowable and understandable cost value types within a project or region."
|
|
},
|
|
"description": "An IfcCostValue is an amount of money or a value that affects an amount of money. Use Definitions Each instance of IfcCostValue may also have a CostType. There are many possible types of cost value that may be identified. Whilst there is a broad understanding of the meaning of names that may be assigned to different types of costs, there is no general standard for naming cost types nor are there any broadly defined classifications. To allow for any type of cost value, the IfcLabel datatype is assigned. The following defines some cost types that might be applied: In the absence of any well-defined standard, it is recommended that local agreements should be made to define allowable and understandable cost value types within a project or region.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccostresource/lexical/ifccostvalue.htm"
|
|
},
|
|
"IfcCovering": {
|
|
"attributes": {
|
|
"Covers": "Reference to the objectified relationship that handles the relationship of the covering to the covered space.",
|
|
"CoversSpaces": ""
|
|
},
|
|
"description": "Definition from ISO 6707-1:1989: term used: Finishing - final coverings and treatments of surfaces and their intersections. A covering is an element which covers some part of another element and is fully dependent on that other element. The IfcCovering defines the occurrence of a covering type, that (if given) is expressed by the IfcCoveringType. Coverings can be assigned to - a space represented by IfcSpace using the inverse relationship CoversSpaces pointing to IfcRelCoversSpaces. The space is then accessible via IfcRelCoversSpaces.RelatedSpace. - a space boundary represented by IfcRelSpaceBoundary using the inverse relationship ProvidesBoundaries pointing to IfcRelSpaceBoundary. The space is then accessible via IfcRelSpaceBoundary.RelatingSpace. - a building element represented by IfcBuildingElement using the inverse relationship Covers pointing to IfcRelCoversBldgElements. The building element is then accessible via IfcRelCoversBldgElements.RelatingBuildingElement. - a distribution element represented by IfcDistributionElement using the inverse relationship Covers pointing to IfcRelCoversBldgElements. The distribution element is then accessible via IfcRelCoversBldgElements.RelatingBuildingElement. Only IfcCovering's with a PredefinedType INSULATION, MEMBRANE, SLEEVING, or WRAPPING shall be used to cover distribution elements. The following guideline shall apply: - (default) if the space has coverings that may not have an own shape representation and no defined relationships to the building elements they cover, then the IfcCovering shall be assigned to IfcSpace using the IfcRelCoversSpaces relationship, - if the space has coverings that have an own shape representation and the space has defined space boundaries, then the covering, which relates to that space, may be assigned to the space boundaries using the link to IfcRelSpaceBoundary, - if the covering does not relate to a space, then the covering should be assigned to the building element or a distribution element using the IfcRelCoversBldgElements relationship. *Type Use Definition* The IfcCovering defines the occurrence of any covering, common information about covering types (or styles) is handled by IfcCoveringType. The IfcCoveringType (if present) may establish the common type name, usage (or predefined) type, common set of properties, common material layer set, and common shape representations (using IfcRepresentationMap). The IfcCoveringType is attached using the IfcRelDefinedByType.RelatingType objectified relationship and is accessible by the inverse IsDefinedBy attribute. As an additional use agreement for standard coverings (i.e. slabs with constant thickness along the extrusion direction), the IfcCoveringType should have a unique IfcMaterialLayerSet, that is referenced by the IfcMaterialLayerSetUsage assigned to all occurrences of this covering type. If an IfcCoveringType is assigned to the IfcCovering, the attribute PredefinedType shall not be assigned, or shall be identical to IfcCoveringType.PredefinedType. *Property Set Use Definition*: The property sets relating to the IfcCovering are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcCovering are part of this IFC release: - Pset_CoveringCommon: common property set for all covering occurrences Pset_CoveringCeiling: specific property set for all occurrences of coverings with the PredefinedType: CEILING Pset_CoveringFlooring: specific property set for all occurrences of coverings with the PredefinedType: FLOORING *Quantity Use Definition*: The quantities relating to the IfcCovering are defined by the IfcElementQuantity and attached by the IfcRelDefinesByProperties. The following quantities are foreseen, but will be subjected to the local standard of measurement: *Geometry Use Definitions* The geometric representation of IfcCovering is given by the IfcProductDefinitionShape, allowing multiple geometric representation. Included are: Local Placement The local placement for IfcCovering is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the same IfcSpatialStructureElement , which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. - If the IfcCovering, however, is assigned to an IfcBuildingElement, and this element defines its own local placement, than the PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the IfcBuildingElement. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Geometric Representations The geometric representation of the IfcCovering depends on two criteria: - Does it define an area or a volume? - Is the base surface (either the IfcRelSpaceBoundary or the surface of the IfcBuildingElement it relates to) a planar surface or a cylindrical surface? GeometricSet Representation The 'GeometricSet' geometric representation of IfcCovering supports area definitions as 3D surfaces. - RepresentationIdentifier : 'Surface' - RepresentationType : 'GeometricSet' The following additional constraints apply to the 'GeometricSet' representation of IfcCovering: - for planar base surfaces - bounded surface representation - for cylindrical base surfaces - swept surface representation SweptSolid Representation The 'SweptSolid' geometric representation of IfcCovering supports volume definitions as 3D solids. - RepresentationIdentifier : 'Body' - RepresentationType : 'SweptSolid' The following additional constraints apply to the 'SweptSolid' representation of IfcCovering: - for planar base surfaces - swept area representation - for cylindrical base surfaces - swept area representation",
|
|
"predefined_types": {
|
|
"CEILING": "The covering is used torepresent a ceiling.",
|
|
"CLADDING": "The covering is used to represent a cladding.",
|
|
"FLOORING": "The covering is used to represent a flooring.",
|
|
"INSULATION": "The covering is used to insulate an element for thermal or acoustic purposes.",
|
|
"MEMBRANE": "An impervious layer that could be used for e.g. roof covering (below tiling - that may be known as sarking etc.) or as a damp proof course membrane.",
|
|
"NOTDEFINED": "Undefined type of covering.",
|
|
"ROOFING": "The covering is used to represent a roof covering.",
|
|
"SLEEVING": "The covering is used to isolate a distribution element from a space in which it is contained.",
|
|
"USERDEFINED": "User defined type of covering.",
|
|
"WRAPPING": "The covering is used for wrapping particularly of distribution elements using tape."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifccovering.htm"
|
|
},
|
|
"IfcCoveringType": {
|
|
"description": "The IfcCoveringType defines a list of commonly shared property set definitions of an element and an optional set of product representations. It is used to define an element specification (i.e. the specific product information, that is common to all occurrences of that product type). A covering type is used to define the common properties of a certain type of a covering that may be applied to many instances of that type to assign a specific style. Covering types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcCoveringType are represented by instances of IfcCovering (or its subtypes). Informal proposition - The material assignment, if provided using the IfcRelAssociatesMaterial relationship, shall not reference the IfcMaterialLayerSetUsage.",
|
|
"predefined_types": {
|
|
"CEILING": "The covering is used torepresent a ceiling.",
|
|
"CLADDING": "The covering is used to represent a cladding.",
|
|
"FLOORING": "The covering is used to represent a flooring.",
|
|
"INSULATION": "The covering is used to insulate an element for thermal or acoustic purposes.",
|
|
"MEMBRANE": "An impervious layer that could be used for e.g. roof covering (below tiling - that may be known as sarking etc.) or as a damp proof course membrane.",
|
|
"NOTDEFINED": "Undefined type of covering.",
|
|
"ROOFING": "The covering is used to represent a roof covering.",
|
|
"SLEEVING": "The covering is used to isolate a distribution element from a space in which it is contained.",
|
|
"USERDEFINED": "User defined type of covering.",
|
|
"WRAPPING": "The covering is used for wrapping particularly of distribution elements using tape."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifccoveringtype.htm"
|
|
},
|
|
"IfcCraneRailAShapeProfileDef": {
|
|
"attributes": {
|
|
"BaseDepth1": "Base depth of the A shape crane rail, see illustration above (= s1).",
|
|
"BaseDepth2": "Base depth of the A shape crane rail, see illustration above (= s2).",
|
|
"BaseDepth3": "Depth of the base where thickness changes, see illustration above (= s3).",
|
|
"BaseWidth2": "Total extent of the width of the base, defined parallel to the x axis of the position coordinate system. See illustration above (= b2).",
|
|
"BaseWidth4": "Width of the base where thickness changes, defined parallel to the x axis of the position coordinate system. See illustration above (= b4).",
|
|
"CentreOfGravityInY": "Location of centre of gravity along the y axis measured from the center of the bounding box.",
|
|
"HeadDepth2": "Head depth of the A shape crane rail, see illustration above (= h2).",
|
|
"HeadDepth3": "Head depth of the A shape crane rail, see illustration above (= h3).",
|
|
"HeadWidth": "Total extent of the width of the head, defined parallel to the x axis of the position coordinate system. See illustration above (= b1).",
|
|
"OverallHeight": "Total extent of the height, defined parallel to the y axis of the position coordinate system. See illustration above (= h1).",
|
|
"Radius": "Edge radius according the above illustration (= r1).",
|
|
"WebThickness": "Thickness of the web of the A shape crane rail. See illustration above (= b3)."
|
|
},
|
|
"description": "Definition from IAI: The IfcCraneRailAShapeProfileDef defines a section profile that provides the defining parameters of a crane rail to be used by the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration. The centre of the position coordinate system is in the profiles centre of the ~~gravity~~ bounding box. The centre of gravity, if given, is located in x direction within the center of the bounding box, and in y-direction along the negative y axis, the offset value is given by the offset parameter CentreOfGravityInY. Illustration: Table: Parameters of crane rail A shape",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifccranerailashapeprofiledef.htm"
|
|
},
|
|
"IfcCraneRailFShapeProfileDef": {
|
|
"attributes": {
|
|
"BaseDepth1": "Base depth of the F shape crane rail, see illustration above (= s1).",
|
|
"BaseDepth2": "Base depth of the F shape crane rail, see illustration above (= s2).",
|
|
"CentreOfGravityInY": "Location of centre of gravity along the y axis measured from the center of the bounding box.",
|
|
"HeadDepth2": "Head depth of the F shape crane rail, see illustration above (= h2).",
|
|
"HeadDepth3": "Head depth of the F shape crane rail, see illustration above (= h3).",
|
|
"HeadWidth": "Total extent of the width of the head, defined parallel to the x axis of the position coordinate system. See illustration above (= k)",
|
|
"OverallHeight": "Total extent of the height, defined parallel to the y axis of the position coordinate system. See illustration above (= h1).",
|
|
"Radius": "Edge radius according the above illustration (= r1).",
|
|
"WebThickness": "Thickness of the web of the F shape crane rail. See illustration above (= b3)"
|
|
},
|
|
"description": "Definition from IAI: The IfcCraneRailFShapeProfileDef defines a section profile that provides the defining parameters of a crane rail to be used by the swept surface geometry or the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration. The centre of the position coordinate system is in the profiles centre of the ~~gravity~~ bounding box. The centre of gravity, if given, is located in x direction within the center of the bounding box, and in y-direction along the positive y axis, the offset value is given by the offset parameter CentreOfGravityInY. Illustration: Table: Parameters of crane rail F shape.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifccranerailfshapeprofiledef.htm"
|
|
},
|
|
"IfcCrewResource": {
|
|
"description": "An IfcCrewResource represents a type of resource used in construction processes, i.e. construction crew resource. A construction crew resource typically includes labor resource, equipment resource, material resource, subcontractor resource, as well as other crew resources. Construction crew resources are partially or wholly consumed, or occupied in a construction process (i.e. IfcTask). Since IfcCrewResource represents the resource types, individual persons are not required to be identified and linked to the crew resource, while they can be associated if needed. The IfcCrewResource is enabled to contain other crew resource types (i.e. crew resource type nesting) through its relationship to IfcRelNests.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstructionmgmtdomain/lexical/ifccrewresource.htm"
|
|
},
|
|
"IfcCsgPrimitive3D": {
|
|
"attributes": {
|
|
"Dim": "The space dimensionality of this geometric representation item, it is always 3. 3",
|
|
"Position": "The placement coordinate system to which the parameters of each individual CSG primitive apply."
|
|
},
|
|
"description": "Definition from IAI: Abstract supertype of all three dimensional primitives used as either tree root item, or as Boolean results within an CSG solid model. All 3D CSG primitives are defined within an three-dimensional placement coordinate system,.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifccsgprimitive3d.htm"
|
|
},
|
|
"IfcCsgSolid": {
|
|
"attributes": {
|
|
"TreeRootExpression": "Boolean expression of regularized operators describing the solid. The root of the tree of Boolean expressions is given explicitly as an IfcBooleanResult (the only item in the Select IfcCsgSelect)."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A solid represented as a CSG model is defined by a collection of so-called primitive solids, combined using regularized Boolean operations. The allowed operations are intersection, union, and difference. As a special case a CSG solid can also consists of a single CSG primitive. - A CSG solid requires two kinds of information for its complete definition: geometric and structural. The geometric information is conveyed by solid models. These typically primitive volumes such as cylinders, wedges and extrusions, but can include general B-Rep models. There can also be solid replicas (not in current IFC release) and half space solids. - The structural information is in a tree (strictly an acyclic directed graph) of Boolean result and CSG solids, which represent a \u2018recipe\u2019 for building the solid. The terminal nodes are the geometric primitives and other solids. Every CSG solid has precisely one Boolean result associated with it which is the root of the tree that defines the solid. (There may be further Boolean results within the tree as operands). The significance of a CSG solid entity is that the solid defined by the associated tree is thus identified as a significant object itself, and in this way it is distinguished from other Boolean result entities representing intermediate results during the construction process. The following primitive volumes can be parts of the CSG tree: solid models, i.e. faceted B-Rep (IfcFacetedBrep, IfcFacetedBrepWithVoids), swept area solid (IfcExtrudedAreaSolid, IfcRevolvedAreaSolid, IfcSurfaceCurveSweptAreaSolid), swept disk solids (IfcSweptDiskSolid) and half space solids (_IfcHalfSpaceSolid_and subtypes). CSG primitives are out of scope for current IFC Release.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifccsgsolid.htm"
|
|
},
|
|
"IfcCurrencyRelationship": {
|
|
"attributes": {
|
|
"ExchangeRate": "The currently agreed ratio of the amount of a related monetary unit that is equivalent to a unit amount of the relating monetary unit in a currency relationship. For instance, in the case of a conversion from GBP to USD, the value of the exchange rate may be 1.486 (USD) : 1 (GBP).",
|
|
"RateDateTime": "The date and time at which an exchange rate applies.",
|
|
"RateSource": "The source from which an exchange rate is obtained.",
|
|
"RelatedMonetaryUnit": "The monetary unit to which an exchange results. For instance, in the case of a conversion from GBP to USD, the related monetary unit is USD.",
|
|
"RelatingMonetaryUnit": "The monetary unit from which an exchange is derived. For instance, in the case of a conversion from GBP to USD, the relating monetary unit is GBP."
|
|
},
|
|
"description": "An IfcCurrencyRelationship defines the rate of exchange that applies between two designated currencies at a particular time and as published by a particular source. An IfcCurrencyRelationship is used where there may be a need to reference an IfcCostValue in one currency to an IfcCostValue in another currency. It takes account of fact that currency exchange rates may vary by requiring the recording the date and time of the currency exchange rate used and the source that publishes the rate. There may be many sources and there are different strategies for currency conversion (spot rate, forward buying of currency at a fixed rate). The source for the currency exchange is defined as an instance of IfcLibraryInformation that includes a name and a location (typically a URL, since most rates are now published in reliable sources via the web, although it may be a string value defining a location of any type).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccostresource/lexical/ifccurrencyrelationship.htm"
|
|
},
|
|
"IfcCurtainWall": {
|
|
"description": "Definition from ISO 6707-1:1989: Non load bearing wall positioned on the outside of a building and enclosing it. Definition of IAI: Exterior wall of a building which is an assembly of components, hung from the edge of the floor/roof structure rather than bearing on a floor. Curtain wall is represented as a building element assembly and implemented as a subtype of IfcBuildingElement that uses an IfcRelAggregates relationship. *Property Set Use Definition*: The property sets relating to the IfcCurtainWall are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcCurtainWall are part of this IFC release: - Pset_CurtainWallCommon: common property set for all curtain wall occurrences *Geometry Use Definitions*: The geometric representation of IfcCurtainWall is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Independent geometric representations, as described below, should only be used when the IfcCurtainWall is not defined as an aggregate. If defined as an aggregate, the geometric representation is the sum of the representations of the components within the aggregate. Local placement The local placement for IfcCurtainWall is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. If the IfcCurtainWall establishes an aggregate, then all contained elements (defined by the IsDecomposedBy inverse attribute) shall be placed relative to the IfcCurtainWall.ObjectPlacement. Geometric Representation Currently, the use of 'BoundingBox', 'SurfaceModel', 'Brep' and 'MappedRepresentation' representations of IfcCurtainWall are supported. The conventions to use these representations are given at the level of the supertype, IfcBuildingElement.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifccurtainwall.htm"
|
|
},
|
|
"IfcCurtainWallType": {
|
|
"description": "The element type (IfcCurtainWallType) defines a list of commonly shared property set definitions of a curtain wall element and an optional set of product representations. It is used to define a curtain wall specification (i.e. the specific product information, that is common to all occurrences of that product type). A curtain wall type is used to define the common properties of a certain type of curtain wall that may be applied to many instances of that type to assign a specific style. Curtain wall types may be exchanged without being already assigned to occurrences. The occurrences of the IfcCurtainWallType are represented by instances of IfcCurtainWall.",
|
|
"predefined_types": {
|
|
"NOTDEFINED": "",
|
|
"USERDEFINED": ""
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifccurtainwalltype.htm"
|
|
},
|
|
"IfcCurve": {
|
|
"attributes": {
|
|
"Dim": "The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve. IfcCurveDim(SELF)"
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A curve can be envisioned as the path of a point moving in its coordinate space. Informal proposition: - A curve shall be arcwise connected - A curve shall have an arc length greater than zero.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccurve.htm"
|
|
},
|
|
"IfcCurveBoundedPlane": {
|
|
"attributes": {
|
|
"BasisSurface": "The surface to be bound.",
|
|
"Dim": "The space dimensionality of this class, defined by the dimensionality of the basis surface. BasisSurface.Dim",
|
|
"InnerBoundaries": "An optional set of inner boundaries. They shall not intersect each other or the outer boundary.",
|
|
"OuterBoundary": "The outer boundary of the surface."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: The curve bounded surface is a parametric surface with curved boundaries defined by one or more boundary curves. The bounded surface is defined to be the portion of the basis surface in the direction of N x T from any point on the boundary, where N is the surface normal and T the boundary curve tangent vector at this point. The region so defined shall be arcwise connected. The IfcCurveBoundedPlane is a specialized bounded surface class that deals only with bounding basis plane surfaces. The definition varies from STEP as outer and inner boundaries are separated attributes and refer to IfcCurve. The only basis surface that is allowed is of type IfcPlane, and the implicit_outer attribute has not been incorporated, since only unbounded surfaces are used as basis surface. The BasisSurface is an IfcPlane that establishes the position coordinate system by SELF\\IfcElementarySurface.Position. The OuterBoundary and the InnerBoundaries (if provided) shall lie on the surface of IfcPlane. Therefore the IfcCurve's establishing the outer and inner boundaries shall be: - either a 2D curve within the XY plane of the position coordinate sytem of IfcPlane - or a 3D curve with all coordinates having a z value = 0.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccurveboundedplane.htm"
|
|
},
|
|
"IfcCurveStyle": {
|
|
"attributes": {
|
|
"CurveColour": "The colour of the visible part of the curve. If not given, then the colour should be taken from the layer assignment with style, if that is not given either, then the default colour applies.",
|
|
"CurveFont": "A curve style font which is used to present a curve. It can either be a predefined curve font, or an explicitly defined curve font. Both may be scaled. If not given, then the curve font should be taken from the layer assignment with style, if that is not given either, then the default curve font applies.",
|
|
"CurveWidth": "A positive length measure in units of the presentation area for the width of a presented curve. If not given, then the style should be taken from the layer assignment with style, if that is not given either, then the default style applies."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: A curve style specifies the visual appearance of curves. An IfcCurveStyle provides the style table for presentation information assigned to geometric curves. The style is defined by a color, a font and a width. The IfcCurveStyle defines curve patterns as model patterns, i.e. the distance between visible and invisible segments of curve patterns are given in model space dimensions (that have to be scaled using the target plot scale). Styles are intended to be shared by multiple IfcStyledItem's, assigning the style to occurrences of (subtypes of) IfcGeometricRepresentationItem's. Measures given to a font pattern or a curve width are given in global drawing length units. The measure values for font pattern and curve width apply to the model space with a target plot scale provided for the correct appearance in the default plot scale.. For different scale and projection dependent curve styles a different instance of IfcCurveStyle needs to be used by IfcPresentationStyleAssignment for different IfcGeometricRepresentationSubContext dependent representations. An IfcCurveStyle can be assigned to IfcGeometricRepresentationItem's via the IfcPresentationStyleAssignment through an intermediate IfcStyledItem or IfcAnnotationCurveOccurrence.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifccurvestyle.htm"
|
|
},
|
|
"IfcCurveStyleFont": {
|
|
"attributes": {
|
|
"Name": "Name that may be assigned with the curve font.",
|
|
"PatternList": "A list of curve font pattern entities, that contains the simple patterns used for drawing curves. The patterns are applied in the order they occur in the list."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: A curve style font combines several curve style font pattern entities into a more complex pattern. The resulting pattern is repeated along the curve.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifccurvestylefont.htm"
|
|
},
|
|
"IfcCurveStyleFontAndScaling": {
|
|
"attributes": {
|
|
"CurveFont": "The curve font to be scaled.",
|
|
"CurveFontScaling": "The scale factor.",
|
|
"Name": "Name that may be assigned with the scaling of a curve font."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: A curve style font and scaling is a curve style font and a scalar factor for that font, so that a given curve style font may be applied at various scales. The IfcCurveStyleFontAndScaling allows for the reuse of the same curve style definition in several sizes. The definition of the CurveFontScale is the scaling of a base curve style pattern to be used as a new or derived curve style pattern. An example for IfcCurveStyleFontAndScaling is the sizing of a basic curve style dash pattern 'dash' (visible 0.01m, invisible 0.005m) into 'dash large' with CurveFontScale = 2 (resulting in visible 0.02m, invisible 0.01m), and into 'dash small' with CurveFontScale = 0.5 (resulting in visible 0.005m, invisible 0.0025m).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifccurvestylefontandscaling.htm"
|
|
},
|
|
"IfcCurveStyleFontPattern": {
|
|
"attributes": {
|
|
"InvisibleSegmentLength": "The length of the invisible segment in the pattern definition.",
|
|
"VisibleSegmentLength": "The length of the visible segment in the pattern definition. > NOTE For a visible segment representing a point, the value 0. should be assigned."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: A curve style font pattern is a pair of visible and invisible curve segment length measures in presentation area units.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifccurvestylefontpattern.htm"
|
|
},
|
|
"IfcDamperType": {
|
|
"description": "The element type IfcDamperType defines a list of commonly shared property set definitions of a damper and an optional set of product representations. It is used to define a damper specification (i.e. the specific product information, that is common to all occurrences of that product type). A damper type is used to define the common properties of a damper that may be applied to many occurrences of that type. A damper typically participates in an HVAC duct distribution system and is used to control or modulate the flow of air. Damper types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcDamperType are represented by instances of IfcFlowController or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DamperTypeCommon: common property set for all damper types Pset_DamperTypeControlDamper: property set for all control damper types Pset_DamperTypeFireDamper: property set for all fire damper types Pset_DamperTypeFireSmokeDamper: property set for all combination fire and smoke damper types Pset_DamperTypeSmokeDamper: property set for all smoke damper types",
|
|
"predefined_types": {
|
|
"BACKDRAFTDAMPER": "Damper used for purposes of manually balancing pressure differences. Commonly operated by mechanical adjustment.",
|
|
"BALANCINGDAMPER": "Backdraft damper used to restrict the movement of air in one direction. Commonly operated by mechanical spring.",
|
|
"BLASTDAMPER": "Blast damper used to prevent protect occupants and equipment against overpressures resultant of an explosion. Commonly operated by mechanical spring.",
|
|
"CONTROLDAMPER": "Control damper used to modulate the flow of air by adjusting the position of the blades. Commonly operated by an actuator of a building automation system.",
|
|
"FIREDAMPER": "Fire damper used to prevent the spread of fire for a specified duration. Commonly operated by fusable link that melts above a certain temperature.",
|
|
"FIRESMOKEDAMPER": "Combination fire and smoke damper used to preven the spread of fire and smoke. Commonly operated by a fusable link and a smoke detector.",
|
|
"FUMEHOODEXHAUST": "Fume hood exhaust damper. Commonly operated by actuator.",
|
|
"GRAVITYDAMPER": "Gravity damper closes from the force of gravity. Commonly operated by gravitational weight.",
|
|
"GRAVITYRELIEFDAMPER": "Gravity-relief damper used to allow air to move upon a buildup of enough pressure to overcome the gravitational force exerted upon the damper blades. Commonly operated by gravitational weight.",
|
|
"NOTDEFINED": "Undefined damper.",
|
|
"RELIEFDAMPER": "Relief damper used to allow air to move upon a buildup of a specified pressure differential. Commonly operated by mechanical spring.",
|
|
"SMOKEDAMPER": "Smoke damper used to prevent the spread of smoke. Commonly operated by a smoke detector of a building automation system.",
|
|
"USERDEFINED": "User-defined damper."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcdampertype.htm"
|
|
},
|
|
"IfcDateAndTime": {
|
|
"attributes": {
|
|
"DateComponent": "The date element of the date time combination.",
|
|
"TimeComponent": "The time element of the date time combination."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-41:1992: A moment of time on a particular day.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcdatetimeresource/lexical/ifcdateandtime.htm"
|
|
},
|
|
"IfcDefinedSymbol": {
|
|
"attributes": {
|
|
"Definition": "An implicit description of the symbol, either predefined or externally defined.",
|
|
"Target": "A description of the placement, orientation and (uniform or non-uniform) scaling of the defined symbol."
|
|
},
|
|
"description": "A defined symbol is a symbolic representation that gets its shape information by an established convention, either through a predefined symbol, or an externally defined symbol.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcdefinedsymbol.htm"
|
|
},
|
|
"IfcDerivedProfileDef": {
|
|
"attributes": {
|
|
"Label": "The name by which the transformation may be referred to. The actual meaning of the name has to be defined in the context of applications.",
|
|
"Operator": "Transformation operator applied to the parent profile.",
|
|
"ParentProfile": "The parent profile provides the origin of the transformation."
|
|
},
|
|
"description": "Definition from IAI: The IfcDerivedProfileDef defines the profile by transformation from the parent profile. The transformation is given by a two dimensional transformation operator. Transformation includes translation, rotation, mirror and scaling. The latter can be uniform or non uniform. The derived profiles may be used to define swept surfaces, swept area solids or sectioned spines. The transformation effects the position, rotation, mirroring or scale of the profile at the underlying coordinate system, i.e. the coordinate system defined by the swept surface or swept area solid that uses the profile definition. It is the xy plane of either: - IfcSweptSurface.Position - IfcSweptAreaSolid.Position or in case of sectioned spines the xy plane of each list member of IfcSectionedSpine.CrossSectionPositions. The position and potential rotation of the ParentProfile within the underlying coordinate system is taken into consideration before applying the Cartesian transformation operator. Illustration: Table: Derivation of derived profile definition",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcderivedprofiledef.htm"
|
|
},
|
|
"IfcDerivedUnit": {
|
|
"attributes": {
|
|
"Dimensions": "Dimensional exponents derived using the function IfcDerivedDimensionalExponents using (SELF) as the input value. IfcDeriveDimensionalExponents(Elements)",
|
|
"Elements": "The group of units and their exponents that define the derived unit.",
|
|
"UnitType": "Name of the derived unit chosen from an enumeration of derived unit types for use in IFC models.",
|
|
"UserDefinedType": ""
|
|
},
|
|
"description": "Definition from ISO/CD 10303-41:1992: A derived unit is an expression of units.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcderivedunit.htm"
|
|
},
|
|
"IfcDerivedUnitElement": {
|
|
"attributes": {
|
|
"Exponent": "The power that is applied to the unit attribute.",
|
|
"Unit": "The fixed quantity which is used as the mathematical factor."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-41:1992: A derived unit element is one of the unit quantities which makes up a derived unit.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcderivedunitelement.htm"
|
|
},
|
|
"IfcDiameterDimension": {
|
|
"description": "The diameter dimension is a draughting callout that presents the diameter extent of a conic element. It consists of a dimension curve and may have projection curves (but is often defined without projection curves). Illustration:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdiameterdimension.htm"
|
|
},
|
|
"IfcDimensionCalloutRelationship": {
|
|
"description": "A dimension callout relationship is a relationship between two draughting callouts. The relating draughting callout refers to a dimension (linear, diameter, radius, or angular) while the related draughting callout refers to the dimension text (as structured dimension callout). This structured dimension callout can either be denoted as \"primary\", in which case it presents the dimension value in the primary unit, or as \"secondary\", in which case it presents the dimension value in the secondary unit.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdimensioncalloutrelationship.htm"
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|
},
|
|
"IfcDimensionCurve": {
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|
"attributes": {
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|
"AnnotatedBySymbols": "Reference to the terminator symbols that may be assigned to the dimension curve. There shall be either zero, one or two terminator symbols assigned."
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|
},
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|
"description": "A dimension curve is an annotated curve within a dimension that has the dimension text and may have terminator symbols assigned. It is used to present the extent and the direction of the dimension.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdimensioncurve.htm"
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},
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|
"IfcDimensionCurveDirectedCallout": {
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|
"description": "The dimension curve directed callout is a dimension callout, which includes a dimension line. It normally presents an extent and/or direction of the product shape. Subtypes are introduced to declare specific forms of dimension curve directed callouts, such as: - linear dimension - radius dimension - diameter dimension - angular dimension",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdimensioncurvedirectedcallout.htm"
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|
},
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|
"IfcDimensionCurveTerminator": {
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|
"attributes": {
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|
"Role": "Role of the dimension curve terminator within a dimension curve (being either an origin or target)."
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|
},
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|
"description": "A dimension curve terminator is an annotated symbol, which is used at a dimension curve. It normally indicates the origin or target of the dimension curve.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdimensioncurveterminator.htm"
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|
},
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|
"IfcDimensionPair": {
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|
"description": "A dimension pair relationship is a relationship between two draughting callouts. The relating draughting callout refers to a dimension (linear, diameter, radius, or angular) and the related draughting callout refers to another dimension (linear, diameter, radius, or angular). This structured dimension callout can either be denoted as \"chained\", in which case the related dimension continues from the end of the relating dimension, or as \"parallel\", in which case the related dimension starts again from the start of the relating dimension.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdimensionpair.htm"
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},
|
|
"IfcDimensionalExponents": {
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|
"attributes": {
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|
"AmountOfSubstanceExponent": "The power of the amount of substance base quantity.",
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|
"ElectricCurrentExponent": "The power of the electric current base quantity.",
|
|
"LengthExponent": "The power of the length base quantity.",
|
|
"LuminousIntensityExponent": "The power of the luminous intensity base quantity.",
|
|
"MassExponent": "The power of the mass base quantity.",
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|
"ThermodynamicTemperatureExponent": "The power of the thermodynamic temperature base quantity.",
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|
"TimeExponent": "The power of the time base quantity."
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|
},
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|
"description": "Definition from ISO/CD 10303-41:1992: The dimensionality of any quantity can be expressed as a product of powers of the dimensions of base quantities. The dimensional exponents entity defines the powers of the dimensions of the base quantities. All the physical quantities are founded on seven base quantities (ISO 31 (clause 2)).",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcdimensionalexponents.htm"
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|
},
|
|
"IfcDirection": {
|
|
"attributes": {
|
|
"Dim": "The space dimensionality of this class, defined by the number of real in the list of DirectionRatios. HIINDEX(DirectionRatios)",
|
|
"DirectionRatios": "The components in the direction of X axis (DirectionRatios[1]), of Y axis (DirectionRatios[2]), and of Z axis (DirectionRatios[3])"
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|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: This entity defines a general direction vector in two or three dimensional space. The actual magnitudes of the components have no effect upon the direction being defined, only the ratios X:Y:Z or X:Y are significant.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcdirection.htm"
|
|
},
|
|
"IfcDiscreteAccessory": {
|
|
"description": "Representation of different kinds of accessories included in or added to elements. General usage The exact type information of the IfcDiscreteAccessory is given in the ObjectType attribute inherited from IfcObject. Standard type designations are provided for guideline below. The list is not exhaustive and the list of definitions may be extended based on local national extensions. Geometry Use Definitions: The geometric representation of IfcDiscreteAccessory is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcElementComponent. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcElementComponent. If the accessory is composed from several individual components it is represented through the IfcShapeRepresentation.Items with multiple geometry items.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcdiscreteaccessory.htm"
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|
},
|
|
"IfcDiscreteAccessoryType": {
|
|
"description": "The element type (IfcDiscreteAccessoryType) defines a list of commonly shared property set definitions of a discrete accessory and an optional set of product representations. It is used to define a supporting element mainly within structural and building services domains (i.e. the specific type information common to all occurrences of that type). The occurrences of the IfcDiscreteAccessoryType are represented by instances of IfcDiscreteAccessory. The IfcDiscreteAccessoryType is a specialization of the general building element component type to represent different type of structural and building service related auxiliary elements. General usage The exact type information of the IfcDiscreteAccessoryType is given in the ElementType attribute inherited from IfcElementType. Standard type designations are provided for guideline below. The list is not exhaustive and the list of definitions may be extended based on local national extensions.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcdiscreteaccessorytype.htm"
|
|
},
|
|
"IfcDistributionChamberElement": {
|
|
"description": "The IfcDistributionChamberElement defines a place at which distribution systems and their constituent elements may be inspected or through which they may travel. An IfcDistributionChamberElement is a formed volume used in a distribution system, such as a sump, trench or manhole. Instances of IfcSystem or IfcDistributionFlowElement may be related to the IfcDistributionChamberElement enabling their location in or at the chamber to be determined. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DistributionFlowElementCommon: common property set for distribution flow element occurrences Geometry Use Definitions The geometric representation of IfcDistributionChamberElement is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcDistributionFlowElement. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcDistributionFlowElement.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcdistributionchamberelement.htm"
|
|
},
|
|
"IfcDistributionChamberElementType": {
|
|
"description": "The element type IfcDistributionChamberElementType defines a list of commonly shared property set definitions of a distribution chamber element and an optional set of product representations. It is used to define a distribution chamber element specification (i.e. the specific product information, that is common to all occurrences of that product type). A distribution chamber element type is used to define the common properties of a distribution chamber element that may be applied to many occurrences of that type. A distribution chamber element is a formed volume used in a distribution system, such as a sump, trench or manhole. Distribution chamber element types may be exchanged without being already assigned to occurrences. The occurrences of the IfcDistributionChamberElementType are represented by instances of IfcDistributionElement or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release:",
|
|
"predefined_types": {
|
|
"FORMEDDUCT": "Space formed in the ground for the passage of pipes, cables, ducts.",
|
|
"INSPECTIONCHAMBER": "Chamber constructed on a drain, sewer or pipeline with a removable cover that permits visble inspection.",
|
|
"INSPECTIONPIT": "Recess or chamber formed to permit access for inspection of substructure and services.",
|
|
"MANHOLE": "hamber constructed on a drain, sewer or pipeline with a removable cover that permits the entry of a person.",
|
|
"METERCHAMBER": "Chamber that houses a meter(s).",
|
|
"NOTDEFINED": "Undefined chamber type.",
|
|
"SUMP": "Recessed or small chamber into which liquid is drained to facilitate its collection for removal.",
|
|
"TRENCH": "Excavated chamber, the length of which typically exceeds the width.",
|
|
"USERDEFINED": "User-defined chamber type.",
|
|
"VALVECHAMBER": "Chamber that houses a valve(s)."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcdistributionchamberelementtype.htm"
|
|
},
|
|
"IfcDistributionControlElement": {
|
|
"attributes": {
|
|
"AssignedToFlowElement": "Reference through the relationship object to related distribution flow elements.",
|
|
"ControlElementId": "The ControlElement Point Identification assigned to this control element by the Building Automation System."
|
|
},
|
|
"description": "The distribution element IfcDistributionControlElement defines occurrence elements of a building automation control system that are used to impart control over elements of a distribution system. This class defines elements of a building automation control system. These are typically used to control distribution system elements to maintain temperature, humidity, pressure, flow, power, lighting levels, etc., through the modulation, staging or sequencing of mechanical or electrical devices. The three general functional categories of ControlElements as defined for this release of the IFC model are as follows: - Impart control over flow control elements (IfcFlowController) in a distribution system such as dampers, valves, relays, etc., typically through the use of actuation (IfcActuator: See IfcHvacDomain schema). - Sensing elements (IfcSensor: See IfcHvacDomain schema) that measure changes in the controlled variable (e.g., temperature, humidity, pressure, flow, etc.). - Controllers (IfcController: See IfcHvacDomain schema) typically classified according to the control action they seek to perform and generally responsible for making decisions about the elements under control. Since this class and its subtypes typically relate to many different distribution flow elements (IfcDistributionFlowElement), the objectified relationship IfcRelFlowControlElements has been provided to relate control and flow elements as required. Geometry Use Definitions The geometric representation of IfcControlElement is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The local placement is defined in the supertype IfcProduct. It is defined by a subtype of IfcObjectPlacement which can define an absolute placement, relative placement, or grid reference, with each defining the local coordinate system referenced by all geometric representations. The PlacementRelTo relationship of IfcLocalPlacement, if given, shall point to the same IfcSpatialStructureElement which is used in the ContainedInStructure inverse attribute, or to a referenced spatial structure element at a higher level. If the relative placement is not used, the absolute placement is defined within the world coordinate system. Informal propositions for local placement: - If the LocalPlacement is specified, then all aggregated components should use this placement as their relative placement. Standard Geometric Representation Currently, the use of attribute driven geometry for this class is not supported. The standard geometric representation is defined using explicit geometry. B-Rep Representation The faceted B-Rep capabilities (with or without voids) shall be supported for B-Rep representation.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcdistributioncontrolelement.htm"
|
|
},
|
|
"IfcDistributionControlElementType": {
|
|
"description": "The element type IfcDistributionControlElementType defines a list of commonly shared property set definitions of an element and an optional set of product representations. It is used to define an element specification (i.e. the specific product information, that is common to all occurrences of that product type). A distribution control element type is used to define the common properties of a distribution control element that may be applied to many occurrences of that type. Distribution control element types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcDistributionControlElementType are represented by instances of IfcDistributionControlElement or its subtypes.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcdistributioncontrolelementtype.htm"
|
|
},
|
|
"IfcDistributionElement": {
|
|
"description": "Generalization of all elements that participate in a distribution system. Typical examples of IfcDistributionElement are (among others): - building service elements within a heating systems - building service elements within a cooling system - building service elements within a ventilation system - sanitary elements - electrical elements - elements within a communication network The IfcDistributionElement is further specialized in the IFC model. Direct instantiation of IfcDistributionElement without an assigned subtype of IfcDistributionElementType provides the meaning of an distribution element proxy. *Type Use Definition* The IfcDistributionElement defines the occurrence of any HVAC, electrical, sanitary or other element within a distribution system. Common information about distribution element types (or styles) is handled by subtypes of IfcDistributionElementType. The IfcDistributionElementType (if present) may establish the common type name, usage (or predefined) type, common material, common set of properties and common shape representations (using IfcRepresentationMap). The IfcDistributionElementType is attached using the IfcRelDefinedByType.RelatingType objectified relationship and is accessible by the inverse IsDefinedBy attribute. The assignment of types to distribution element occurrences is vital for providing the additional meaning, or ontology, of the distribution element. Many specialized type are defined in other schemas of the IFC specification. *Quantity Use Definition* The quantities relating to the IfcDistributionElement are defined by the IfcElementQuantity and attached by the IfcRelDefinesByProperties. A detailed specification for individual quantities is introduced at the level of subtypes of IfcDistributionElement. *Geometry Use Definitions* The geometric representation of IfcDistributionElement is given by the IfcProductDefinitionShape, allowing multiple geometric representation. Local Placement The local placement for IfcDistributionElement is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement , which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Geometric Representations The geometric representation of IfcDistributionElement is defined using different geometric representation types for the various subtypes. Only general recommendations are given at the level of the supertype, further constraints are defined at the level of its subtypes. - all occurrences of IfcDistributionElement (and its subtypes) should (whenever possible) share a representation map established by the assigned type. The geometric representation of the occurrence is then an IfcMappedItem. The IfcShapeRepresentation has: RepresentationIdentifier : 'Body' RepresentationType : 'MappedRepresentation' The shared geometric representation of the distribution element type (or in some cases of the distribution element) should follow (if applicable) the the following guidelines: - all fixtures (all non distribution flow elements, i.e. everything which is not a duct, a pipe, a cable, or a cable carrier) should be defined by an b-rep geometry. This includes also the complex flow fitting elements (e.g. Y branch or T branch) or distribution flow elements with size changes (e.g. reducer). The IfcShapeRepresentation has: RepresentationIdentifier : 'Body' RepresentationType : 'Brep' - if the geometric model consistency of a b-rep shape representation can not be guaranteed (arcwise connected volume bounded by faces, each being connected, oriented, finite, closed 2-manifold), a surface representation based on open shells should be used. The IfcShapeRepresentation then has: RepresentationIdentifier : 'Body' RepresentationType : 'SurfaceModel' - all \"simple\" distribution flow elements (general ducts and pipes) are defined by sweep geometry. The IfcShapeRepresentation has: RepresentationIdentifier : 'Body' RepresentationType : 'SweptSolid' - an additional representation type for all \"simple\" distribution flow elements (general ducts and pipes) is the ability to have a simple line based representation. The IfcShapeRepresentation has: RepresentationIdentifier : 'FootPrint' RepresentationType : 'GeometricCurveSet' - if only the analytical shape is required for which the exact interpolation between the cross sections is not required, a sectioned spine can be used. RepresentationIdentifier : 'Body' RepresentationType : 'SectionedSpine'",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcdistributionelement.htm"
|
|
},
|
|
"IfcDistributionElementType": {
|
|
"description": "The IfcDistributionElementType defines a list of commonly shared property set definitions of an element and an optional set of product representations. It is used to define an element specification (i.e. the specific product information, that is common to all occurrences of that product type). A distribution element type is used to define the common properties of a certain type of a distribution element that may be applied to many instances of that feature type to assign a specific style. Distribution element types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcDistributionElementType are represented by instances of IfcDistributionElement (or its subtypes).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcdistributionelementtype.htm"
|
|
},
|
|
"IfcDistributionFlowElement": {
|
|
"attributes": {
|
|
"HasControlElements": "Reference to the relationship object that relates control elements."
|
|
},
|
|
"description": "The distribution element IfcDistributionFlowElement defines occurrence elements of a distribution system that facilitate the distribution of energy or matter, such as air, water or power. The IfcDistributionFlowElement utilizes the following capabilities mainly through inverse references to objectified relationships: - Grouping - being part of a logical group of objects - Classification - assigned reference to an external classification - Documentation - assigned reference to an external documentation - Type - reference to the product type information for the element occurrence - Properties - reference to all attached properties, including quantities - Cost control - reference to cost elements associated with this distribution element - Work processes - reference to work tasks, in which this distribution element participates - Aggregation - aggregated together with other elements to form an aggregate - Connection - connectivity to other elements, including the definition of the connection or joint The IfcDistributionFlowElement defines the occurrence of a distribution element within the spatial context of a project. The parameters that define the type of the distribution element and/or its shape are defined by the IfcDistributionFlowElementType subtypes, which is related by the inverse relationship IsDefinedBy pointing to IfcRelDefinesByType. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DistributionFlowElementCommon: common property set for distribution flow element occurrences *Containment Use Definition* The IfcDistributionFlowElement, like any subtype of IfcBuildingElement, may participate in two different containment relationships. The first (and in most implementation scenarios mandatory) relationship is the hierachical spatial containment, the second (optional) relationship is the aggregation within an element assembly. - The IfcDistributionFlowElement is placed within the project spatial hierarchy using the objectified relationship IfcRelContainedInSpatialStructure, referring to it by its inverse attribute SELF\\IfcElement.ContainedInStructure. Subtypes of IfcSpatialStructureElement are valid spatial containers, with IfcBuildingStorey being the default container. - The IfcDistributionFlowElement may be aggregated into an element assembly using the objectified relationship IfcRelAggregates, referring to it by its inverse attribute SELF\\IfcObjectDefinition.Decomposes. Any subtype of IfcElement can be an element assembly, with IfcElementAssembly as a special focus subtype. In this case it should not be additionally contained in the project spatial hierarchy, i.e. SELF\\IfcElement.ContainedInStructure should be NIL. *Geometry Use Definitions* The geometric representation of IfcDistributionFlowElement is given by the IfcProductDefinitionShape, allowing multiple geometric representations. If an IfcRepresentationMap is defined for the IfcFlowElementType or one of its subtypes, then the IfcDistributionFlowELement utilizes it through the IfcMappedItem. Included geometric representations are: Local Placement The local placement is defined in the supertype IfcProduct. It is defined by the IfcLocalPlacement which can define an absolute placement, relative placement, or grid reference, with each defining the local coordinate system referenced by all geometric representations. If given, the PlacementRelTo relationship of IfcLocalPlacement, shall point to the referenced IfcProduct. If the relative placement is not used, the absolute placement is defined within the world coordinate system. Informal propositions for local placement: - If the LocalPlacement is specified, then all aggregated components should use this placement as their relative placement. Geometric Representations Currently, the use of 'SweptSolid', 'Clipping', 'Brep' and 'MappedRepresentation' representations are supported. In addition, the general representation types 'SurfaceModel' and 'BoundingBox' are allowed. The geometry use definitions for 'BoundingBox', 'SurfaceModel' and 'Brep' are explained at IfcBuildingElement. The geometry use definitions for 'SweptSolid' and 'Clipping' are identical to those explained in detail at IfcBeam. MappedRepresentation In addition to the standard and advanced geometric representation of IfcFlowDistributionElement that is defined using the SweptSolid or Clipping geometry, the MappedRepresentation shall be supported as it allows for reusing the geometry definition of the flow distribution element type at all occurrences of the same type. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier: 'Body' - RepresentationType: 'MappedRepresentation' The same constraints as those given for the standard SweptSolid and the advanced SweptSolid and Clipping geometric representations shall apply to the MappedRepresentation of the IfcRepresentationMap.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcdistributionflowelement.htm"
|
|
},
|
|
"IfcDistributionFlowElementType": {
|
|
"description": "The element type IfcDistributionFlowElementType defines a list of commonly shared property set definitions of an element and an optional set of product representations. It is used to define an element specification (i.e. the specific product information, that is common to all occurrences of that product type). A distribution flow element type is used to define the common properties of a distribution flow element that may be applied to many occurrences of that type. Distribution flow element types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcDistributionFlowElementType are represented by instances of IfcDistributionFlowElement or its subtypes.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcdistributionflowelementtype.htm"
|
|
},
|
|
"IfcDistributionPort": {
|
|
"attributes": {
|
|
"FlowDirection": "Enumeration that identifies if this port is a Sink (inlet), a Source (outlet) or both a SinkAndSource."
|
|
},
|
|
"description": "The product IfcDistributionPort defines the occurrence of a specialized port for use within the context of distribution elements. Its type is defined by IfcDistributionPortType or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DistributionPortDuct: property set for duct distribution port occurrences - Pset_DistributionPortPipe: property set for pipe distribution port occurrences Use Definitions The images below will help present the concepts of how an IfcDistributionPort is used to connect occurrences together in a distribution system. These concepts will be exemplified using a duct segment connecting to a tee and distributing air out through two connecting duct segments, as shown below in Figure 1. For the duct segments in this example, the concepts of the type, occurrence and performance history entities would be modeled using the following instances and shown in Figure 2: - The type (and representation) is defined using IfcDuctSegmentType from the IfcHvacDomain schema - The occurrences (and placements) are defined using IfcFlowSegment from the IfcSharedBldgServicesDomain schema - The performance history characteristics for these occurrence are defined using IfcPerformanceHistory from the IfcControlExtension schema The fitting would be represented in a similar manner using instances of IfcDuctFittingType, IfcFlowFitting and IfcPerformanceHistory for the type, occurrence and performance history entities respectively. Figure 3 includes all the type and occurrence entities that are involved in the duct and fitting example, as well as how the property sets defining type are related. Also included is how a port is involved in the connectivity of these entities. If we look specifically at the point in the example where the duct segment connects to the inlet of the tee fitting, as shown in Figure 4, there is a port on the duct and a port on the tee which are used to logically relate the two together so that a connection is inferred. This connection may be physically realized with a specific fitting that is used to physically connect the duct segment and the tee fitting, such as a flange or coupling. It is important to note that the notion of a port is different from that of a connector. Figure 5 indicates how fluid flow properties and connection-specific information may be incorporated at the mass-flow boundary layers within this example.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcdistributionport.htm"
|
|
},
|
|
"IfcDocumentElectronicFormat": {
|
|
"attributes": {
|
|
"FileExtension": "File extension of electronic document used by computer operating system.",
|
|
"MimeContentType": "Main Mime type (as published by W3C or as user defined application type)",
|
|
"MimeSubtype": "Mime subtype information."
|
|
},
|
|
"description": "An IfcDocumentElectronicFormat captures the type of document being referenced as an external source,and for which metadata is specified by IfcDocumentInformation.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcdocumentelectronicformat.htm"
|
|
},
|
|
"IfcDocumentInformation": {
|
|
"attributes": {
|
|
"Confidentiality": "The level of confidentiality of the document.",
|
|
"CreationTime": "Date and time stamp when the document was originally created.",
|
|
"Description": "Description of document and its content.",
|
|
"DocumentId": "Identifier that uniquely identifies a document.",
|
|
"DocumentOwner": "Information about the person and/or organization acknowledged as the 'owner' of this document. In some contexts, the document owner determines who has access to or editing right to the document.",
|
|
"DocumentReferences": "Information on the referenced document.",
|
|
"Editors": "The persons and/or organizations who have created this document or contributed to it.",
|
|
"ElectronicFormat": "Describes the electronic format of the document being referenced, providing the file extension and the manner in which the content is provided.",
|
|
"IntendedUse": "Intended use for this document.",
|
|
"IsPointedTo": "An inverse relationship from the IfcDocumentInformationRelationship to the related documents.",
|
|
"IsPointer": "An inverse relationship from the IfcDocumentInformationRelationship to the relating document.",
|
|
"LastRevisionTime": "Date and time stamp when this document version was created.",
|
|
"Name": "File name or document name assigned by owner.",
|
|
"Purpose": "Purpose for this document.",
|
|
"Revision": "Document revision designation",
|
|
"Scope": "Scope for this document.",
|
|
"Status": "The current status of the document. Examples of status values that might be used for a document information status include: - DRAFT - FINAL DRAFT - FINAL - REVISION",
|
|
"ValidFrom": "Date, when the document becomes valid.",
|
|
"ValidUntil": "Date until which the document remains valid."
|
|
},
|
|
"description": "An IfcDocumentInformation captures \"metadata\" of an external document. The actual content of the document is not defined in IFC ; instead, it can be found following the reference given to IfcDocumentReference.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcdocumentinformation.htm"
|
|
},
|
|
"IfcDocumentInformationRelationship": {
|
|
"attributes": {
|
|
"RelatedDocuments": "The document that acts as the child, referenced or replacing document in a relationship.",
|
|
"RelatingDocument": "The document that acts as the parent, referencing or original document in a relationship.",
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"RelationshipType": "Describes the type of relationship between documents. This could be sub-document, replacement etc. The interpretation has to be established in an application context."
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},
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|
"description": "An IfcDocumentInformationRelationship is a relationship class that enables a document to have the ability to reference other documents. This class can be used to describe relationships in which one document may reference one or more other sub documents or where a document is used as a replacement for another document (but where both the original and the replacing document need to be retained).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcdocumentinformationrelationship.htm"
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},
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"IfcDocumentReference": {
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"attributes": {
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"ReferenceToDocument": "The document information that is being referenced."
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},
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"description": "An IfcDocumentReference is a reference to the location of a document. The reference is given by a system interpretable Location attribute (e.g., an URL string) or by a human readable location, where the document can be found, and an optional inherited internal reference ItemReference, which refers to a system interpretable position within the document. The optional inherited Name attribute is meant to have meaning for human readers. Optional document metadata can also be captured through reference to IfcDocumentInformation. Provides a lightweight capability that enables a document to be identified solely by reference to a name by which it is commonly known. The reference can also be used to point to document information for more detail as required. For example, the IAI mission statement in a document \"Introduction to IAI\" can be referenced by IfcDocumentReference.Location = 'http://iai-international.org/intro.html', and IfcDocumentReference = 'Mission statement'. Additionally: IfcDocumentReference.ReferenceToDocument[1].Name = 'Introduction to IAI', and IfcDocumentReference.ReferenceToDocument[1].Description = 'Basic document to introduce the aims of IAI'.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcdocumentreference.htm"
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},
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"IfcDoor": {
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"attributes": {
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"OverallHeight": "Overall measure of the height, it reflects the Z Dimension of a bounding box, enclosing the ~~body of the~~ door opening. If omitted, the _OverallHeight_ should be taken from the geometric representation of the _IfcOpening_ in which the door is inserted. > NOTE The body of the door might be taller then the door opening (e.g. in cases where the door lining includes a casing). In these cases the OverallHeight shall still be given as the door opening height, and not as the total height of the door lining.",
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"OverallWidth": "Overall measure of the width, it reflects the X Dimension of a bounding box, enclosing the ~~body of the~~ door opening. If omitted, the _OverallWidth_ should be taken from the geometric representation of the _IfcOpening_ in which the door is inserted. > NOTE The body of the door might be wider then the door opening (e.g. in cases where the door lining includes a casing). In these cases the OverallWidth shall still be given as the door opening width, and not as the total width of the door lining."
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},
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"description": "Definition from ISO 6707-1:1989: Construction for closing an opening, intended primarily for access with hinged, pivoted or sliding operation. The door is a building element that is predominately used to provide controlled access for people and goods. It includes constructions with hinged, pivoted, sliding, and additionally revolving and folding operations. A door consists of a lining and one or several panels, properties concerning the lining and panel are defined by the IfcDoorLiningProperties and the IfcDoorPanelProperties. The door entity, IfcDoor, defines a particular occurrence of a door inserted in the spatial context of a project. A door can: - either be inserted as a filler in an opening, then the IfcDoor has an inverse attribute FillsVoids provided, - or be a \"free standing\" door, then the IfcDoor has no inverse attribute FillsVoids provided. The actual parameter of the door and/or its shape are defined by the IfcDoor as the occurrence definition (or project instance), or by the IfcDoorStyle as the specific definition (or project type). Parameters are given: - at the IfcDoor for occurrence specific parameters. The IfcDoor specifies: the door width and height the door opening direction (by the y-axis of the ObjectPlacement) - at the IfcDoorStyle, to which the IfcDoor is related by the inverse relationship IsDefinedBy pointing to IfcRelDefinesByType, for style parameters common to all occurrences of the same style. the operation type (single swing, double swing, revolving, etc.) the door hinge side (by using two different styles for right and left opening doors) the construction type the particular attributes for the lining by the IfcDoorLiningProperties the particular attributes for the panels by the IfcDoorPanelProperties The IfcDoor is normally inserted into an IfcOpeningElement (but does not need to - see above) using the IfcRelFillsElement relationship. It is also directly linked to the spatial structure of the project (and here normally to the IfcBuildingStorey, or to the IfcSpace) using the IfcRelContainedInSpatialStructure relationship. *Property Set Use Definition*: The property sets relating to the IfcDoor are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcDoor are part of this IFC release: - Pset_DoorCommon: common property set for all door occurrences - Pset_DoorWindowGlazingType: specific property set for the glazing properties of the door glazing, if available - Pset_DoorWindowShadingType: specific property set for the shading properties of the door glazing, if available *Geometry Use Definitions*: The geometric representation of IfcDoor is given by the IfcProductDefinitionShape, allowing multiple geometric representations. The IfcDoor, in case of an occurrence object, gets its parameter and shape from the IfcDoorStyle. If an IfcRepresentationMap (a block definition) is defined for the IfcDoorStyle, then the IfcDoor inserts it through the IfcMappedItem. Local Placement The local placement for IfcDoor is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point to the local placement of the same element (if given), in which the IfcDoor is used as a filling (normally an IfcOpeningElement), as provided by the IfcRelFillsElement relationship. - If the IfcDoor is not inserted into an IfcOpeningElement, then the PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Geometric Representation The geometric representation of IfcDoor is defined using the following (potentially multiple) IfcShapeRepresentation's for its IfcProductDefinitionShape: - Profile: A 'GeometricCurveSet' consisting of a single closed curve defining the outer boundary of the door (lining). The door parametric representation uses this profile in order to apply the door lining and panel parameter. If not provided, the profile of the IfcOpeningElement is taken. - FootPrint: A 'GeometricCurveSet', or 'Annotation2D' representation defining the 2D shape of the door - Body: A 'SweptSolid', 'SurfaceModel', or 'Brep' representation defining the 3D shape of the door. In addition the parametric representation of a (limited) door shape is available by applying the parameters from IfcDoorStyle referencing IfcDoorLiningProperties and IfcDoorPanelProperties. The purpose of the parameter is described at those entities and below (door opening operation by door style). Profile - 'GeometricCurveSet' representation The door profile is represented by a three-dimensional closed curve within a particular shape representation. The profile is used to apply the parameter of the parametric door representation. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Profile' - RepresentationType : 'GeometricCurveSet', only a single closed curve shall be contained in the set of IfcShapeRepresentation.Items. A 'Profile' representation has to be provided if: - a parametric representation shall be applied to the door AND the door is 'free standing', or the opening into which the door is inserted is not extruded horizontally (i.e. where the opening profile does not match the door profile) FootPrint - 'GeometricCurveSet' or 'Annotation2D' representation The door foot print is represented by a set of two-dimensional curves (or in case of 'Annotation2D' additional hatching and text) within a particular shape representation. The foot print is used for the planview representation of the door. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'FootPrint' - RepresentationType : 'GeometricCurveSet', or 'Annotation2D' Body - 'SweptSolid', 'SurfaceModel', or 'Brep' representation The door body is either represented parameterically (see parametric representation) or by explicit 3D shape. The 3D shape is given by using extrusion geometry, or surface models, or Brep models within a particular shape representation. The body is used for the model view representation of the door. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'SweptSolid', 'SurfaceModel', or 'Brep' MappedRepresentation The 'FootPrint' and 'Body' geometric representation of IfcDoor can be shared among several identical doors using the 'MappedRepresentation'. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'FootPrint', 'Body' - RepresentationType : 'MappedRepresentation' The same constraints, as given for the 'FootPrint', 'Body' representation identifiers, shall apply to the MappedRepresentation of the IfcRepresentationMap. *Door opening operation by door style* The parameters that defines the shape of the IfcDoor, are given at the IfcDoorStyle and the property sets, which are included in the IfcDoorStyle. The IfcDoor only defines the local placement which determines the opening direction of the door. The overall size of the IfcDoor to be used to apply the lining or panel parameter provided by the IfcDoorStyle is determined by the IfcShapeRepresentation with the RepresentationIdentifier = 'Profile'. Only in case of an IfcDoor inserted into an IfcOpeningElement using the IfcRelFillsElement relationship, having a horizontal extrusion (along the y-axis of the IfcDoor), the overall size is determined by the extrusion profile of the IfcOpeningElement.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcdoor.htm"
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},
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|
"IfcDoorLiningProperties": {
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"attributes": {
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"CasingDepth": "Depth of the casing (dimension in plane perpendicular to door leaf). If given it is applied equally to all four sides of the adjacent wall.",
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|
"CasingThickness": "Thickness of the casing (dimension in plane of the door leaf). If given it is applied equally to all four sides of the adjacent wall.",
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"LiningDepth": "Depth of the door lining, measured perpendicular to the plane of the door lining. If omitted (and with a given value to lining thickness) it indicates an adjustable depth (i.e. a depth that adjusts to the thickness of the wall into which the occurrence of this door style is inserted).",
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"LiningOffset": "Offset (dimension in plane perpendicular to door leaf) of the door lining. The offset is given as distance to the x axis of the local placement.",
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"LiningThickness": "Thickness (width in plane parallel to door leaf) of the door lining.",
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|
"ShapeAspectStyle": "Pointer to the shape aspect, if given. The shape aspect reflects the part of the door shape, which represents the door lining.",
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|
"ThresholdDepth": "Depth (dimension in plane perpendicular to door leaf) of the door threshold. Only given if the door lining includes a threshold. If omitted (and with a given value to threshold thickness) it indicates an adjustable depth (i.e. a depth that adjusts to the thickness of the wall into which the occurrence of this door style is inserted).",
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"ThresholdOffset": "Offset (dimension in plane perpendicular to door leaf) of the door threshold. The offset is given as distance to the x axis of the local placement. Only given if the door lining includes a threshold and the parameter is known.",
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"ThresholdThickness": "Thickness (width in plane parallel to door leaf) of the door threshold. Only given if the door lining includes a threshold and the parameter is known.",
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"TransomOffset": "Offset of the transom (if given) which divides the door leaf from a glazing (or window) above. The offset is given from the bottom of the door opening.",
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"TransomThickness": "Thickness (width in plane parallel to door leaf) of the transom (if given) which divides the door leaf from a glazing (or window) above."
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},
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|
"description": "Definition of IAI: The door lining is the frame which enables the door leaf to be fixed in position. The door lining is used to hang the door leaf. The parameters of the door lining (IfcDoorLiningProperties) define the geometrically relevant parameter of the lining. The IfcDoorLiningProperties are included in the list of properties (HasPropertySets) of the IfcDoorStyle. More information about the door lining can be included in the same list of the IfcDoorStyle using the IfcPropertySet for dynamic extensions. *Geometry Use Definitions* The IfcDoorLiningProperties does not hold its own geometric representation. However it defines parameters which can be used to create the shape of the door style (which is inserted by the IfcDoor into the spatial context of the project). Interpretation of parameter The parameters of the IfcDoorLiningProperties define a standard door lining, including (if given) a threshold and a transom. The outer boundary of the lining is determined by the occurrence parameter assigned to the IfcDoor, which inserts the IfcDoorStyle.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcdoorliningproperties.htm"
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},
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"IfcDoorPanelProperties": {
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"attributes": {
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"PanelDepth": "Depth of the door panel, measured perpendicular to the plane of the door leaf.",
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|
"PanelOperation": "The PanelOperation defines the way of operation of that panel. The PanelOperation of the door panel has to correspond with the OperationType of the IfcDoorStyle.",
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"PanelPosition": "Position of this panel within the door.",
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"PanelWidth": "Width of this panel, given as ratio relative to the total clear opening width of the door.",
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|
"ShapeAspectStyle": "Pointer to the shape aspect, if given. The shape aspect reflects the part of the door shape, which represents the door panel."
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},
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|
"description": "A description of the door panel. A door panel is normally a door leaf that opens to allow people or goods to pass. The parameters of the door panel define the geometrically relevant parameter of the panel, The IfcDoorPanelProperties are included in the list of properties , given by attribute HasPropertySets of the IfcDoorStyle. More information about the door panel can be included in the same list of the IfcDoorStyle using the IfcPropertySet for dynamic extensions. *Geometry Use Definitions* The IfcDoorPanelProperties does not hold an own geometric representation. However it defines parameter, which can be used to create the shape of the door style (which is inserted by the IfcDoor into the spatial context of the project). Interpretation of parameters The parameters of the IfcDoorPanelProperties define a standard door panel, including (if given) a proportional width to define non-uniform double swing (or sliding, or folding) doors. The outer boundary of the panel is determined by the occurrence parameter assigned to the IfcDoor, which inserts the IfcDoorStyle. It has to take the lining parameter into account as well.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcdoorpanelproperties.htm"
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},
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"IfcDoorStyle": {
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"attributes": {
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"ConstructionType": "Type defining the basic construction and material type of the door.",
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"OperationType": "Type defining the general layout and operation of the door style.",
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"ParameterTakesPrecedence": "The Boolean value reflects, whether the parameter given in the attached lining and panel properties exactly define the geometry (TRUE), or whether the attached style shape take precedence (FALSE). In the last case the parameter have only informative value.",
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"Sizeable": "The Boolean indicates, whether the attached _IfcMappedRepresentation_ (if given) can be sized (using scale factor of transformation), or not (FALSE). If not, the _IfcMappedRepresentation_ should be _IfcShapeRepresentation_ of the _IfcDoor_ (using _IfcMappedItem_ as the _Item_) with the scale factor = 1."
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},
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"description": "Definition from IAI: The door style, IfcDoorStyle, defines a particular style of doors, which may be included into the spatial context of the building model through an (or multiple) instances of IfcDoor. A door style defines the overall parameter of the door style and refers to the particular parameter of the lining and one (or several) panels through the IfcDoorLiningProperties and the IfcDoorPanelProperties. The door entity, IfcDoor, defines a particular occurrence of a door inserted in the spatial context of a project. The actual parameter of the door and/or its shape is defined at the IfcDoorStyle, to which the IfcDoor is related by the inverse relationship IsDefinedBy pointing to IfcRelDefinedByType. The IfcDoorStyle also defines the particular attributes for the lining_, IfcDoorLiningProperties_, and panels, IfcDoorPanelProperties. *Geometry Use Definitions*: The IfcDoorStyle defines the baseline geometry, or the representation map, for all occurrences of the door style, given by the IfcDoor, pointing to this style. The representation of the door style may be given by the agreed set of minimal parameters, defined for the door lining and the door panel(s), or it may be given by a geometric representation used by the IfcRepresentationMap. The attribute ParameterTakesPrecedence decides, whether the set of parameters can be used to exactly represent the shape of the door style (TRUE), or whether the attached IfcRepresentationMap holds the exact representation (FALSE). Interpretation of parameter The IfcDoorStyleOperationTypeEnum defines the general layout of the door style. Depending on the enumerator, the appropriate instances of IfcDoorLiningProperties and IfcDoorPanelProperties are attached in the list of HasPropertySets. The _IfcDoorStyleOperationTypeEnum_mainly determines the hinge side (left hung, or right hung), the operation (swinging, sliding, folding, etc.) and the number of panels. See geometry use definitions at _IfcDoorStyleOperationTypeEnum_for the correct usage of opening symbols for different operation types.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcdoorstyle.htm"
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},
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|
"IfcDraughtingCallout": {
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|
"attributes": {
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|
"Contents": "The annotation curves, symbols, or text comprising the presentation of information.",
|
|
"IsRelatedFromCallout": "",
|
|
"IsRelatedToCallout": ""
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|
},
|
|
"description": "A draughting callout is a collection of annotated curves, symbols and text that presents some product shape or definition properties within a drawing.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdraughtingcallout.htm"
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},
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|
"IfcDraughtingCalloutRelationship": {
|
|
"attributes": {
|
|
"Description": "Additional informal description of the relationship.",
|
|
"Name": "The word or group of words by which the relationship is referred to.",
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|
"RelatedDraughtingCallout": "The other of the draughting callouts which is a part of the relationship.",
|
|
"RelatingDraughtingCallout": "One of the draughting callouts which is a part of the relationship."
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|
},
|
|
"description": "The draughting callout relationship establishes a logical relationship between two draughting callouts. The meaning of this relationship is given at the subtypes of this entity.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdraughtingcalloutrelationship.htm"
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|
},
|
|
"IfcDraughtingPreDefinedColour": {
|
|
"description": "The draughting pre defined colour is a pre defined colour for the purpose to identify a colour by name. Allowable names are: - 'black', - 'red', - 'green', - 'blue', - 'yellow', - 'magenta', - 'cyan', - 'white', The following table states the RGB values associated with the names given by the IfcDraughtingPreDefinedColour.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifcdraughtingpredefinedcolour.htm"
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|
},
|
|
"IfcDraughtingPreDefinedCurveFont": {
|
|
"description": "The draughting predefined curve font type defines a selection of widely used curve fonts for draughting purposes by name. Illustration from ISO 10303-46 TC2:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcdraughtingpredefinedcurvefont.htm"
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|
},
|
|
"IfcDraughtingPreDefinedTextFont": {
|
|
"description": "The draughting pre defined text font is a pre defined text font for the purpose to identify a font by name. Allowable names are: - 'ISO 3098-1 font A', - 'ISO 3098-1 font B', The ISO 3098-1 font A is the text font as denoted as Letterng A in clause 3 of ISO 3098-1, the ISO 3098-1 font B is the text font as denoted as Letterng B in clause 3 of ISO 3098-1.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifcdraughtingpredefinedtextfont.htm"
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|
},
|
|
"IfcDuctFittingType": {
|
|
"description": "The element type IfcDuctFittingType defines a list of commonly shared property set definitions of a duct fitting and an optional set of product representations. It is used to define an duct fitting specification (i.e. the specific product information, that is common to all occurrences of that product type). A Duct fitting type is used to define the common properties of a duct fitting that may be applied to many occurrences of that type. A duct fitting is a junction or transition in a flow distribution system (e.g., elbow, tee, etc.). Duct fitting types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcDuctFittingType are represented by instances of IfcFlowFitting or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DuctFittingTypeCommon: common property set for all duct fitting types",
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|
"predefined_types": {
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|
"BEND": "A fitting with typically two ports used to change the direction of flow between connected elements.",
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|
"CONNECTOR": "Connector fitting, typically used to join two ports together within a flow distribution system (e.g., a coupling used to join two duct segments).",
|
|
"ENTRY": "Entry fitting, typically unconnected at one port and connected to a flow distribution system at the other (e.g., an outside air duct system intake opening).",
|
|
"EXIT": "Exit fitting, typically unconnected at one port and connected to a flow distribution system at the other (e.g., an exhaust air discharge opening).",
|
|
"JUNCTION": "A fitting with typically more than two ports used to redistribute flow among the ports and/or to change the direction of flow between connected elements (e.g, tee, cross, wye, etc.).",
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|
"NOTDEFINED": "Undefined fitting.",
|
|
"OBSTRUCTION": "A fitting with typically two ports used to obstruct or restrict flow between the connected elements (e.g., screen, perforated plate, etc.).",
|
|
"TRANSITION": "A fitting with typically two ports having different shapes or sizes. Can also be used to change the direction of flow between connected elements.",
|
|
"USERDEFINED": "User-defined fitting."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcductfittingtype.htm"
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|
},
|
|
"IfcDuctSegmentType": {
|
|
"description": "The element type IfcDuctSegmentType defines a list of commonly shared property set definitions of a duct segment and an optional set of product representations. It is used to define a duct segment specification (i.e. the specific product information, that is common to all occurrences of that product type). A Duct Segment type is used to define the common properties of a duct segment that may be applied to many occurrences of that type. A duct segment is used to typically join two sections of duct network. Duct segment types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcDuctSegmentType are represented by instances of IfcFlowSegment or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DuctSegmentTypeCommon: common property set for all duct segment types",
|
|
"predefined_types": {
|
|
"FLEXIBLESEGMENT": "A flexible segment is a continuous non-linear segment of duct that can be deformed and change the direction of flow.",
|
|
"NOTDEFINED": "Undefined segment.",
|
|
"RIGIDSEGMENT": "A rigid segment is a continuous linear segment of duct that cannot be deformed.",
|
|
"USERDEFINED": "User-defined segment."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcductsegmenttype.htm"
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|
},
|
|
"IfcDuctSilencerType": {
|
|
"description": "The element type IfcDuctSilencerType defines a list of commonly shared property set definitions of a duct silencer and an optional set of product representations. It is used to define a duct silencer specification (i.e. the specific product information, that is common to all occurrences of that product type). A duct silencer type is used to define the common properties of a duct silencer that may be applied to many occurrences of that type. A duct silencer is a device that is typically installed inside a duct distribution system for the purpose of reducing the noise levels from air movement, fan noise, etc. in the adjacent space or downstream of the duct silencer device. Duct silencer types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcDuctSilencerType are represented by instances of IfcFlowTreatmentDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DuctSilencerTypeCommon: common property set for all duct silencer types",
|
|
"predefined_types": {
|
|
"FLATOVAL": "Flat-oval shaped duct silencer type.",
|
|
"NOTDEFINED": "Undefined duct silencer type.",
|
|
"RECTANGULAR": "Rectangular shaped duct silencer type.",
|
|
"ROUND": "Round duct silencer type.",
|
|
"USERDEFINED": "User-defined duct silencer type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcductsilencertype.htm"
|
|
},
|
|
"IfcEdge": {
|
|
"attributes": {
|
|
"EdgeEnd": "End point (vertex) of the edge. The same vertex can be used for both EdgeStart and EdgeEnd.",
|
|
"EdgeStart": "Start point (vertex) of the edge."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: An edge is the topological construct corresponding to the connection of two vertices. More abstractly, it may stand for a logical relationship between two vertices. The domain of an edge, if present, is a finite, non-self-intersecting open curve in R^M^, that is, a connected 1-dimensional manifold. The bounds of an edge are two vertices, which need not be distinct. The edge is oriented by choosing its traversal direction to run from the first to the second vertex. If the two vertices are the same, the edge is a self loop. The domain of the edge does not include its bounds, and 0 \u2264 \u039e \u2264 \u221e. Associated with an edge may be a geometric curve to locate the edge in a coordinate space; this is represented by the edge curve (IfcEdgeCurve) subtype. The curve shall be finite and non-self-intersecting within the domain of the edge. An edge is a graph, so its multiplicity M and graph genus G^e^ may be determined by the graph traversal algorithm. Since M = E = 1, the Euler equation (1) reduces in the case to where V = 1 or 2, and G^e^ = 1 or 0. Specifically, the topological edge defining data shall satisfy: Informal propositions: - The edge has dimensionality 1. - The extend of an edge shall be finite and nonzero",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcedge.htm"
|
|
},
|
|
"IfcEdgeCurve": {
|
|
"attributes": {
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|
"EdgeGeometry": "The curve which defines the shape and spatial location of the edge. This curve may be unbounded and is implicitly trimmed by the vertices of the edge; this defines the edge domain. Multiple edges can reference the same curve.",
|
|
"SameSense": "This logical flag indicates whether (TRUE), or not (FALSE) the senses of the edge and the curve defining the edge geometry are the same. The sense of an edge is from the edge start vertex to the edge end vertex; the sense of a curve is in the direction of increasing parameter."
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|
},
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|
"description": "Definition from ISO/CD 10303-42:1992: An edge curve is a special subtype of edge which has its geometry fully defined. The geometry is defined by associating the edge with a curve which may be unbounded. As the topological and geometric directions may be opposed, an indicator (same sense) is used to identify whether the edge and curve directions agree or are opposed. The Boolean value indicates whether the curve direction agrees with (TRUE) or is in the opposite direction (FALSE) to the edge direction. Any geometry associated with the vertices of the edge shall be consistent with the edge geometry. Informal propositions: - The domain of the edge curve is formally defined to be the domain of its edge geometry as trimmed by the vertices. This domain does not include the vertices. - An edge curve has non-zero finite extent. - An edge curve is a manifold. - An edge curve is arcwise connected. - The edge start is not a part of the edge domain. - The edge end is not a part of the edge domain. - Vertex geometry shall be consistent with edge geometry.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcedgecurve.htm"
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|
},
|
|
"IfcEdgeFeature": {
|
|
"attributes": {
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|
"FeatureLength": "The length of the feature in orthogonal direction from the feature cross section."
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|
},
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|
"description": "A feature describing the edge shape of an building element. Geometry Use Definitions: The geometric representation of IfcEdgeFeature is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined in the supertype IfcFeatureElementSubtraction. Standard Geometric Representation The use of Standard Geometric Representations is defined in the supertype IfcFeatureElementSubtraction.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcedgefeature.htm"
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|
},
|
|
"IfcEdgeLoop": {
|
|
"attributes": {
|
|
"EdgeList": "A list of oriented edge entities which are concatenated together to form this path.",
|
|
"Ne": "The number of elements in the edge list. SIZEOF(EdgeList)"
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: An edge_loop is a loop with nonzero extent. It is a path in which the start and end vertices are the same. Its domain, if present, is a closed curve. An edge_loop may overlap itself. Informal propositions: - The genus of the IfcEdgeLoop shall be 1 or greater. - The Euler formula shall be satisfied: (number of vertices) + genus - (number of edges) = 1; - No edge may be referenced more than once by the same IfcEdgeLoop with the same sense. For this purpose, an edge which is not an oriented edge is considered to be referenced with the sense TRUE.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcedgeloop.htm"
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|
},
|
|
"IfcElectricApplianceType": {
|
|
"description": "An IfcElectricApplianceType defines a particular type of common electrical appliance found in a typical AEC/FM facility. Electrical Appliances generally consist of electrical devices that are not a fixed part of the building but instead can be moved from one space to another and are powered with electricity. *Use Definitions* An IfcElectricApplianceType is a subtype of IfcFlowTerminalType that provides for various forms of electrical appliance. Usage of IfcElectricApplianceType defines the parameters for one or more occurrences of IfcFlowTerminal. *Property Set Use Definition*: The property sets relating to the IfcElectricApplianceType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcElectricApplianceType are part of this IFC release: - Pset_ElectricalDeviceCommon: property set for properties that are common to all types of electrical devices, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"COMPUTER": "",
|
|
"DIRECTWATERHEATER": "",
|
|
"DISHWASHER": "An appliance that has the primary function of washing dishes.",
|
|
"ELECTRICCOOKER": "An electrical appliance that has the primary function of cooking food (including oven, hob, grill).",
|
|
"ELECTRICHEATER": "",
|
|
"FACSIMILE": "",
|
|
"FREESTANDINGFAN": "An electrical appliance that is used occasionally to provide ventilation. A freestanding fan is a 'plugged' appliance whose load may be removed from an electric circuit.",
|
|
"FREEZER": "An electrical appliance that has the primary function of storing food at temperatures below the freezing point of water.",
|
|
"FRIDGE_FREEZER": "An electrical appliance that combines the functions of a freezer and a refrigerator through the provision of separate compartments.",
|
|
"HANDDRYER": "An electrical appliance that has the primary function of drying hands.",
|
|
"INDIRECTWATERHEATER": "",
|
|
"MICROWAVE": "An electrical appliance that has the primary function of cooking food using microwaves.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"PHOTOCOPIER": "A machine that has the primary function of reproduction of printed matter.",
|
|
"PRINTER": "",
|
|
"RADIANTHEATER": "",
|
|
"REFRIGERATOR": "An electrical appliance that has the primary function of storing food at low temperature but above the freezing point of water.",
|
|
"SCANNER": "",
|
|
"TELEPHONE": "",
|
|
"TUMBLEDRYER": "An electrical appliance that has the primary function of drying clothes.",
|
|
"TV": "",
|
|
"USERDEFINED": "User-defined type.",
|
|
"VENDINGMACHINE": "An appliance that stores and vends goods including food, drink and goods of various types.",
|
|
"WASHINGMACHINE": "An appliance that has the primary function of washing clothes.",
|
|
"WATERCOOLER": "",
|
|
"WATERHEATER": ""
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectricappliancetype.htm"
|
|
},
|
|
"IfcElectricDistributionPoint": {
|
|
"attributes": {
|
|
"DistributionPointFunction": "Identifies the functions or purposes that a distribution point may fulfill from which that required may be selected.",
|
|
"UserDefinedFunction": ""
|
|
},
|
|
"description": "An IfcElectricDistributionPoint is a flow controller in which instances of electrical devices are brought together at a single place for a particular purpose *Property Set Use Definition*: The property sets relating to the IfcElectricDistributionPoint_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an _IfcElectricDistributionPoint_are part of this IFC release: - Pset_ElectricDistributionPointCommon: common property set for all types of an electric distribution point panel, distribution board etc.), if available *Use Definitions* An IfcElectricDistributionPoint provides a housing for an aggregation of different types of instances of electrical distribution elements so that they can be viewed, operated or acted upon from a single place. Each item in the aggregation may have its own geometric representation and location by virtue of being a subtype of IfcProduct. IfcElectricDistributionPoint acts as the relating object in an IfcRelAggregates relationship, the electrical devices that are brought together being the related objects. *Geometry Use Definitions* The geometric representation of an occurrence of an IfcElectricDistributionPoint is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The local placement is defined in the supertype IfcProduct. It is defined by a subtype of IfcObjectPlacement which can define an absolute placement, relative placement, or grid reference, with each defining the local coordinate system referenced by all geometric representations. The PlacementRelTo relationship of IfcLocalPlacement, if given, shall point to the same IfcSpatialStructureElement which is used in the ContainedInStructure inverse attribute, or to a referenced spatial structure element at a higher level. If the relative placement is not used, the absolute placement is defined within the world coordinate system. Informal propositions for local placement: - If the LocalPlacement is specified, then all aggregated components should use this placement as their relative placement. Standard Geometric Representation Currently, the use of profiles to define the geometry for an occurrence of this class is not supported. The standard geometric representation is defined using explicit geometry. B-Rep Representation The faceted B-Rep capabilities (with or without voids) shall be supported for B-Rep representation.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectricdistributionpoint.htm"
|
|
},
|
|
"IfcElectricFlowStorageDeviceType": {
|
|
"description": "An IfcElectricFlowStorageDeviceType is a device in which electrical energy is stored and from which energy may be progressively released. *Use Definitions* An IfcElectricFlowStorageDeviceType is a subtype of IfcFlowStorageDeviceType that provides for various devices that store electrical energy. Usage of IfcElectricFlowStorageDeviceType defines the parameters for one or more occurrences of IfcFlowStorageDevice. *Property Set Use Definition*: The property sets relating to the IfcElectricFlowStorageDeviceType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcElectricFlowStorageDeviceType are part of this IFC release: - Pset_ElectricalDeviceCommon: property set for properties that are common to all types of electrical devices, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"BATTERY": "A device for storing energy in chemical form so that it can be released as electrical energy.",
|
|
"CAPACITORBANK": "A device that stores electrical energy when an external power supply is present using the electrical property of capacitance.",
|
|
"HARMONICFILTER": "A device that constantly injects currents that precisely correspond to the harmonic components drawn by the load.",
|
|
"INDUCTORBANK": "",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"UPS": "A device that provides a time limited alternative source of power supply in the event of failure of the main supply.",
|
|
"USERDEFINED": "User-defined type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectricflowstoragedevicetype.htm"
|
|
},
|
|
"IfcElectricGeneratorType": {
|
|
"description": "An IfcElectricGeneratorType defines a particular type of engine that is a machine for converting mechanical energy into electrical energy. *Use Definitions,* An IfcElectricGeneratorType is a subtype of IfcEnergyConversionDeviceType that provides for all forms of electric engine. Usage of IfcElectricGeneratorType defines the parameters for one or more occurrences of IfcEnergyConversionDevice. No predefined types of electrical generator are specified at this stage. Use the IfcElectricalGeneratorType.Name and IfcElectricalGeneratorType.Description attributes to further qualify a generator. *Property Set Use Definition*: The property sets relating to the IfcElectricGeneratorType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcElectricGeneratorType are part of this IFC release: - Pset_ElectricalDeviceCommon: property set for properties that are common to all types of electrical devices, if available - Pset_ElectricGeneratorTypeCommon: property set for properties that are common to all types of electrical generator, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"NOTDEFINED": "Undefined type.",
|
|
"USERDEFINED": "User-defined type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectricgeneratortype.htm"
|
|
},
|
|
"IfcElectricHeaterType": {
|
|
"description": "An IfcElectricHeaterType is a device that emits electrical energy as heat. *Use Definitions* An IfcElectricHeaterType is a subtype of IfcEnergyConversionDeviceType that provides for various devices that emit electrical energy as heat. Usage of IfcElectricHeaterType defines the parameters for one or more occurrences of IfcEnergyConversionDevice. Parameters are specified through property sets that are enumerated in the IfcElectricHeaterTypeEnum data type. *Property Set Use Definition*: The property sets relating to the IfcElectricHeaterType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcElectricHeaterType are part of this IFC release: - Pset_ElectricalDeviceCommon: property set for properties that are common to all types of electrical devices, if available - Pset_ElectricHeaterTypeElectricalCableHeater: specific property set for the properties of an electrical cable heater emitting heat along its length, if available - Pset_ElectricHeaterTypeElectricalMatHeater: specific property set for the properties of an electrical mat heater emitting heat over its complete coverage area, if available - Pset_ElectricHeaterTypeElectricalPointHeater: specific property set for the properties of an electrical point heater emitting heat at the point of its location, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"ELECTRICCABLEHEATER": "",
|
|
"ELECTRICMATHEATER": "",
|
|
"ELECTRICPOINTHEATER": "",
|
|
"NOTDEFINED": "",
|
|
"USERDEFINED": ""
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectricheatertype.htm"
|
|
},
|
|
"IfcElectricMotorType": {
|
|
"description": "Definition from BS6100 310 5201: An IfcElectricMotorType defines a particular type of engine that is a machine for converting electrical energy into mechanical energy. *Use Definitions* An IfcElectricMotorType is a subtype of IfcEnergyConversionDeviceType that provides for all forms of electric motor. Usage of IfcElectricMotorType defines the parameters for one or more occurrences of IfcEnergyConversionDevice. *Property Set Use Definition*: The property sets relating to the IfcElectricMotorType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcElectricMotorType are part of this IFC release: - Pset_ElectricalDeviceCommon: property set for properties that are common to all types of electrical devices, if available - Pset_ElectricMotorTypeCommon: property set for properties that are common to all types of electrical motor, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"DC": "A motor using either generated or rectified Direct Current (DC) power.",
|
|
"INDUCTION": "An alternating current motor in which the primary winding on one member (usually the stator) is connected to the power source and a secondary winding or a squirrel-cage secondary winding on the other member (usually the rotor) carries the induced current. There is no physical electrical connection to the secondary winding, its current is induced.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"POLYPHASE": "A two or three-phase induction motor in which the windings, one for each phase, are evenly divided by the same number of electrical degrees.",
|
|
"RELUCTANCESYNCHRONOUS": "A synchronous motor with a special rotor design which directly lines the rotor up with the rotating magnetic field of the stator, allowing for no slip under load.",
|
|
"SYNCHRONOUS": "A motor that operates at a constant speed up to full load. The rotor speed is equal to the speed of the rotating magnetic field of the stator; there is no slip.",
|
|
"USERDEFINED": "User-defined type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectricmotortype.htm"
|
|
},
|
|
"IfcElectricTimeControlType": {
|
|
"description": "An IfcElectricTimeControlType is a device that applies control to the provision or flow of electrical energy over time. *Use Definitions* An IfcElectricTimeControlType is a subtype of IfcFlowControllerType. Usage of IfcElectricTimeControlType defines the parameters for one or more occurrences of IfcFlowController. *Property Set Use Definition*: The property sets relating to the IfcElectricTimeControlType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcElectricTimeControlType are part of this IFC release: - Pset_ElectricalDeviceCommon: property set for properties that are common to all types of electrical devices, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"NOTDEFINED": "Undefined type.",
|
|
"RELAY": "Electromagnetically operated contactor for making or breaking a control circuit.",
|
|
"TIMECLOCK": "A control that causes action to occur at set times.",
|
|
"TIMEDELAY": "A control that causes action to occur following a set duration.",
|
|
"USERDEFINED": "User-defined type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectrictimecontroltype.htm"
|
|
},
|
|
"IfcElectricalBaseProperties": {
|
|
"attributes": {
|
|
"ElectricCurrentType": "Type of electrical current applied",
|
|
"FullLoadCurrent": "Full load electrical current requirements.",
|
|
"InputFrequency": "Nominal frequency of input voltage wave form.",
|
|
"InputPhase": "Relative phase of input conductors",
|
|
"InputVoltage": "Input electrical potential",
|
|
"MaximumPowerInput": "Maximum power input of the electrical device",
|
|
"MinimumCircuitCurrent": "Minimum current carrying capacity of the electrical circuit.",
|
|
"RatedPowerInput": "Actual electrical input power of the electrical device at its rated capacity"
|
|
},
|
|
"description": "Common definition to capture basic electrical characteristics for use in building services and facilities management.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcelectricalbaseproperties.htm"
|
|
},
|
|
"IfcElectricalCircuit": {
|
|
"description": "An IfcElectricalCircuit defines a particular type of system that is for the purpose of distributing electrical power. *Use Definitions* Usage of IfcElectricalCircuit is as for the supertype IfcSystem *Property Set Use Definition*: The property sets relating to the IfcElectricalCircuit_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcElectricalCircuit are part of this IFC release: - Pset_ElectricalCircuit: common property set for the properties of an electrical circuit (as a subtype of IfcSystem), if available *Geometry Use Definitions* There is no geometric definition for a system or subtype of system. Geometry use is determined by the elements that are grouped within the system.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectricalcircuit.htm"
|
|
},
|
|
"IfcElectricalElement": {
|
|
"description": "Generalization of all electrical related objects.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcelectricalelement.htm"
|
|
},
|
|
"IfcElement": {
|
|
"attributes": {
|
|
"ConnectedFrom": "Reference to the element connection relationship. The relationship then refers to the other element that is connected to this element.",
|
|
"ConnectedTo": "Reference to the element connection relationship. The relationship then refers to the other element to which this element is connected to.",
|
|
"ContainedInStructure": "Containment relationship to the spatial structure element, to which the element is primarily associated.",
|
|
"FillsVoids": "Reference to the Fills Relationship that puts the Element into the Opening within another Element.",
|
|
"HasCoverings": "Reference to _IfcCovering_ by virtue of the objectified relationship _IfcRelCoversBldgElement_. It defines the concept of an element having coverings attached.",
|
|
"HasOpenings": "Reference to the Voids Relationship that creates an opening in an element. An element can incorporate zero-to-many openings.",
|
|
"HasPorts": "Reference to the element to port connection relationship. The relationship then refers to the port which is contained in this element.",
|
|
"HasProjections": "Projection relationship that adds a feature (using a Boolean union) to the _IfcBuildingElement_.",
|
|
"HasStructuralMember": "",
|
|
"IsConnectionRealization": "Reference to the connection relationship with realizing element. The relationship then refers to the realizing element which provides the physical manifestation of the connection relationship.",
|
|
"ProvidesBoundaries": "Reference to Space Boundaries by virtue of the objectified relationship IfcRelSeparatesSpaces. It defines the concept of an Building Element bounding Spaces.",
|
|
"ReferencedInStructures": "Reference relationship to the spatial structure element, to which the element is additionally associated.",
|
|
"Tag": "The tag (or label) identifier at the particular instance of a product, e.g. the serial number, or the position number. It is the identifier at the occurrence level."
|
|
},
|
|
"description": "Generalization of all components that make up an AEC product. Those elements can be logically contained by a spatial structure element that constitutes a certain level within a project structure hierarchy (e.g., site, building, storey or space). This is done by using the IfcRelContainedInSpatialStructure relationship. Elements are physically existent objects, although they might be void elements, such as holes. Elements either remain permanently in the AEC product, or only temporarily, as formwork does. Elements can be either assembled on site or pre-manufactured and built in on site. An element can have material and quantity information assigned through the IfcRelAssociatesMaterial and IfcRelDefinesByProperties relationship. In addition an element can be declared to be a specific occurrence of an element type (and thereby be defined by the element type properties) using the IfcRelDefinesByType relationship. An element can also be defined as an element assembly that is a group of semantically and topologically related elements that form a higher level part of the AEC product. Those element assemblies are defined by virtue of the IfcRelAggregates relationship. Elements that performs the same function may be grouped by an \"Element Group By Function\". It is realized by an instance of IfcGroup with the ObjectType = 'ElementGroupByFunction\". *Property Set Use Definition*: The property sets relating to the IfcElement are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcElement are part of this IFC release: - Pset_Draughting: common property set for elements introduced to handle the assignment of CAD related information (here layer name and object colour). IFC2x3 CHANGE The use of this property set is deprecated from IFC2x3 onwards, curve colours are handled by IfcCurveStyle, and layer assignment are handled by IfcPresentationLayerAssignment. - Pset_QuantityTakeOff: common property set for elements introduced to handle additional description of quantity take off. - Pset_ElementShading: common property set for elements that have shading properties to be used in energy calculations or simulations *Quantity Use Definition*: The quantities relating to the IfcElement are defined by the IfcElementQuantity and attached by the IfcRelDefinesByProperties. A detailed specification for individual quantities is introduced at the level of subtypes of IfcElement. *Geometry Use Definitions* The geometric representation of any IfcElement is given by the IfcProductDefinitionShape and IfcLocalPlacement allowing multiple geometric representations. A detailed specification for the shape representation is introduced at the level of subtypes of IfcElement.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcelement.htm"
|
|
},
|
|
"IfcElementAssembly": {
|
|
"attributes": {
|
|
"AssemblyPlace": "A designation of where the assembly is intended to take place defined by an Enum."
|
|
},
|
|
"description": "A container class that represents complex element assemblies aggregated from several elements, such as discrete elements, building elements, or other elements. *Containment Use Definition* The IfcElementAssembly should have (and in most implementation scenarios it is mandatory) a relationship for its hierarchical containment in the spatial structure of the project. - The IfcElementAssembly is placed within the project spatial hierarchy using the objectified relationship IfcRelContainedInSpatialStructure, referring to it by its inverse attribute SELF\\IfcElement.ContainedInStructure. Subtypes of IfcSpatialStructureElement are valid spatial containers, with IfcBuildingStorey being the default container. The IfcElementAssembly shall represent an aggregate, i.e. it should have other elements, being subtypes of IfcElement, as contained (sub)parts. - The IfcElementAssembly is an aggregate i.e. being composed by other elements and acting as an assembly using the objectified relationship IfcRelAggregates, referring to it by its inverse attribute SELF\\IfcObjectDefinition.IsDecomposedBy. Components of an assembly are described by instances of subtypes of IfcElement. - In this case, the contained subtypes of IfcElement shall not be additionally contained in the project spatial hierarchy, i.e. the inverse attribute SELF\\IfcElement.ContainedInStructure of those IfcElement's shall be NIL. *Geometry Use Definitions* The geometric representation of IfcElementAssembly is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Local Placement The local placement for IfcElementAssembly is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. *Geometric Representations* The geometry of an IfcElementAssembly is generally formed from its components, in which case it does not need to have an explicit geometric representation. In some cases it may be useful to also expose a simple explicit representation as a bounding box representation of the complex composed shape independently. Informal proposition - The IfcElementAssembly shall have an aggregation relationship to the contained parts, i.e. the (INV) IsDecomposedBy relationship shall be utilized.",
|
|
"predefined_types": {
|
|
"ACCESSORY_ASSEMBLY": "Assembled accessories or components.",
|
|
"ARCH": "A curved structure.",
|
|
"BEAM_GRID": "Interconnected beams, located in one (typically horizontal) plane.",
|
|
"BRACED_FRAME": "A rigid frame with additional bracing members.",
|
|
"GIRDER": "A beam-like superstructure.",
|
|
"NOTDEFINED": "Undefined element assembly.",
|
|
"REINFORCEMENT_UNIT": "Assembled reinforcement elements.",
|
|
"RIGID_FRAME": "A structure built up of beams, columns, etc. with moment-resisting joints.",
|
|
"SLAB_FIELD": "Slabs, laid out in one plane.",
|
|
"TRUSS": "A structure built up of members with (quasi) pinned joint.",
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|
"USERDEFINED": "User-defined element assembly."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcelementassembly.htm"
|
|
},
|
|
"IfcElementComponent": {
|
|
"description": "An element component is a representation for minor items included in, added to or connecting to or between elements, which usually are not of interest from the overall building structure viewpoint. However, these small parts may have vital and load carrying functions within the construction. These items do not provide any actual space boundaries. Typical examples of _IfcElementComponent_s include different kinds of fasteners and various accessories. Geometry Use Definitions: The geometric representation of IfcElementComponent is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The local placement for IfcElementComponent is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcElement or IfcElementAssembly, which is used in the Decomposes inverse attribute, i.e. the local placement is defined relative to the local placement of the element or element assembly in which the component is contained. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Surface Model Representation Any IfcElementComponent (if no further constraints are defined at the level of its subtypes) may be represented as a single or multiple surface models, based on either shell or face based models. It is ensured by assigning the value 'SurfaceModel' to the RepresentationType attribute of IfcShapeRepresentation. In some cases it may be useful to also expose a simple representation as a bounding box representation of the same complex shape. Brep Representation Any IfcElementComponent (if no further constraints are defined at the level of its subtypes) may be represented as a single or multiple Boundary Representation elements (which are restricted to faceted Brep with or without voids). The Brep representation allows for the representation of complex element shape. It is ensured by assigning the value 'Brep' to the RepresentationType attribute of IfcShapeRepresentation. In some cases it may be useful to also expose a simple representation as a bounding box representation of the same complex shape. Mapped Representation The mapped item, IfcMappedItem, should be used if appropriate as it allows for reusing the geometry definition of the equipment type at occurrences of the same equipement type. In this case the IfcShapeRepresentation.RepresentationType = 'MappedRepresentation' is used.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcelementcomponent.htm"
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|
},
|
|
"IfcElementComponentType": {
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|
"description": "The element type (IfcElementComponentType) represents the supertype for element types which define lists of commonly shared property set definitions of various small parts and accessories and an optional set of product representations. It is used to define a supporting element mainly within structural and building services domains (i.e. the specific type information common to all occurrences of that type).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcelementcomponenttype.htm"
|
|
},
|
|
"IfcElementQuantity": {
|
|
"attributes": {
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|
"MethodOfMeasurement": "Name of the method of measurement used to calculate the element quantity. The method of measurement attribute has to be made recognizable by further agreements.",
|
|
"Quantities": "The individual quantities for the element, can be a set of length, area, volume, weight or count based quantities."
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|
},
|
|
"description": "An IfcElementQuantity defines a set of derived measures of an element's physical property. Elements could be spatial structure elements (like buildings, storeys, or spaces) or building elements (like walls, slabs, finishes). The IfcElementQuantity gets assigned to the element by using the IfcRelDefinesByProperties relationship. The optional MethodOfMeasurement attribute defines the code, e.g. from a standard method of measurement, which had been used to calculate the element quantity. The name attribute, given at the individual Quantities provides a recognizable semantic meaning of the element quantity. Both information is needed to establish a precise meaning for the measure value. An optional description may be assigned to each of the Quantities. All quantities assigned by a single instance of IfcElementQuantity are deemed to have been generated according to the same method of measurement. However several instances of IfcElementQuantity are assignable to an element, thus allowing for an element having quantities generated according to several methods of measurement. The IfcElementQuantity can have the following subtypes of IfcPhysicalQuantity within its SET of Quantities, which count for the basis measure types used: - count measure - weight measure - length measure - area measure - volume measure - time measure",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcelementquantity.htm"
|
|
},
|
|
"IfcElementType": {
|
|
"attributes": {
|
|
"ElementType": "The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute 'PredefinedType' is set to USERDEFINED."
|
|
},
|
|
"description": "The IfcElementType defines a list of commonly shared property set definitions of an element and an optional set of product representations. It is used to define an element specification (i.e. the specific product information, that is common to all occurrences of that product type). An element type is used to define the common properties of a certain type or style of an element that may be applied to instances of that element type to assign a specific style. Element types (the instantiable subtypes) may be exchanged without being already assigned to occurrences.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcelementtype.htm"
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|
},
|
|
"IfcElementarySurface": {
|
|
"attributes": {
|
|
"Dim": "The space dimensionality of this class, derived from the dimensionality of the Position. Position.Dim",
|
|
"Position": "The position and orientation of the surface. This attribute is used in the definition of the parameterization of the surface."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: An elementary surface (IfcElementarySurface) is a simple analytic surface with defined parametric representation.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcelementarysurface.htm"
|
|
},
|
|
"IfcEllipse": {
|
|
"attributes": {
|
|
"SemiAxis1": "The first radius of the ellipse which shall be positive. Placement.Axes[1] gives the direction of the SemiAxis1.",
|
|
"SemiAxis2": "The second radius of the ellipse which shall be positive."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: An ellipse (IfcEllipse) is a conic section defined by the lengths of the semi-major and semi-minor diameters and the position (center or mid point of the line joining the foci) and orientation of the curve. Interpretation of the data shall be as follows: Illustration:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcellipse.htm"
|
|
},
|
|
"IfcEllipseProfileDef": {
|
|
"attributes": {
|
|
"SemiAxis1": "The first radius of the ellipse. It is measured along the direction of Position.P[1].",
|
|
"SemiAxis2": "The second radius of the ellipse. It is measured along the direction of Position.P[2]."
|
|
},
|
|
"description": "Definition from IAI: The IfcEllipseProfileDef defines an ellipse as the profile definition used by the swept surface geometry or the swept area solid. It is given by its semi axis attributes and placed within the 2D position coordinate system, established by the Position attribute. Illustration: Table: Parameter for ellipse profile definition",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcellipseprofiledef.htm"
|
|
},
|
|
"IfcEnergyConversionDevice": {
|
|
"description": "The distribution flow element IfcEnergyConversionDevice defines the occurrence of a device used to perform energy conversion or heat transfer and typically participates in a flow distribution system. Its type is defined by IfcEnergyConversionDeviceType or its subtypes. IfcEnergyConversionDevice is a container entity that aggregates all components of the device it represents. The aggregation is handled via the IfcRelAggregates relationship. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DistributionFlowElementCommon: common property set for distribution flow element occurrences - Pset_EnergyConversionDeviceCoil: property set for coil energy conversion device occurrences - Pset_EnergyConversionDeviceSpaceHeaterPanel: property set for panel space heater energy conversion device occurrences - Pset_EnergyConversionDeviceSpaceHeaterSectional: property set for sectional space heater energy conversion device occurrences Geometry Use Definitions The geometric representation of IfcEnergyConversionDevice is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcDistributionFlowElement. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcDistributionFlowElement.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcenergyconversiondevice.htm"
|
|
},
|
|
"IfcEnergyConversionDeviceType": {
|
|
"description": "The element type IfcEnergyConversionType defines a list of commonly shared property set definitions of an energy conversion device and an optional set of product representations. It is used to define an energy conversion device specification (i.e. the specific product information, that is common to all occurrences of that product type). A energy conversion type is used to define the common properties of a energy conversion device that may be applied to many occurrences of that type. An energy conversion device is a building systems device that converts energy from one form into another such as a boiler (i.e., combusting gas to heat water), chiller (i.e., using a refrigeration cycle to cool a liquid), or a cooling coil (i.e., using the phase-change characteristics of a refrigerant to cool air). Energy conversion types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcEnergyConversionType are represented by instances of IfcEnergyConversion or its subtypes.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcenergyconversiondevicetype.htm"
|
|
},
|
|
"IfcEnergyProperties": {
|
|
"attributes": {
|
|
"EnergySequence": "",
|
|
"UserDefinedEnergySequence": "This attribute must be defined if the EnergySequence is USERDEFINED."
|
|
},
|
|
"description": "Common definition to capture the properties of an energy source typically used within the context of building services. IfcEnergyProperties is a statically defined property set and should be attached to the instance(s) of IfcDistributionFlowElement through the IfcRelDefinesByProperties relationship.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcenergyproperties.htm"
|
|
},
|
|
"IfcEnvironmentalImpactValue": {
|
|
"attributes": {
|
|
"Category": "The category into which the environmental impact value falls.",
|
|
"ImpactType": "Specification of the environmental impact type to be referenced.",
|
|
"UserDefinedCategory": "A user defined value category into which the environmental impact value falls."
|
|
},
|
|
"description": "An IfcEnvironmentalImpactValue is an amount or measure of an environmental impact or a value that affects an amount or measure of an environmental impact. The IfcEnvironmentalImpactValue contains the value of the environmental impact. For example this could represent the volume of carbon dioxide emission, amount of operational energy or mass of aluminum used in a product. Each instance of IfcEnvironmentalImpactValue may also have an ImpactType. There are many possible types of environmental impact value that may be identified. To allow for any type of environmental impact value, the IfcLabel datatype is assigned. The following defines some impact types that might be applied: Where a formal standard is not used, it is recommended that local agreements should be made to define allowable and understandable impact value types within a project or region.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccostresource/lexical/ifcenvironmentalimpactvalue.htm"
|
|
},
|
|
"IfcEquipmentElement": {
|
|
"description": "Generalization of all equipment related objects, those objects are characterized as being pre-manufactured and being movable, and which provide some building service related or other servicing function. The term fixture is often used as a synonym or similar concept. The IfcEquipmentElement covers the fixture aspect as well. Geometry Use Definitions: The geometric representation of IfcEquipmentElement is given by the IfcProductDefinitionShape, allowing multiple geometric representation. Local Placement The local placement for IfcEquipmentElement is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement , which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. SurfaceModel Representation Any IfcEquipmentElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple surface models, based on either shell or face based models. It is ensured by assigning the value 'SurfaceModel' to the RepresentationType attribute of IfcShapeRepresentation. In some cases it may be useful to also expose a simple representation as a bounding box representation of the same complex shape. Brep Representation Any IfcEquipmentElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple Boundary Representation elements (which are restricted to faceted Brep with or without voids). The Brep representation allows for the representation of complex element shape. It is ensured by assigning the value 'Brep' to the RepresentationType attribute of IfcShapeRepresentation. In some cases it may be useful to also expose a simple representation as a bounding box representation of the same complex shape. MappedRepresentation The new mapped item, IfcMappedItem, should be used if appropriate as it allows for reusing the geometry definition of the equipment type at occurrences of the same equipment type. In this case the IfcShapeRepresentation.RepresentationType = MappedRepresentation is used.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcequipmentelement.htm"
|
|
},
|
|
"IfcEquipmentStandard": {
|
|
"description": "An IfcEquipmentStandard is a standard for equipment allocation that can be assigned to persons within an organization. An IfcEquipmentStandard is assigned a set of classification notations (through the IfcRelAssociatesClassification class within the IfcKernel schema) that determine the types of equipment that fulfill the requirements of the standard. In order to use the equipment standard class, a classification of equipment items must have been established. This does not mean that each individual equipment item needs to have a classification notation although this is considered to be desirable. Examples of equipment items that might fall within an equipment standard include number and type PC's and connections, task lighting, pictures etc. An equipment standard is assigned to one or several persons or organizations (like a work group or department) through the IfcRelAssignsToControl relationship via the Controls inverse attribute.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcequipmentstandard.htm"
|
|
},
|
|
"IfcEvaporativeCoolerType": {
|
|
"description": "The element type IfcEvaporativeCoolerType defines a list of commonly shared property set definitions of an evaporative cooler and an optional set of product representations. It is used to define an evaporative cooler specification (i.e. the specific product information, that is common to all occurrences of that product type). A evaporative cooler type is used to define the common properties of a evaporative cooler that may be applied to many occurrences of that type. An evaporative cooler is a device that cools air by saturating it with water vapor. Evaporative cooler types may be exchanged without being already assigned to occurrences. The occurrences of the IfcEvaporativeCoolerType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_EvaporativeCoolerTypeCommon: common property set for all evaporative cooler types",
|
|
"predefined_types": {
|
|
"DIRECTEVAPORATIVEAIRWASHER": "Direct evaporative air washer: Cools the air stream by evaporating water dircectly into the air stream using coolers with spray-type air washer consist of a chamber or casing containing spray nozzles, and tank for collecting spray water, and an eliminator section for removing entrained drops of water from the air.",
|
|
"DIRECTEVAPORATIVEPACKAGEDROTARYAIRCOOLER": "Direct evaporative packaged rotary air cooler: Cools the air stream by evaporating water dircectly into the air stream using coolers that wet and wash the evaporative pad by rotating it through a water bath.",
|
|
"DIRECTEVAPORATIVERANDOMMEDIAAIRCOOLER": "Direct evaporative random media air cooler: Cools the air stream by evaporating water dircectly into the air stream using coolers with evaporative pads, usually of aspen wood or plastic fiber/foam.",
|
|
"DIRECTEVAPORATIVERIGIDMEDIAAIRCOOLER": "Direct evaporative rigid media air cooler: Cools the air stream by evaporating water dircectly into the air stream using coolers with sheets of rigid, corrugated material as the wetted surface.",
|
|
"DIRECTEVAPORATIVESLINGERSPACKAGEDAIRCOOLER": "Direct evaporative slingers packaged air cooler: Cools the air stream by evaporating water dircectly into the air stream using coolers with a water slinger in an evaporative cooling section and a fan section.",
|
|
"INDIRECTDIRECTCOMBINATION": "Indirect/Direct combination: Cools the air stream by evaporating water indirectly and without adding moisture into the air stream using a two-stage cooler with a first-stage indirect evaporative cooler and second-stage direct evaporative cooler.",
|
|
"INDIRECTEVAPORATIVECOOLINGTOWERORCOILCOOLER": "Indirect evaporative cooling tower or coil cooler: Cools the air stream by evaporating water indirectly and without adding moisture into the air stream using a combination of a cooling tower or other evaporative water cooler with a water-to-air heat exchanger coil and water circulating pump.",
|
|
"INDIRECTEVAPORATIVEPACKAGEAIRCOOLER": "Indirect evaporative package air cooler: Cools the air stream by evaporating water indirectly and without adding moisture into the air stream. On one side of the heat exchanger, the secondary air stream is cooled by evaporation, while on the other side of heat exchanger, the primary air stream (conditioned air to be supplied to the room) is sensibly cooled by the heat exchanger surfaces.",
|
|
"INDIRECTEVAPORATIVEWETCOIL": "Indirect evaporative wet coil: Cools the air stream by evaporating water indirectly and without adding moisture into the air stream. Water is sprayed directly on the tubes of the heat exchanger where latent cooling takes place and the vaporization of the water on the outside of the heat exchanger tubes allows the simultaneous heat and mass transfer which removes heat from the supply air on the tube side.",
|
|
"NOTDEFINED": "Undefined evaporative cooler type.",
|
|
"USERDEFINED": "User-defined evaporative cooler type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcevaporativecoolertype.htm"
|
|
},
|
|
"IfcEvaporatorType": {
|
|
"description": "The element type IfcEvaporatorType defines a list of commonly shared property set definitions of an evaporator and an optional set of product representations. It is used to define an evaporator specification (i.e. the specific product information, that is common to all occurrences of that product type). A evaporator type is used to define the common properties of an evaporator that may be applied to many occurrences of that type. An evaporator is a device in which a liquid refrigerent is vaporized and absorbs heat from the surrounding fluid. Evaporator types may be exchanged without being already assigned to occurrences. The occurrences of the IfcEvaporatorType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_EvaporatorTypeCommon: common property set for all evaporator types",
|
|
"predefined_types": {
|
|
"DIRECTEXPANSIONBRAZEDPLATE": "Direct-expansion evaporator where a refrigerant evaporates inside plates brazed or welded together to make up an assembly of separate channels.",
|
|
"DIRECTEXPANSIONSHELLANDTUBE": "Direct-expansion evaporator where a refrigerant evaporates inside a series of baffles that channel the fluid throughout the shell side.",
|
|
"DIRECTEXPANSIONTUBEINTUBE": "Direct-expansion evaporator where a refrigerant evaporates inside one or more pairs of coaxial tubes.",
|
|
"FLOODEDSHELLANDTUBE": "Evaporator in which refrigerant evaporates outside tubes.",
|
|
"NOTDEFINED": "Undefined evaporator type.",
|
|
"SHELLANDCOIL": "Evaporator in which refrigerant evaporates inside a simple coiled tube immersed in the fluid to be cooled.",
|
|
"USERDEFINED": "User-defined evaporator type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcevaporatortype.htm"
|
|
},
|
|
"IfcExtendedMaterialProperties": {
|
|
"attributes": {
|
|
"Description": "Description for the set of extended properties.",
|
|
"ExtendedProperties": "The set of material properties defined by user for this material.",
|
|
"Name": "The name given to the set of extended properties."
|
|
},
|
|
"description": "A container class for user defined properties of associated material. This provides a mechanism to assign properties that have not been defined in IFC specification. purposes can be defined as:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcextendedmaterialproperties.htm"
|
|
},
|
|
"IfcExternalReference": {
|
|
"attributes": {
|
|
"ItemReference": "Identifier for the referenced item in the external source (classification, document or library). The internal reference can provide a computer interpretable pointer into electronic source.",
|
|
"Location": "Location, where the external source (classification, document or library). This can be either human readable or computer interpretable. For electronic location normally given as an URL location string, however other ways of accessing external references may be established in an application scenario.",
|
|
"Name": "Optional name to further specify the reference. It can provide a human readable identifier (which does not necessarily need to have a counterpart in the internal structure of the document)."
|
|
},
|
|
"description": "An IfcExternalReference is the identification of information that is not explicitly represented in the current model or in the project database (as an implementation of the current model). Such information may be contained in classifications, documents or libraries. Only the Location (e.g. as an URL) is given to describe the place where the information can be found. Also an optional ItemReference as a key to allow more specific references (as to sections or tables) is provided. The ItemReference defines a system interpretable method to identify the relevant part of information at the data source (given by Location). In addition a human interpretable Name can be assigned to identify the information subject (e.g. classification code). IfcExternalReference is an abstract supertype of all external reference classes. See the use definitions given at the subtypes of IfcExternalReference.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcexternalreference.htm"
|
|
},
|
|
"IfcExternallyDefinedHatchStyle": {
|
|
"description": "Definition from ISO/CD 10303-46:1992: The externally defined hatch style is an entity which makes an external reference to a hatching style.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcexternallydefinedhatchstyle.htm"
|
|
},
|
|
"IfcExternallyDefinedSurfaceStyle": {
|
|
"description": "Definition from IAI: Definition of a surface style through referencing an external source (e.g. a material library for rendering information).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcexternallydefinedsurfacestyle.htm"
|
|
},
|
|
"IfcExternallyDefinedSymbol": {
|
|
"description": "An externally defined symbol is a symbol that gets its shape information by an agreed reference to an external source.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcexternallydefinedsymbol.htm"
|
|
},
|
|
"IfcExternallyDefinedTextFont": {
|
|
"description": "Definition from ISO/CD 10303-46:1992: The externally defined text font is an external reference to a text font",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifcexternallydefinedtextfont.htm"
|
|
},
|
|
"IfcExtrudedAreaSolid": {
|
|
"attributes": {
|
|
"Depth": "The distance the surface is to be swept.",
|
|
"ExtrudedDirection": "The direction in which the surface is to be swept."
|
|
},
|
|
"description": "The extruded area solid (IfcExtrudedAreaSolid) is defined by sweeping a bounded planar surface. The direction of the extrusion is given by the ExtrudedDirection attribute and the length of the extrusion is given by the Depth attribute. If the planar area has inner boundaries, i.e. holes defined, then those holes shall be swept into holes of the solid. The ExtrudedDirection is given within the position coordinate system as defined by IfcSweptAreaSolid.Position. Extrusions are not longer restricted to be perpendicular to the extruded surface of the profile. Illustration:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcextrudedareasolid.htm"
|
|
},
|
|
"IfcFace": {
|
|
"attributes": {
|
|
"Bounds": "Boundaries of the face."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A face is a topological entity of dimensionality 2 corresponding to the intuitive notion of a piece of surface bounded by loops. Its domain, if present, is an oriented, connected, finite 2-manifold in R^m^. A face domain shall not have handles but it may have holes, each hole bounded by a loop. The domain of the underlying geometry of the face, if present, does not contain its bounds, and 0 < \u039e < \u221e. A face is represented by its bounding loops, which are defined as face bounds. A face has a topological normal n and the tangent to a loop is t. For a loop bounding a face with defined geometry, the cross product n x t points toward the interior of the face. That is, each loop runs counter-clockwise around the face when viewed from above, if we consider the normal n to point up. With each loop is associated a BOOLEAN flag to signify whether the loop direction is oriented with respect to the face normal (TRUE) or should be reversed (FALSE). A face shall have at least one bound, and the loops shall not intersect. One loop is optionally distinguished as the outer loop of the face. If so, it establishes a preferred way of embedding the face domain in the plane, in which the other bounding loops of the face are inside the outer bound. Because the face domain is arcwise connected, no inner loop will contain any other loop. This is true regardless of which embedding in the plane is chosen. The edges and vertices referenced by the loops of a face form a graph, of which the individual loops are the connected components. The Euler equation (1) for this graph becomes: Informal propositions: - No edge shall be referenced by the face more than twice. - Distinct face bounds of the face shall have no common vertices. - If geometry is present, distinct loops of the same face shall not intersect. - The face shall satisfy the Euler Equation: (number of vertices) - (number of edges) - (number of loops) + (sum of genus for loops) = 0.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcface.htm"
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},
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|
"IfcFaceBasedSurfaceModel": {
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"attributes": {
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"Dim": "The space dimensionality of this class, it is always 3. 3",
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|
"FbsmFaces": "The set of connected face sets comprising the face based surface model."
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},
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|
"description": "Definition from ISO/CD 10303-42:1992: A face based surface model is described by a set of connected face sets of dimensionality 2. The connected face sets shall not intersect except at edges and vertices, except that a face in one connected face set may overlap a face in another connected face set, provided the face boundaries are identical. There shall be at least one connected face set. A connected face set may exist independently of a surface model. Informal propositions: - The connected face sets shall not overlap or intersect except at common faces, edges or vertices. - The fbsm faces have dimensionality 2.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcfacebasedsurfacemodel.htm"
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},
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|
"IfcFaceBound": {
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"attributes": {
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"Bound": "The loop which will be used as a face boundary.",
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"Orientation": "This indicated whether (TRUE) or not (FALSE) the loop has the same sense when used to bound the face as when first defined. If sense is FALSE the senses of all its component oriented edges are implicitly reversed when used in the face."
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|
},
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|
"description": "Definition from ISO/CD 10303-42:1992: A face bound is a loop which is intended to be used for bounding a face.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcfacebound.htm"
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},
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"IfcFaceOuterBound": {
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|
"description": "Definition from ISO/CD 10303-42:1992: A face outer bound is a special subtype of face bound which carries the additional semantics of defining an outer boundary on the face. No more than one boundary of a face shall be of this type.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcfaceouterbound.htm"
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},
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"IfcFaceSurface": {
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"attributes": {
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"FaceSurface": "The surface which defines the internal shape of the face. This surface may be unbounded. The domain of the face is defined by this surface and the bounding loops in the inherited attribute SELF\\FaceBounds.",
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"SameSense": "This flag indicates whether the sense of the surface normal agrees with (TRUE), or opposes (FALSE), the sense of the topological normal to the face."
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},
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"description": "Definition from ISO/CD 10303-42:1992: A face surface (IfcFaceSurface) is a subtype of face in which the geometry is defined by an associated surface. The portion of the surface used by the face shall be embeddable in the plane as an open disk, possibly with holes. However, the union of the face with the edges and vertices of its bounding loops need not be embeddable in the plane. It may, for example, cover an entire sphere or torus. As both a face and a geometric surface have defined normal directions, a BOOLEAN flag (the orientation attribute) is used to indicate whether the surface normal agrees with (TRUE) or is opposed to (FALSE) the face normal direction. The geometry associated with any component of the loops of the face shall be consistent with the surface geometry, in the sense that the domains of all the vertex points and edge curves are contained in the face geometry surface. A surface may be referenced by more than one face surface. Informal propositions: - The domain of the face surface is formally defined to be the domain of its face geometry as trimmed by the loops, this domain does not include the bounding loops. - A face surface has non zero finite extent. - A face surface is a manifold. - A face surface is arcwise connected. - A face surface has surface genus 0. - The loops are not part of the face domain. - Loop geometry shall be consistent with face geometry. This implies that any edge - curves or vertex points used in defining the loops bounding the face surface shall lie on the face geometry. - The loops of the face shall not intersect.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcfacesurface.htm"
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},
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"IfcFacetedBrep": {
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"description": "Definition from ISO/CD 10303-42:1992: A faceted brep is a simple form of boundary representation model in which all faces are planar and all edges are straight lines. Unlike the B-rep model, edges and vertices are not represented explicitly in the model but are implicitly available through the poly loop entity. A faceted B-rep has to meet the same topological constraints as the manifold solid Brep. Informal proposition: - All the bounding loops of all the faces of all the shells in the IfcFacetedBrep shall be of type IfcPolyLoop.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcfacetedbrep.htm"
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},
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|
"IfcFacetedBrepWithVoids": {
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|
"attributes": {
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"Voids": "Set of closed shells defining voids within the solid."
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|
},
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"description": "The IfcFacetedBrepWithVoids is a specialization of a faceted B-rep which contains one or more voids in its interior. The voids are represented as closed shells which are defined so that the shell normal point into the void. Informal propositions: - Each void shell shall be disjoint from the outer shell and from every other void shell - Each void shell shall be enclosed within the outer shell but not within any other void shell. In particular the outer shell is not in the set of void shells - Each shell in the IfcManifoldSolidBrep shall be referenced only once. - All the bounding loops of all the faces of all the shells in the IfcFacetedBrep shall be of type IfcPolyLoop.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcfacetedbrepwithvoids.htm"
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|
},
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|
"IfcFailureConnectionCondition": {
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|
"attributes": {
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|
"CompressionFailureX": "Compression force in x-direction leading to failure of the connection.",
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|
"CompressionFailureY": "Compression force in y-direction leading to failure of the connection.",
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|
"CompressionFailureZ": "Compression force in z-direction leading to failure of the connection.",
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|
"TensionFailureX": "Tension force in x-direction leading to failure of the connection.",
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|
"TensionFailureY": "Tension force in y-direction leading to failure of the connection.",
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|
"TensionFailureZ": "Tension force in z-direction leading to failure of the connection."
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|
},
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|
"description": "Instances of the entity IfcFailureConnectionCondition shall be used to describe connection properties needed to specify the failure of a connection.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcfailureconnectioncondition.htm"
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|
},
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|
"IfcFanType": {
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|
"description": "The element type IfcFanType defines a list of commonly shared property set definitions of a fan and an optional set of product representations. It is used to define a fan specification (i.e. the specific product information, that is common to all occurrences of that product type). A Fan type is used to define the common properties of a fan that may be applied to many occurrences of that type. A fan is a device which imparts mechanical work on a gas. A typical usage of a fan is to induce airflow in a building services air distribution system. Fan types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcFanType are represented by instances of IfcFlowMovingDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_FanTypeCommon: common property set for all fan types Pset_FanTypeSmokeControl: property set for all fan types that are part of a smoke control system",
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|
"predefined_types": {
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|
"CENTRIFUGALAIRFOIL": "Air flows through the impeller radially using blades that are airfoil shaped.",
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|
"CENTRIFUGALBACKWARDINCLINEDCURVED": "Air flows through the impeller radially using blades that are backward curved.",
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|
"CENTRIFUGALFORWARDCURVED": "Air flows through the impeller radially using blades that are forward curved.",
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|
"CENTRIFUGALRADIAL": "Air flows through the impeller radially using blades that are uncurved or slightly forward curved.",
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|
"NOTDEFINED": "Undefined fan type.",
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|
"PROPELLORAXIAL": "Air flows through the impeller axially and small hub-to-tip ratio impeller mounted in an orifice plate or inlet ring.",
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|
"TUBEAXIAL": "Air flows through the impeller axially with guide vanes and reduced running blade tip clearance.",
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|
"USERDEFINED": "User-defined fan type.",
|
|
"VANEAXIAL": "Air flows through the impeller axially with guide vanes and reduced running blade tip clearance."
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|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcfantype.htm"
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|
},
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"IfcFastener": {
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|
"description": "Representations of fixing parts which are used as fasteners to connect or join elements with other elements. General usage The exact type information of the IfcFastener is given in the ObjectType attribute inherited from IfcObject. Standard type designations are provided for guideline below. Note that mechanical fasteners are represented by instances of the subtype IfcMechanicalFastener. Geometry Use Definitions: The geometric representation of IfcFastener is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined in the supertype IfcElementComponent. Standard Geometric Representation The use of Standard Geometric Representations is defined in the supertype IfcElementComponent.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcfastener.htm"
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|
},
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|
"IfcFastenerType": {
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|
"description": "The element type (IfcFastenerType) defines a list of commonly shared property set definitions of a fastener and an optional set of product representations. It is used to define fasteners mainly within structural and building services domains (i.e. the specific type information common to all occurrences of that type). The occurrences of the IfcFastenerType are represented by instances of IfcFastener. General usage The exact type information of the IfcFastenerType is given in the ElementType attribute inherited from IfcElementType. Standard type designations are provided for guideline below. Note that mechanical fastener types are represented by instances of the subtype IfcMechanicalFastenerType.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcfastenertype.htm"
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|
},
|
|
"IfcFeatureElement": {
|
|
"description": "Generalization of all existence dependent elements which modify the shape and appearance of the associated master element. The IfcFeatureElement offers the ability to handle shape modifiers as semantic objects within the IFC object model. In contrary to the aggregation, as used in IfcElementAssembly, that defines the aggregate as a container element, that has equally treated parts, the feature concept introduced by IfcFeatureElement defines the master element with subordinate parts as additions, or with voids or cut-outs as subtractions. *Containment Use Definition* As a subordinate part being fully dependent on the master element the IfcFeatureElement shall have no independent containment relationship to the spatial structure. - The SELF\\IfcElement.ContainedInStructure relationship shall be NIL. *Geometry Use Definition* The geometric representation of IfcFeatureElement is given by the IfcProductDefinitionShape, allowing multiple geometric representation. Local Placement The local placement for IfcFeatureElement is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the master IfcElement (its relevant subtypes), which is associated to the IfcFeatureElement by the appropriate relationship object. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Shape Representation The geometry use definitions for the shape representation of the IfcFeatureElement is given at the level of its subtypes.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcfeatureelement.htm"
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|
},
|
|
"IfcFeatureElementAddition": {
|
|
"attributes": {
|
|
"ProjectsElements": "Reference to the _IfcRelProjectsElement_ relationship that uses this _IfcFeatureElementAddition_ to create a volume addition at an element. The _IfcFeatureElementAddition_ can only be used to create a single addition at a single element using Boolean addition operation."
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|
},
|
|
"description": "A specialization of the general feature element, that represents an existence dependent element which modifies the shape and appearance of the associated master element. The IfcFeatureElementAddition offers the ability to handle shape modifiers as semantic objects within the IFC object model that add to the shape of the master element. The IfcFeatureElementAddition is associated to its master element by virtue of the objectified relationship IfcRelProjectsElement. This relationship implies a Boolean 'union' operation between the shape of the master element and the shape of the addition feature. *Containment use definition* The containment to the spatial structure is defined at the level of the supertype IfcFeatureElement *Geometry Use Definitions* The geometric representation of IfcFeatureElementAddition is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Local Placement The local placement for IfcFeatureElementAddition is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. The local placement is always defined in relation to the local placement of the element to which the feature element is added: - The PlacementRelTo relationship of IfcLocalPlacement shall point to the local placement of the same IfcElement, which is used in the HasAdditionFeature.RelatingElement inverse attribute. Shape Representation The geometry use definitions for the shape representation of the IfcFeatureElementAddition is given at the level of its subtypes.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcfeatureelementaddition.htm"
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|
},
|
|
"IfcFeatureElementSubtraction": {
|
|
"attributes": {
|
|
"VoidsElements": "Reference to the Voids Relationship that uses this Opening Element to create a void within an Element. The Opening Element can only be used to create a single void within a single Element."
|
|
},
|
|
"description": "A specialization of the general feature element, that represents an existence dependent elements which modifies the shape and appearance of the associated master element. The IfcFeatureElementSubtraction offers the ability to handle shape modifiers as semantic objects within the IFC object model that subtract from the shape of the master element. *Containment use definition* The containment to the spatial structure is defined at the level of the supertype IfcFeatureElement *Geometry Use Definitions* The geometric representation of IfcFeatureElementSubtraction is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Local Placement The local placement for IfcFeatureElementSubtraction is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. The local placement is always defined in relation to the local placement of the building element from which the feature element is substracted: - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcElement, which is used in the VoidsElements.RelatingElement inverse attribute. Shape Representation The geometry use definitions for the shape representation of the IfcFeatureElementSubtraction is given at the level of its subtypes.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcfeatureelementsubtraction.htm"
|
|
},
|
|
"IfcFillAreaStyle": {
|
|
"attributes": {
|
|
"FillStyles": "The set of fill area styles to use in presenting visible curve segments, annotation fill areas or surfaces."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: The style for filling visible curve segments, annotation fill areas or surfaces with tiles or hatches. Definition from IAI: An IfcFillAreaStyle provides the style table for presentation information assigned to annotation fill areas or surfaces for hatching and tiling. The IfcFillAreaStyle defines hatches as model hatches, i.e. the distance between hatch lines, or the curve patterns of hatch lines are given in model space dimensions (that have to be scaled using the target plot scale). The IfcFillAreaStyle allows for the following combinations of defining the style of hatching and tiling: - Solid fill for areas and surfaces by only assigning IfcColour to the set of FillStyles. It then provides the background colour for the filled area or surface. - Vector based hatching for areas and surfaces based on two (potentially crossing) rows of hatch lines by assigning two instances of IfcFillAreaStyleHatching to the set of FillStyles. If an instance of IfcColour is assigned in addition to the set of FillStyles, it provides the background colour for the hatching. Measures given to a hatch or tile pattern are given in global drawing length units. The measure values for hatch or tile pattern apply to the model space with a target plot scale provided for the correct appearance in the default plot scale. For different scale and projection dependent fill area styles a different instance of IfcFillAreaStyle needs to be used by IfcPresentationStyleAssignment for different IfcGeometricRepresentationSubContext dependent representations. An IfcFillAreaStyle can be assigned to IfcFillArea via the IfcPresentationStyleAssignment through an intermediate IfcStyledItem or subtype IfcAnnotationFillAreaOccurrence.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcfillareastyle.htm"
|
|
},
|
|
"IfcFillAreaStyleHatching": {
|
|
"attributes": {
|
|
"HatchLineAngle": "A plane angle measure determining the direction of the parallel hatching lines.",
|
|
"HatchLineAppearance": "The curve style of the hatching lines. Any curve style pattern shall start at the origin of each hatch line.",
|
|
"PatternStart": "A distance along the reference hatch line which is the start point for the curve style font pattern of the reference hatch line. If not given, the start point of the curve style font pattern is at the (virtual) hatching coordinate system.",
|
|
"PointOfReferenceHatchLine": "A Cartesian point which defines the offset of the reference hatch line from the origin of the (virtual) hatching coordinate system. The origin is used for mapping the fill area style hatching onto an annotation fill area or surface. The reference hatch line would then appear with this offset from the fill style target point. If not given the reference hatch lines goes through the origin of the (virtual) hatching coordinate system.",
|
|
"StartOfNextHatchLine": "A repetition factor that determines the distance between adjacent hatch lines."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: The fill area style hatching defines a styled pattern of curves for hatching an annotation fill area or a surface. Definition from IAI: The IfcFillAreaStyleHatching is used to define simple, vector-based hatching patterns, based on styled straight lines. The curve font, color and thickness is given by the HatchLineAppearance, the angle by the HatchLineAngle and the distance to the next hatch line by StartOfNextHatchLine, being either an offset distance or a vector. For better control of the hatching appearance, when using hatch lines with other fonts then continuous, the PatternStart allows to offset the start of the curve font pattern along the reference hatch line (if not given, the PatternStart is at zero distance from the virtual point of origin). If the reference hatch line does not go through the origin (of the virtual hatching coordinate system), it can be offset by using the PatternStart ~~PointOfReferenceHatchLine.~~ Illustration",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcfillareastylehatching.htm"
|
|
},
|
|
"IfcFillAreaStyleTileSymbolWithStyle": {
|
|
"attributes": {
|
|
"Symbol": "A styled annotation symbol."
|
|
},
|
|
"description": "The fill area style tile symbol with style is a symbol that is used as a tile within an annotated tiling.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcfillareastyletilesymbolwithstyle.htm"
|
|
},
|
|
"IfcFillAreaStyleTiles": {
|
|
"attributes": {
|
|
"Tiles": "A set of constituents of the tile.",
|
|
"TilingPattern": "A two direction repeat factor defining the shape and relative positioning of the tiles.",
|
|
"TilingScale": "The scale factor applied to each tile as it is placed in the annotation fill area."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: The fill area style tiles defines a two dimensional tile to be used for the filling of annotation fill areas or other closed regions. The content of a tile is defined by the tile set, and the placement of each tile determined by the filling pattern which indicates how to place tiles next to each other. Tiles or parts of tiles outside of the annotation fill area or closed region shall be clipped at the boundaries of the area or region.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcfillareastyletiles.htm"
|
|
},
|
|
"IfcFilterType": {
|
|
"description": "The element type IfcFilterType defines a list of commonly shared property set definitions of a filter and an optional set of product representations. It is used to define a filter specification (i.e. the specific product information, that is common to all occurrences of that product type). A filter type is used to define the common properties of a filter that may be applied to many occurrences of that type. A filter is an apparatus used to remove particulate or gaseous matter from fluids and gases. Filter types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcFilterType are represented by instances of IfcTreatmentDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_FilterTypeCommon: common property set for all filter types Pset_FilterTypeAirParticleFilter: property set for all air particle filter types",
|
|
"predefined_types": {
|
|
"AIRPARTICLEFILTER": "A filter used to remove particulates from air.",
|
|
"NOTDEFINED": "Undefined filter type.",
|
|
"ODORFILTER": "A filter used to remove odors from air.",
|
|
"OILFILTER": "A filter used to remove particulates from oil.",
|
|
"STRAINER": "A filter used to remove particulates from a fluid.",
|
|
"USERDEFINED": "User-defined filter type.",
|
|
"WATERFILTER": "A filter used to remove particulates from water."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcfiltertype.htm"
|
|
},
|
|
"IfcFireSuppressionTerminalType": {
|
|
"description": "The IfcFireSuppressionTerminalType defines a particular type of IfcFlowTerminal that has the purpose of delivering a fluid (gas or liquid) that will suppress a fire. *Use Definitions* An IfcFireSuppressionTerminalType provides for all forms of sprinkler, spreader and other form of terminal that is connected to a pipework system and intended to act in the role of suppressing a fire . An IfcFireSuppressionTerminalType may be included into the spatial context of the building model through an (or multiple) instances of IfcFlowTerminal. The parameters of the fire suppression terminal type are defined through the type driven property sets referred to by the predefined type attribute of IfcFireSuppressionTerminalType. *Property Set Use Definition*: The property sets relating to the IfcFireSuppressionTerminalType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcFireSuppressionTerminalType are part of this IFC release: - Pset_FireSuppressionTerminalTypeBreechingInlet: specific property set for the properties of a breeching inlet, if available - Pset_FireSuppressionTerminalTypeFireHydrant: specific property set for the properties of a fire hydrant, if available - Pset_FireSuppressionTerminalTypeSprinkler: specific property set for the properties of a sprinkler, if available - Pset_FireSuppressionTerminalTypeHoseReel: specific property set for the properties of a hose reel, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"BREECHINGINLET": "Symmetrical pipe fitting that unites two or more inlets into a single pipe. A breeching inlet may be used on either a wet or dry riser. Used by fire services personnel for fast connection of fire appliance hose reels. May also be used for foam.",
|
|
"FIREHYDRANT": "Device, fitted to a pipe, through which a temporary supply of water may be provided. May also be termed a stand pipe.",
|
|
"HOSEREEL": "A supporting framework on which a hose may be wound.",
|
|
"NOTDEFINED": "Underined type.",
|
|
"SPRINKLER": "Device for sprinkling water from a pipe under pressure over an area.",
|
|
"SPRINKLERDEFLECTOR": "Device attached to a sprinkler to deflect the water flow into a spread pattern to cover the required area.",
|
|
"USERDEFINED": "User-defined type"
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcplumbingfireprotectiondomain/lexical/ifcfiresuppressionterminaltype.htm"
|
|
},
|
|
"IfcFlowController": {
|
|
"description": "The distribution flow element IfcFlowController defines the occurrence of elements of a distribution system that are used to regulate flow through a distribution system (e.g., damper, valve, switch, relay, etc.). Its type is defined by IfcFlowControllerType or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DistributionFlowElementCommon: common property set for distribution flow element occurrences - Pset_FlowControllerDamper: property set for damper flow controller occurrences - Pset_FlowControllerFlowMeter: property set for flowmeter flow controller occurrences Geometry Use Definitions The geometric representation of IfcFlowController is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcDistributionFlowElement. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcDistributionFlowElement.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowcontroller.htm"
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},
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"IfcFlowControllerType": {
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"description": "The element type IfcFlowControllerType defines a list of commonly shared property set definitions of a flow controller and an optional set of product representations. It is used to define a flow controller specification (i.e. the specific product information, that is common to all occurrences of that product type). A flow controller type is used to define the common properties of a flow controller that may be applied to many occurrences of that type. A flow controller is a device that regulates flow within a distribution system, such as a valve in a piping system, modulating damper in an air distribution system, or electrical switch in an electrical distribution system. Flow controller types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcFlowControllerType are represented by instances of IfcFlowController or its subtypes.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowcontrollertype.htm"
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},
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"IfcFlowFitting": {
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"description": "The distribution flow element IfcFlowFitting defines the occurrence of a junction or transition in a flow distribution system (e.g., elbow, tee, etc.). Its type is defined by IfcFlowFittingType or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DistributionFlowElementCommon: common property set for distribution flow element occurrences - Pset_FlowFittingDuctFitting: property set for duct fitting occurrences - Pset_FlowFittingPipeFitting: property set for pipe fitting occurrences Geometry Use Definitions The geometric representation of IfcFlowFitting is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcDistributionFlowElement. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcDistributionFlowElement.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowfitting.htm"
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},
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"IfcFlowFittingType": {
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"description": "The element type IfcFlowFittingType defines a list of commonly shared property set definitions of a flow fitting and an optional set of product representations. It is used to define a flow fitting specification (i.e. the specific product information, that is common to all occurrences of that product type). A flow fitting type is used to define the common properties of a flow fitting that may be applied to many occurrences of that type. A flow fitting is a device that is used to interconnect flow segments or other fittings within a distribution system, such as a tee in a ducted system that branches flow into two directions, a junction box in an electrical distribution system, etc. Flow fitting types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcFlowFittingType are represented by instances of IfcFlowFitting or its subtypes.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowfittingtype.htm"
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},
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"IfcFlowInstrumentType": {
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"description": "An IfcFlowInstrumentType defines a particular type of flow instrument that reads and displays the value of a particular property of a system at a point, or that displays the difference in the value of a property between two points. *Use Definitions* An IfcFlowInstrumentType provides for all forms of mechanical flow instrument (thermometers, pressure gauges etc.) and electrical flow instruments (ammeters, voltmeters etc.) Usage of IfcFlowInstrumentType defines the parameters for one or more occurrences of IfcDistributionControlElement. Parameters for mechanical flow instruments are specified through property sets that are enumerated in the IfcFlowInstrumentTypeEnum data type. Property sets for electrical flow instruments are not yet defined. *Property Set Use Definition*: The property sets relating to the IfcFlowInstrumentType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcFlowInstrumentType are part of this IFC release: - Pset_FlowInstrumentTypeThermometer: specific property set for the properties of a thermometer, if available - Pset_FlowInstrumentTypePressureGauge: specific property set for the properties of a pressure gauge, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
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"predefined_types": {
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"AMMETER": "A device that reads and displays the current flow in a circuit.",
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"FREQUENCYMETER": "A device that reads and displays the electrical frequency of an alternating current circuit.",
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"NOTDEFINED": "Undefined type.",
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"PHASEANGLEMETER": "A device that reads and displays the phase angle of a phase in a polyphase electrical circuit.",
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"POWERFACTORMETER": "A device that reads and displays the power factor of an electrical circuit.",
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"PRESSUREGAUGE": "A device that reads and displays a pressure value at a point or the pressure difference between two points.",
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"THERMOMETER": "A device that reads and displays a temperature value at a point.",
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"USERDEFINED": "User-defined type.",
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"VOLTMETER_PEAK": "A device that reads and displays the peak voltage in an electrical circuit.",
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"VOLTMETER_RMS": "A device that reads and displays the RMS (mean) voltage in an electrical circuit."
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},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcbuildingcontrolsdomain/lexical/ifcflowinstrumenttype.htm"
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},
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"IfcFlowMeterType": {
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"description": "The element type IfcFlowMeterType defines a list of commonly shared property set definitions of a flow meter and an optional set of product representations. It is used to define a flow meter specification (i.e. the specific product information, that is common to all occurrences of that product type). A flow meter type is used to define the common properties of a flow meter that may be applied to many occurrences of that type. A flow meter is a device that is used to measure the flow rate in a system. flow meter types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcFlowMeterType are represented by instances of IfcFlowController or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_FlowMeterTypeCommon: common property set for all flow meter types Pset_FlowMeterTypeEnergyMeter: property set for all flow meter types that are used to measure the flow of energy Pset_FlowMeterTypeGasMeter: property set for all flow meter types that are used to measure the flow of gas Pset_FlowMeterTypeOilMeter: property set for all flow meter types that are used to measure the flow of oil Pset_FlowMeterTypeWaterMeter: property set for all flow meter types that are used to measure the flow of water",
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"predefined_types": {
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"ELECTRICMETER": "",
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"ENERGYMETER": "An electric meter or energy meter is a device that measures the amount of electrical energy supplied to or produced by a residence, business or machine.",
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"FLOWMETER": "",
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"GASMETER": "A device that measures the quantity of a gas or fuel.",
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"NOTDEFINED": "Undefined meter type",
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"OILMETER": "A device that measures the quantity of oil.",
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"USERDEFINED": "User-defined meter type",
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"WATERMETER": "A device that measures the quantity of water."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcflowmetertype.htm"
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},
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"IfcFlowMovingDevice": {
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"description": "The distribution flow element IfcFlowMovingDevice defines the occurrence of an apparatus used to distribute, circulate or perform conveyance of fluids, including liquids and gases, and typically participates in a flow distribution system (e.g., pump, fan). Its type is defined by IfcFlowMovingDeviceType or its subtypes. IfcFlowMovingDevice is a container entity that aggregates all components of the device it represents. The aggregation is handled via the IfcRelAggregates relationship. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DistributionFlowElementCommon: common property set for distribution flow element occurrences - Pset_FlowMovingDeviceCompressor: property set for compressor occurrences - Pset_FlowMovingDeviceFan: property set for fan occurrences - Pset_FlowMovingDeviceFanCentrifugal: property set for centrifugal fan occurrences - Pset_FlowMovingDevicePump: property set for pump occurrences Geometry Use Definitions The geometric representation of IfcFlowMovingDevice is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcDistributionFlowElement. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcDistributionFlowElement.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowmovingdevice.htm"
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},
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"IfcFlowMovingDeviceType": {
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"description": "The element type IfcFlowMovingDeviceType defines a list of commonly shared property set definitions of a flow moving device and an optional set of product representations. It is used to define a flow moving device specification (i.e. the specific product information, that is common to all occurrences of that product type). A flow moving type is used to define the common properties of a flow moving device that may be applied to many occurrences of that type. A flow moving device is a device that is used to produce a pressure differential in a distribution system, such as a pump, fan, compressor, etc. Flow moving types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcFlowMovingDeviceType are represented by instances of IfcFlowMoving or its subtypes.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowmovingdevicetype.htm"
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},
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"IfcFlowSegment": {
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"description": "The distribution flow element IfcFlowSegment defines the occurrence of a segment of a flow distribution system that is typically straight, contiguous and has two ports (e.g., a section of pipe or duct). The IfcFlowSegment defines a particular occurrence of a segment inserted in the spatial context of a project. The parameters defining the type of the segment and/or its shape are defined by the IfcFlowSegmentType, which is related by the inverse relationship IsDefinedBy pointing to IfcRelDefinesByType. The following parameters shall be given: - Segment length, taken from the Length attribute in the property set, provides the depth of the extrusion. - Segment profile dimensions are defined by the NominalDiameterOrWidth and NominalHeight attributes in the property set. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DistributionFlowElementCommon: common property set for distribution flow element occurrences - Pset_FlowSegmentDuctSegment: property set for duct segment occurrences - Pset_FlowSegmentPipeSegment: property set for pipe segment occurrences Geometry Use Definitions The geometric representation of IfcFlowSegment is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcDistributionFlowElement. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcDistributionFlowElement.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowsegment.htm"
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},
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"IfcFlowSegmentType": {
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"description": "The element type IfcFlowSegmentType defines a list of commonly shared property set definitions of a flow segment and an optional set of product representations. It is used to define a flow segment specification (i.e. the specific product information, that is common to all occurrences of that product type). A flow segment type is used to define the common properties of a flow segment that may be applied to many occurrences of that type. A flow segment is a section of a distribution system, such as a duct, pipe, conduit, etc. that typically has only two ports. Flow segment types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcFlowSegmentType are represented by instances of IfcFlowSegment or its subtypes.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowsegmenttype.htm"
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},
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"IfcFlowStorageDevice": {
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"description": "The distribution flow element IfcFlowStorageDevice defines the occurrence of a device that participates in a distribution system and is used for temporary storage of a fluid such as a liquid or a gas (e.g., tank). Its type is defined by IfcFlowStorageDeviceType or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DistributionFlowElementCommon: common property set for distribution flow element occurrences - Pset_FlowStorageDeviceTank: property set for tank storage device occurrences Geometry Use Definitions The geometric representation of IfcFlowStorageDevice is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcDistributionFlowElement. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcDistributionFlowElement.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowstoragedevice.htm"
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},
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"IfcFlowStorageDeviceType": {
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"description": "The element type IfcFlowStorageDeviceType defines a list of commonly shared property set definitions of a flow storage device and an optional set of product representations. It is used to define a flow storage device specification (i.e. the specific product information, that is common to all occurrences of that product type). A flow storage type is used to define the common properties of a flow storage device that may be applied to many occurrences of that type. A flow storage device is a device used for the temporary storage of a fluid such as a liquid or a gas (e.g., tank), the voltage potential induced by the induced electron flow (e.g., a battery), etc. Flow storage types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcFlowStorageDeviceType are represented by instances of IfcFlowStorage or its subtypes.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowstoragedevicetype.htm"
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},
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"IfcFlowTerminal": {
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"description": "The distribution flow element IfcFlowTerminal defines the occurrence of a permanently attached element that acts as a terminus or beginning of a distribution system (e.g., air outlet, drain, water closet, sink, etc.). A terminal is typically a point at which a system interfaces with an external environment. Its type is defined by IfcFlowTerminalType or its subtypes. An IfcFlowController can be either aggregated into the definition of the IfcFlowTerminal using the IfcRelAggregates relationship, or referenced using the IfcRelConnectsPorts objectified relationship. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DistributionFlowElementCommon: common property set for distribution flow element occurrences - Pset_FlowTerminalAirTerminal: property set for air terminal occurrences Geometry Use Definitions The geometric representation of IfcFlowTerminal is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcDistributionFlowElement. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_FlowTerminalAirTerminal: Occurrence-specific property set for individual air terminal occurrences. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcDistributionFlowElement.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowterminal.htm"
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},
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"IfcFlowTerminalType": {
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"description": "The element type IfcFlowTerminalType defines a list of commonly shared property set definitions of a flow terminal and an optional set of product representations. It is used to define a flow terminal specification (i.e. the specific product information, that is common to all occurrences of that product type). A flow terminal type is used to define the common properties of a flow terminal that may be applied to many occurrences of that type. A flow terminal acts as a terminus or beginning element in a distribution system such as a ceiling register in a ducted air distribution system, a sink in a waste-water system, or a light fixture in an electrical lighting system. Flow terminal types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcFlowTerminalType are represented by instances of IfcFlowTerminal or its subtypes.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowterminaltype.htm"
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},
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"IfcFlowTreatmentDevice": {
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"description": "The distribution flow element IfcFlowTreatmentDevice defines the occurrence of a device typically used to remove unwanted matter from a fluid, either liquid or gas, and typically participates in a flow distribution system (e.g., air filter). Its type is defined by IfcFlowTreatmentDeviceType or its subtypes. IfcFlowTreatmentDevice is a container entity that aggregates all components of the device it represents. The aggregation is handled via the IfcRelAggregates relationship. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_DistributionFlowElementCommon: common property set for distribution flow element occurrences Geometry Use Definitions The geometric representation of IfcFlowTreatmentDevice is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcDistributionFlowElement. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcDistributionFlowElement.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowtreatmentdevice.htm"
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},
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"IfcFlowTreatmentDeviceType": {
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"description": "The element type IfcFlowTreatmentDeviceType defines a list of commonly shared property set definitions of a flow treatment device and an optional set of product representations. It is used to define a flow treatment device specification (i.e. the specific product information, that is common to all occurrences of that product type). A flow treatment type is used to define the common properties of a flow treatment device that may be applied to many occurrences of that type. A flow treatment device is a device used to change the physical properties of the medium, such as an air, oil or water filter (used to remove particulates from the fluid), duct silencer (used to attenuate noise), etc. flow treatment types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcFlowTreatmentDeviceType are represented by instances of IfcFlowTreatmentDevice or its subtypes.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowtreatmentdevicetype.htm"
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},
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"IfcFluidFlowProperties": {
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"attributes": {
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"FlowConditionSingleValue": "Defines the flow condition as a percentage of the cross-sectional area.",
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"FlowConditionTimeSeries": "A times series defining the flow condition as a percentage of the cross-sectional area.",
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"FlowrateSingleValue": "The flow rate of the fluid. Either a mass or volumetric flow rate shall be defined.",
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"FlowrateTimeSeries": "A time series of flow rate values. Note that either volumetric or mass flow rate values should be specified.",
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"Fluid": "The properties of the fluid.",
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"PressureSingleValue": "The pressure of the fluid.",
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"PressureTimeSeries": "A time series of pressure values of the fluid.",
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"PropertySource": "The source of the fluid flow properties (e.g., are these design values, measured values, etc.).",
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"TemperatureSingleValue": "Temperature of the fluid. For air this value represents the dry bulb temperature.",
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"TemperatureTimeSeries": "Time series of fluid temperature values. For air, these values represent the dry bulb temperature.",
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"UserDefinedPropertySource": "This attribute must be defined if the PropertySource is USERDEFINED.",
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"VelocitySingleValue": "The velocity of the fluid.",
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|
"VelocityTimeSeries": "A time series of velocity values of the fluid.",
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"WetBulbTemperatureSingleValue": "Wet bulb temperature of the fluid; only applicable if the fluid is air.",
|
|
"WetBulbTemperatureTimeSeries": "Time series of fluid wet bulb temperature values. These values are only applicable if the fluid is air."
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|
},
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|
"description": "Common definition to capture the basic flow properties of a fluid typically used within a flow distribution system. In cases where an attribute has a SingleValue specified, the corresponding TimeSeries value shall be omitted. Contrarily, when a TimeSeries value is specified, the corresponding SingleValue shall be omitted. IfcFluidFlowProperties is a statically defined property set and should be attached to the instance(s) of the IfcDistributionPort through the IfcRelDefinesByProperties relationship. Where two ports are joined together via the IfcRelConnectsPorts relationship, instances of the IfcFluidFlowProperties can be shared.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcfluidflowproperties.htm"
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},
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"IfcFooting": {
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"description": "A part of the foundation of a structure that spreads and transmits the load directly to the soil. *Property Set Use Definition*: The property sets relating to the IfcFooting are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcFooting are part of this IFC release: - Pset_ReinforcementBarCountOfIndependentFooting: property set for independent IfcFooting occurrences. - Pset_ReinforcementBarPitchOfContinuousFooting: property set for continuous IfcFooting occurrences. Geometry Use Definitions: The geometric representation of IfcFooting is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The local placement for IfcFooting is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Standard Geometric Representation Provided that it is possible the standard geometric representation of IfcFooting is defined using the swept solid representation. The RepresentationType attribute of IfcShapeRepresentation should have the value 'SweptSolid'. The following constraints apply to the standard representation: - Solid: IfcExtrudedAreaSolid shall be supported - Profile: All applicable profile types shall be supported - Extrusion: All extrusion directions shall be supported. If it is impossible to define the geometry using the swept solid representation the representations defined in its supertype IfcBuildingElement may be used.",
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"predefined_types": {
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"FOOTING_BEAM": "Footing elements that are in bending and are supported clear of the ground. They will normally span between piers, piles or pile caps. They are distinguished from beams in the building superstructure since they will normally require a lower grade of finish. They are distinguished from _STRIP_FOOTING_ since they are clear of the ground surface and hence require support to the lower face while the concrete is curing.",
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"NOTDEFINED": "The type of footing is not defined.",
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"PAD_FOOTING": "An element that transfers the load of a single column (possibly two) to the ground.",
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|
"PILE_CAP": "An element that transfers the load from a column or group of columns to a pier or pile or group of piers or piles.",
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|
"STRIP_FOOTING": "A linear element that transfers loads into the ground from either a continuous element, such as a wall, or from a series of elements, such as columns.",
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|
"USERDEFINED": "Special types of footings which meet specific local requirements."
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|
},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifcfooting.htm"
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|
},
|
|
"IfcFuelProperties": {
|
|
"attributes": {
|
|
"CarbonContent": "The carbon content in the fuel. This is measured in weight of carbon per unit weight of fuel and is therefore unitless.",
|
|
"CombustionTemperature": "Combustion temperature of the material when air is at 298 K and 100 kPa.",
|
|
"HigherHeatingValue": "Higher Heating Value is defined as the amount of energy released (MJ/kg) when a fuel is burned completely, and H2O is in liquid form in the combustion products.",
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|
"LowerHeatingValue": "Lower Heating Value is defined as the amount of energy released (MJ/kg) when a fuel is burned completely, and H2O is in vapor form in the combustion products."
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|
},
|
|
"description": "Common definition to capture the properties of fuel energy typically used within the context of building services and flow distribution systems.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcfuelproperties.htm"
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},
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"IfcFurnishingElement": {
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"description": "Generalization of all furniture related objects. Furnishing objects are characterized as being - pre-manufactured and assembled on-site, or - manufactured on-site (built-in) Thus furnishing elements can either be movable, or not (as the built-ins). *Geometry Use Definitions*: The geometric representation of IfcFurnishingElement is given by the IfcProductDefinitionShape and IfcLocalPlacement allowing multiple geometric representation. Local Placement The local placement for IfcFurnishingElement is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement , which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Geometric Representations Any IfcFurnishingElement can be represented by one or several geometric representations. This includes the general representation types 'BoundingBox', 'GeometricCurveSet', 'SurfaceModel', 'Brep', and 'MappedRepresentation' being defined here. Bounding Box Representation Any IfcFurnishingElement may be represented as a bounding box, which shows the maximum extend of the body within the coordinated system established by the IfcLocalPlacement. The bounding box representation is the simplest geometric representation available. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Box' - RepresentationType : 'BoundingBox' Foot Print Representation The foot print representation of IfcFurnishingElement is given by either a single or multiple 2D points and curves. The representation identifier and type of this geometric representation are: - IfcShapeRepresentation.RepresentationIdentifier = 'FootPrint' - IfcShapeRepresentation.RepresentationType = 'GeometricCurveSet' SurfaceModel Representation Any IfcFurnishingElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple surface models, based on either shell or face based models. In some cases it may be useful to also expose a simple representation as a bounding box representation of the same complex shape. The representation identifier and type of this geometric representation are: - IfcShapeRepresentation.RepresentationIdentifier = 'Body' - IfcShapeRepresentation.RepresentationType = 'SurfaceModel' Brep Representation Any IfcFurnishingElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple Boundary Representation elements (which are restricted to faceted Brep with or without voids). The Brep representation allows for the representation of complex element shape. In some cases it may be useful to also expose a simple representation as a bounding box representation of the same complex shape. The representation identifier and type of this geometric representation are: - IfcShapeRepresentation.RepresentationIdentifier = 'Body' - IfcShapeRepresentation.RepresentationType = 'Brep' MappedRepresentation The IfcMappedItem should always be used in appropriate cases as it allows for reusing the geometry definition of the furnishing type for all occurrences of the same type. The representation identifier and type of this geometric representation are: - IfcShapeRepresentation.RepresentationIdentifier = 'FootPrint', or 'Body' (depending of the representation map) - IfcShapeRepresentation.RepresentationType = 'MappedRepresentation'",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcfurnishingelement.htm"
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},
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"IfcFurnishingElementType": {
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"description": "The IfcFurnishingElementType defines a list of commonly shared property set definitions of an element and an optional set of product representations. It is used to define an element specification (i.e. the specific product information, that is common to all occurrences of that product type). A furnishing element type is used to define the common properties of a certain type of a furnishing element that may be applied to many instances of that feature type to assign a specific style. Furnishing element types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcFurnishingElementType are represented by instances of IfcFurnishingElement (or its subtypes).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcfurnishingelementtype.htm"
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},
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"IfcFurnitureStandard": {
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"description": "An IfcFurnitureStandard is a standard for furniture allocation that can be assigned to persons within an organization. A furniture standard is assigned a set of classification notations (through the IfcRelAssociatesClassification class within the IfcKernel schema) that determine the types of furniture that fulfill the requirements of the standard. In order to use the IfcFurnitureStandard class, a classification of furniture items must have been established. This does not mean that each individual furniture item needs to have a classification notation although this is considered to be desirable. A furniture standard is assigned to one or several persons or organizations (like a work group or department) through the IfcRelAssignsToControl relationship via the Controls inverse attribute.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcfurniturestandard.htm"
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},
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"IfcFurnitureType": {
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"attributes": {
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"AssemblyPlace": "A designation of where the assembly is intended to take place defined by an Enum."
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},
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"description": "An IfcFurnitureType defines a particular type of item of furniture such as a table, desk, chair, filing cabinet etc. Use Definitions An IfcFurnitureType provides for all forms of unit furniture. Refer to description for IfcSystemFurnitureElementType for descriptions of system elements that may be provided as part of a kit or 'flatpack' for local assembly. Occurrences of a type of furniture are specified through IfcFurnishingElement. *Property Set Use Definition*: The property sets relating to an IfcFurnitureType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcFurnitureType are part of this IFC release: - Pset_FurnitureTypeCommon: property set for the properties common to all types of furniture, if available - Pset_FurnitureTypeChair: specific property set for the properties of a chair, if available - Pset_FurnitureTypeDesk: specific property set for the properties of a desk, if available - Pset_FurnitureTypeFileCabinet: specific property set for the properties of a filing cabinet, if available - Pset_FurnitureTypeTable: specific property set for the properties of a table, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem. *Name Use Definitions* The name of the type of furniture is defined through the IfcFurnitureType.Name attribute (through inheritance from IfcRoot). The following items are examples of names that may be given to instances of IfcFurnitureType. It is concerned only with internal furniture. The list is drawn from the Uniclass classification system published by RIBA Enterprises Ltd and is reproduced by permission. A similar list could also be defined for external furniture. Note that the list does not contain any items that have an electrical or other services connection. Generally, these are dealt with under a relevant building services entity e.g. IfcElectricalApplianceType.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedfacilitieselements/lexical/ifcfurnituretype.htm"
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},
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"IfcGasTerminalType": {
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"description": "The element type IfcGasTerminalType defines a list of commonly shared property set definitions of a gas terminal and an optional set of product representations. It is used to define a gas terminal specification (i.e. the specific product information, that is common to all occurrences of that product type). A gas terminal type is used to define the common properties of a gas terminal that may be applied to many occurrences of that type. A gas terminal is a device where gas is consumed or combusted, such as in a gas-fired hot water or steam boiler. Gas terminal types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcGasTerminalType are represented by instances of IfcFlowTerminal or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_GasTerminalTypeCommon: common property set for all gas terminal types Pset_GasTerminalTypeGasAppliance: property set for all gas appliance terminal types Pset_GasTerminalTypeGasBurner: property set for all gas burner terminal types",
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"predefined_types": {
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"GASAPPLIANCE": "",
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"GASBOOSTER": "",
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"GASBURNER": "",
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"NOTDEFINED": "",
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"USERDEFINED": ""
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcgasterminaltype.htm"
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},
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"IfcGeneralMaterialProperties": {
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"attributes": {
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"MassDensity": "Material mass density, usually measured in [kg/m3].",
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"MolecularWeight": "Molecular weight of material (typically gas), measured in g/mole.",
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"Porosity": "The void fraction of the total volume occupied by material (Vbr - Vnet)/Vbr [m3/m3]."
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},
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"description": "A container class with general material properties defined in IFC specification.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcgeneralmaterialproperties.htm"
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},
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"IfcGeneralProfileProperties": {
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"attributes": {
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"CrossSectionArea": "Cross sectional area of profile. Usually measured in [mm2].",
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"MaximumPlateThickness": "This value is needed for stress analysis and to handle buckling problems. It can also be derived from the given profile geometry and therefore it is only an optional feature allowing for an explicit description. Usually measured in [mm].",
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"MinimumPlateThickness": "This value is needed for stress analysis and to handle buckling problems. It can also be derived from the given profile geometry and therefore it is only an optional feature allowing for an explicit description. Usually measured in [mm].",
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"Perimeter": "Perimeter of the profile for calculating the surface area. Usually measured in [mm].",
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"PhysicalWeight": "Weight of an imaginary steel beam per length, as for example given by the national standards\t for this profile. Usually measured in [kg/m]."
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},
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"description": "This is a collection of properties applicable to all linear structural members having a profile definition.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofilepropertyresource/lexical/ifcgeneralprofileproperties.htm"
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},
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"IfcGeometricCurveSet": {
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"description": "Definition from ISO/CD 10303-42:1992: A geometric curve set is a collection of two or three dimensional points and curves. The IfcGeometricCurveSet is used for the exchange of shape representations consisting of (2D or 3D) points and curves only.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcgeometriccurveset.htm"
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},
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"IfcGeometricRepresentationContext": {
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"attributes": {
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"CoordinateSpaceDimension": "The integer dimension count of the coordinate space modeled in a geometric representation context.",
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"HasSubContexts": "The set of _IfcGeometricRepresentationSubContexts_ that refer to this _IfcGeometricRepresentationContext_.",
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"Precision": "Value of the model precision for geometric models. It is a double value (REAL), typically in 1E-5 to 1E-8 range, that indicates the tolerance under which two given points are still assumed to be identical. The value can be used e.g. to sets the maximum distance from an edge curve to the underlying face surface in brep models.",
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"TrueNorth": "Direction of the true north relative to the underlying coordinate system as established by the attribute _WorldCoordinateSystem_. It is given by a direction within the xy-plane of the underlying coordinate system. If not given, it defaults to the positive direction of the y-axis of the _WorldCoordinateSystem_.",
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"WorldCoordinateSystem": "Establishment of the engineering coordinate system (often referred to as the world coordinate system in CAD) for all representation contexts used by the project. > Note it can be used to provide better numeric stability if the placement of the building(s) is far away from the origin. In most cases however it would be set to origin: (0.,0.,0.) and directions x(1.,0.,0.), y(0.,1.,0.), z(0.,0.,1.)."
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},
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"description": "Definition from ISO/CD 10303-42:1992: A geometric representation context is a representation context in which the geometric representation items are geometrically founded. A geometric representation context is a distinct coordinate space, spatially unrelated to other coordinate spaces. Definition from IAI: The IfcGeometricRepresentationContext defines the context that applies to several shape representations of products within a project. It defines the type of the context in which the shape representation is defined, and the numeric precision applicable to the geometric representation items defined in this context. In addition it can be used to offset the project coordinate system from a global point of origin, using the WorldCoordinateSystem attribute. The TrueNorth attribute can be given, if the y axis of the WorldCoordinateSystem does not point to the global northing. The use of one instance of IfcGeometricRepresentationContext to represent the model (3D) view is mandatory, the use of a second instance of IfcGeometricRepresentationContext to represent the plan (2D) view is optional (but needs to be given, if there are scale dependent plan views), the additional scale or view dependent contexts need to be handled by using the subtype IfcGeometricRepresentationSubContext pointing to the model view (or the plan view) as the ParentContext.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcgeometricrepresentationcontext.htm"
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},
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"IfcGeometricRepresentationItem": {
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"description": "Definition from ISO/CD 10303-43:1992: An geometric representation item is a representation item that has the additional meaning of having geometric position or orientation or both. This meaning is present by virtue of: - being a Cartesian point or a direction - referencing directly a Cartesian point or direction - referencing indirectly a Cartesian point or direction An indirect reference to a Cartesian point or direction means that a given geometric item references the Cartesian point or direction through one or more intervening geometry or topology items. The derivation of the dimensionality of the IfcGeometricRepresentationItem is different to STEP, there is a specific derived attribute at each class that defines the dimensionality, whereas STEP does it for the representation_context and requires all geometric_representation_item's to have the same dimensionality therein. The definition of swept area solids as geometric representation items is different to STEP, it is based on a set of predefined profiles (or cross sections), i.e. a set of parameterized geometric primitives widely supported in the industry. Those profiles are used to create volumes through extrusion, revolution and cross section based sweep operations. This method was called attribute driven geometric representation and it was formerly known as implicit geometry in IFC.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcgeometricrepresentationitem.htm"
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},
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"IfcGeometricRepresentationSubContext": {
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"attributes": {
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"CoordinateSpaceDimension": "ParentContext.CoordinateSpaceDimension",
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"ParentContext": "Parent context from which the sub context derives its world coordinate system, precision, space coordinate dimension and true north.",
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"Precision": "NVL(ParentContext.Precision,1.E-5)",
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"TargetScale": "The target plot scale of the representation to which this representation context applies. > Scale indicates the target plot scale for the representation sub context, all annotation styles are given in plot dimensions according to this target plot scale. If multiple instances of IfcGeometricRepresentationSubContext are given having the same TargetView value, the target plot scale applies up to the next smaller scale, or up to unlimited small scale. Note: Scale 1:100 (given as 0.01 within TargetScale) is bigger then 1:200 (given as 0.005 within TargetScale).",
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"TargetView": "Target view of the representation to which this representation context applies.",
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"TrueNorth": "NVL(ParentContext.TrueNorth,SELF.WorldCoordinateSystem.P[2])",
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"UserDefinedTargetView": "User defined target view, this attribute value shall be given, if the TargetView attribute is set to USERDEFINED.",
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"WorldCoordinateSystem": "ParentContext.WorldCoordinateSystem"
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},
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"description": "Definition from IAI: The IfcGeometricRepresentationSubContext defines the context that applies to several shape representations of a product being a sub context, sharing the WorldCoordinateSystem, CoordinateSpaceDimension, Precision and TrueNorth attributes with the parent IfcGeometricRepresentationContext. The IfcGeometricRepresentationSubContext is used to define semantically distinguished representation types for different information content, dependent on the representation view and the target scale. It can be used to control the level of detail of the shape representation that is most applicable to this geometric representation context. addition the sub context is used to control the later appearance of the _IfcShapeRepresentation_within a plot view. Each IfcProduct can then have several instances of subtypes of IfcRepresentation, each being assigned to a different geometric representation context (IfcGeometricRepresentationContext or IfcGeometricRepresentationSubContext). The application can then choose the most appropriate representation for showing the geometric shape of the product, depending on the target view and scale.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcgeometricrepresentationsubcontext.htm"
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},
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"IfcGeometricSet": {
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"attributes": {
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"Dim": "The space dimensionality of this class, it is identical to the first element in the set. A where rule ensures that all elements have the same dimensionality. Elements[1].Dim",
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"Elements": "The geometric elements which make up the geometric set, these may be points, curves or surfaces; but are required to be of the same coordinate space dimensionality."
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},
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"description": "Definition from ISO/CD 10303-42:1992: This entity is intended for the transfer of models when a topological structure is not available. The IfcGeometricSet is used for the exchange of shape representations consisting of (2D or 3D) points, curves, and/or surfaces, which do not have a topological structure (such as connected face sets or shells) and are not solid models (such as swept solids, CSG or Brep)",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcgeometricset.htm"
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},
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"IfcGrid": {
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"attributes": {
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"ContainedInStructure": "Relationship to a spatial structure element, to which the grid is primarily associated.",
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|
"UAxes": "List of grid axes defining the first row of grid lines.",
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|
"VAxes": "List of grid axes defining the second row of grid lines.",
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"WAxes": "List of grid axes defining the third row of grid lines. It may be given in the case of a triangular grid."
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|
},
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"description": "IfcGrid ia a planar design grid defined in 3D space used as an aid in locating structural and design elements. The position of the grid (ObjectPlacement) is defined by a 3D coordinate system (and thereby the design grid can be used in plan, section or in any position relative to the world coordinate system). The position can be relative to the object placement of other products or grids. The XY plane of the 3D coordinate system is used to place the grid axes, which are 2D curves (e.g., line, circle, trimmed curve, polyline, or composite curve). The inherited attributes Name and Description can be used to define a descriptive name of the grid and to indicate the grid's purpose. A grid is defined by (normally) two, or (in case of a triangular grid) three lists of grid axes. The following table shows some examples. The grid axes, defined within the design grid, are those elements to which project objects will be placed relatively using the IfcGridPlacement. Informal Proposition - Grid axes, which are referenced in different lists of axes (UAxes, VAxes, WAxes) shall not be parallel. - Grid axes should be defined such as there are no two grid axes which intersect twice. *Geometry Use Definitions* The geometric representation of IfcGrid is given by the IfcProductDefinitionShape, allowing geometric representations. Included are: Local Placement The local placement for IfcGrid is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Geometric Representations Currently, the use of a 2D 'FootPrint' representation of type 'GeometricCurveSet' is supported. GeometricCurveSet representation The 2D geometric representation of IfcGrid is defined using the 'GeometricCurveSet' geometry. The following attribute values should be inserted - IfcShapeRepresentation.RepresentationIdentifier = 'FootPrint'. - IfcShapeRepresentation.RepresentationType = 'GeometricCurveSet' . The following constraints apply to the 2D representation: - The IfcGeometricCurveSet shall be an (and the only) Item of the IfcShapeRepresentation. It should contain an IfcGeometricCurveSet containing subtypes of IfcCurve, each representing a grid axis. Applicable subtypes of IfcCurve are: IfcPolyline, IfcCircle, IfcTrimmedCurve (based on BaseCurve referencing IfcLine or IfcCircle). - Each subtype of IfcCurve may have a curve style assigned, using IfcAnnotationCurveOccurrence referencing IfcCurveStyle. - Optionally the grid axis labels may be added as IfcTextLiteral, and they may have text styles assigned, using IfcAnnotationTextOccurrence referencing IfcTextStyle. Illustrations",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcgrid.htm"
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},
|
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"IfcGridAxis": {
|
|
"attributes": {
|
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"AxisCurve": "Underlying curve which provides the geometry for this grid axis.",
|
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"AxisTag": "The tag or name for this grid axis.",
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"HasIntersections": "The reference to a set of",
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"PartOfU": "If provided, the _IfcGridAxis_ is part of the _UAxes_ of _IfcGrid_.",
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"PartOfV": "If provided, the _IfcGridAxis_ is part of the _VAxes_ of _IfcGrid_.",
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"PartOfW": "If provided, the _IfcGridAxis_ is part of the _WAxes_ of _IfcGrid_.",
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"SameSense": "Defines whether the original sense of curve is used or whether it is reversed in the context of the grid axis."
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},
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"description": "An individual axis, the IfcGridAxis, is defined in the context of a design grid. The axis definition is based on a curve of dimensionality 2. The grid axis is positioned within the XY plane of the position coordinate system defined by the IfcDesignGrid. *Geometry Use Definitions*: The standard geometric representation of IfcGridAxis is defined using a 2D curve entity. Grid axes are normally defined by an offset to another axis. The IfcOffsetCurve2D supports this concept. Each grid axis has a sense given by the parameterization of the curve. The attribute SameSense is an indicator of whether or not the sense of the grid axis agrees with, or opposes, that of the underlying curve. Illustration",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcgridaxis.htm"
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},
|
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"IfcGridPlacement": {
|
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"attributes": {
|
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"PlacementLocation": "A constraint on one or both ends of the path for an ExtrudedSolid.",
|
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"PlacementRefDirection": "Reference to a second grid axis intersection, which defines the orientation of the grid placement."
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},
|
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"description": "The IfcGridPlacement provides a specialization of IfcObjectPlacement in which the placement and axis direction of the object coordinate system is defined by a reference to the design grid as defined in IfcGrid. The location of the object coordinate system is given by the attribute PlacementLocation. The axis direction (of x-axis) of the object coordinate system is given: - by the tangent of the first grid axis (PlacementLocation.IntersectingAxes[1]) at the virtual intersection (maybe using the offset curve, if PlacementLocation.OffsetDistances is given) in case that the PlacementRefDirection is not given, - by the tangent between the virtual grid intersection of PlacementLocation and the virtual grid intersection of PlacementRefDirection in case that the PlacementRefDirection is given. The direction of the y-axis of the _IfcGridPlacement_is the orthogonal complement to the x-axis. The plane defined by the x and y axis shall be co-planar to the xy plane of the local placement of the IfcGrid. The direction of the z-axis is the orientation of the cross product of the x-axis and the y-axis, i.e. the z-axis of the IfcGridPlacement shall be co-linear to the z-axis of the local placement of the IfcGrid. *Geometry use definitions*: The following example shows the usage of placement location and direction for an IfcGridPlacement.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcgridplacement.htm"
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|
},
|
|
"IfcGroup": {
|
|
"attributes": {
|
|
"IsGroupedBy": "Contains the relationship that assigns the group members to the group object."
|
|
},
|
|
"description": "The IfcGroup is an generalization of any arbitrary group. A group is a logical collection of objects. It does not have its own position, nor can it hold its own shape representation. Therefore a group is an aggregation under some non-geometrical / topological grouping aspects. A group can hold any collection of objects (being products, processes, controls, resources, actors or other groups). Thus groups can be nested. An object can be part of zero, one, or many groups. Grouping relationships are not required to be hierarchical. The group collection is handled by an instance of IfcRelAssignsToGroup, which assigns all group members to the IfcGroup.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcgroup.htm"
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|
},
|
|
"IfcHalfSpaceSolid": {
|
|
"attributes": {
|
|
"AgreementFlag": "The agreement flag is TRUE if the normal to the BaseSurface points away from the material of the IfcHalfSpaceSolid. Otherwise it is FALSE.",
|
|
"BaseSurface": "Surface defining side of half space.",
|
|
"Dim": "The space dimensionality of this class, it is always 3 3"
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A half space solid is defined by the half space which is the regular subset of the domain which lies on one side of an unbounded surface. The side of the surface which is in the half space is determined by the surface normal and the agreement flag. If the agreement flag is TRUE, then the subset is the one the normal points away from. If the agreement flag is FALSE, then the subset is the one the normal points into. For a valid half space solid the surface shall divide the domain into exactly two subsets. Also, within the domain the surface shall be manifold and all surface normals shall point into the same subset. Informal propositions: - The base surface shall divide the domain into exactly two subsets. If the half space solid is of subtype boxed half space (IfcBoxedHalfSpace), the domain in question is that of the attribute enclosure. In all other cases the domain is all of space and the base surface shall be unbounded. - The base surface shall be an unbounded surface (subtype of IfcElementarySurface). Illustration:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifchalfspacesolid.htm"
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|
},
|
|
"IfcHeatExchangerType": {
|
|
"description": "The element type IfcHeatExchangerType defines a list of commonly shared property set definitions of a heat exchanger and an optional set of product representations. It is used to define a heat exchanger specification (i.e. the specific product information, that is common to all occurrences of that product type). A heat exchanger type is used to define the common properties of a heat exchanger that may be applied to many occurrences of that type. A heat exchanger is a device used to provide heat transfer between non-mixing media such as plate and shell and tube heat exchangers. The occurrences of the IfcHeatExchangerType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_HeatExchangerTypeCommon: common property set for all heat exchanger types Pset_HeatExchangerTypePlate: property set for all plate heat exchanger types",
|
|
"predefined_types": {
|
|
"NOTDEFINED": "Undefined heat exchanger type.",
|
|
"PLATE": "Plate heat exchanger.",
|
|
"SHELLANDTUBE": "Shell and Tube heat exchanger.",
|
|
"USERDEFINED": "User-defined heat exchanger type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcheatexchangertype.htm"
|
|
},
|
|
"IfcHumidifierType": {
|
|
"description": "The element type IfcHumidifierType defines a list of commonly shared property set definitions of a humidifier and an optional set of product representations. It is used to define a humidifier specification (i.e. the specific product information, that is common to all occurrences of that product type). A Humidifier type is used to define the common properties of a humidifier that may be applied to many occurrences of that type. A humidifier is a device that adds moisture into the air. Humidifier types may be exchanged without being already assigned to occurrences. The occurrences of the IfcHumidifierType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_HumidifierTypeCommon: common property set for all humidifier types",
|
|
"predefined_types": {
|
|
"ADIABATICAIRWASHER": "Water vapor is added into the airstream through adiabatic evaporation using an air washing element.",
|
|
"ADIABATICATOMIZING": "Water vapor is added into the airstream through adiabatic evaporation using an atomizing element.",
|
|
"ADIABATICCOMPRESSEDAIRNOZZLE": "Water vapor is added into the airstream through adiabatic evaporation using a compressed air nozzle.",
|
|
"ADIABATICPAN": "Water vapor is added into the airstream through adiabatic evaporation using a pan.",
|
|
"ADIABATICRIGIDMEDIA": "Water vapor is added into the airstream through adiabatic evaporation using a rigid media.",
|
|
"ADIABATICULTRASONIC": "Water vapor is added into the airstream through adiabatic evaporation using an ultrasonic element.",
|
|
"ADIABATICWETTEDELEMENT": "Water vapor is added into the airstream through adiabatic evaporation using a wetted element.",
|
|
"ASSISTEDBUTANE": "Water vapor is added into the airstream through water heated evaporation using a butane heater.",
|
|
"ASSISTEDELECTRIC": "Water vapor is added into the airstream through water heated evaporation using an electric heater.",
|
|
"ASSISTEDNATURALGAS": "Water vapor is added into the airstream through water heated evaporation using a natural gas heater.",
|
|
"ASSISTEDPROPANE": "Water vapor is added into the airstream through water heated evaporation using a propane heater.",
|
|
"ASSISTEDSTEAM": "Water vapor is added into the airstream through water heated evaporation using a steam heater.",
|
|
"NOTDEFINED": "Undefined humidifier type.",
|
|
"STEAMINJECTION": "Water vapor is added into the airstream through direct steam injection.",
|
|
"USERDEFINED": "User-defined humidifier type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifchumidifiertype.htm"
|
|
},
|
|
"IfcHygroscopicMaterialProperties": {
|
|
"attributes": {
|
|
"IsothermalMoistureCapacity": "Based on water vapor density, usually measured in [m3/ kg].",
|
|
"LowerVaporResistanceFactor": "The vapor permeability relationship of air/material (typically value > 1), measured in low relative humidity (typically in 0/50 % RH).",
|
|
"MoistureDiffusivity": "Usually measured in [m3/s].",
|
|
"UpperVaporResistanceFactor": "The vapor permeability relationship of air/material (typically value > 1), measured in high relative humidity (typically in 95/50 % RH).",
|
|
"VaporPermeability": "Usually measured in [kg/s m Pa]."
|
|
},
|
|
"description": "A container class with material hygroscopic properties defined in IFC specification.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifchygroscopicmaterialproperties.htm"
|
|
},
|
|
"IfcIShapeProfileDef": {
|
|
"attributes": {
|
|
"FilletRadius": "The fillet between the web and the flange, if not given, zero is assumed.",
|
|
"FlangeThickness": "Flange thickness of the I-shape. Both, the upper and the lower flanges have the same thickness and they are centred on the y-axis of the position coordinate system.",
|
|
"OverallDepth": "Total extent of the depth, defined parallel to the y axis of the position coordinate system.",
|
|
"OverallWidth": "Total extent of the width, defined parallel to the x axis of the position coordinate system.",
|
|
"WebThickness": "Thickness of the web of the I-shape. The web is centred on the x-axis and the y-axis of the position coordinate system."
|
|
},
|
|
"description": "Definition from IAI: The IfcIShapeProfileDef defines a section profile that provides the defining parameters of a symmetrical 'I' section to be used by the swept surface geometry or the swept area solid. The I-shape profile has values for its overall depth, width and its web and flange thickness. Additionally a fillet radius may be given. It represents a I-section that is symmetrical about its major and minor axes; and that has both top and bottom flanges being equal and centred on the web. Illustration: Table: Parameter of the I-shape profile definition",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcishapeprofiledef.htm"
|
|
},
|
|
"IfcImageTexture": {
|
|
"attributes": {
|
|
"UrlReference": ""
|
|
},
|
|
"description": "Definition from IAI: An IfcImageTexture provides a 2-dimensional distribution of the lighting parameters of a surface onto which it is mapped. The following additional definitions from ISO/IEC FCD 19775:200x, the Extensible 3D (X3D) specification, apply: - The ImageTexture node defines a texture map by specifying an image file and general parameters for mapping to geometry. Texture maps are defined in a 2D coordinate system (s, t) that ranges from [0.0, 1.0] in both directions. The bottom edge of the image corresponds to the S-axis of the texture map, and left edge of the image corresponds to the T-axis of the texture map. The lower-left pixel of the image corresponds to s=0, t=0, and the top-right pixel of the image corresponds to s=1, t=1. - The texture is read from the URL specified by the url [reference attribute]. When the url field contains no values ([]), texturing is disabled. Browsers shall support the JPEG and PNG image file formats. Support for the GIF format is also recommended (including transparency). The following general recommendations for image file format support from ISO/IEC FCD 19775:200x, the Extensible 3D (X3D) specification, also apply: Texture nodes that require support for the PNG image format shall interpret the PNG pixel formats in the following way: - Greyscale pixels without alpha or simple transparency are treated as intensity textures. - Greyscale pixels with alpha or simple transparency are treated as intensity plus alpha textures. - RGB pixels without alpha channel or simple transparency are treated as full RGB textures. - RGB pixels with alpha channel or simple transparency are treated as full RGB plus alpha textures. If the image specifies colours as indexed-colour (i.e., palettes or colourmaps), the following semantics should be used (note that `greyscale' refers to a palette entry with equal red, green, and blue values): - If all the colours in the palette are greyscale and there is no transparency chunk, it is treated as an intensity texture. - If all the colours in the palette are greyscale and there is a transparency chunk, it is treated as an intensity plus opacity texture. - If any colour in the palette is not grey and there is no transparency chunk, it is treated as a full RGB texture. - If any colour in the palette is not grey and there is a transparency chunk, it is treated as a full RGB plus alpha texture. Texture nodes that require support for JPEG files shall interpret JPEG files as follows: - Greyscale files (number of components equals 1) are treated as intensity textures. - YCbCr files are treated as full RGB textures. - No other JPEG file types are required. It is recommended that other JPEG files are treated as a full RGB textures. Texture nodes that recommend support for GIF files shall follow the applicable semantics described above for the PNG format.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcimagetexture.htm"
|
|
},
|
|
"IfcInventory": {
|
|
"attributes": {
|
|
"CurrentValue": "An estimate of the current cost value of the inventory.",
|
|
"InventoryType": "A list of the types of inventories from which that required may be selected.",
|
|
"Jurisdiction": "The organizational unit to which the inventory is applicable.",
|
|
"LastUpdateDate": "The date on which the last update of the inventory was carried out.",
|
|
"OriginalValue": "An estimate of the original cost value of the inventory.",
|
|
"ResponsiblePersons": "Persons who are responsible for the inventory."
|
|
},
|
|
"description": "An IfcInventory is a list of items within an enterprise. Various types of inventory can be included. These are identified by the range of values within the inventory type enumeration which currently includes space, asset, furniture. User defined inventories can also be defined for lists of particular types of element such as may be required in operating and maintenance instrucions. Such inventories should be constrained to contain a list of elements of a restricted type. There are a number of actors that can be associated with an inventory, each actor having a role. Principal actors are identified as attributes of the class. Additional actors can be specified through the relationship class IfcRelAssignsToActor in which case roles should be defined through the IfcActorRole class which must be asserted for each defined role. There are a number of costs that can be associated with an inventory, each cost having a role. Principal costs are identified as attributes of the class. Additional costs can be specified through the relationship class IfcRelAssociatesCost in which case roles must be asserted.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedfacilitieselements/lexical/ifcinventory.htm"
|
|
},
|
|
"IfcIrregularTimeSeries": {
|
|
"attributes": {
|
|
"Values": "The collection of time series values."
|
|
},
|
|
"description": "In an irregular time series, unpredictable bursts of data arrive at unspecified points in time, or most time stamps cannot be characterized by a repeating pattern.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctimeseriesresource/lexical/ifcirregulartimeseries.htm"
|
|
},
|
|
"IfcIrregularTimeSeriesValue": {
|
|
"attributes": {
|
|
"ListValues": "A list of time-series values. At least one value is required.",
|
|
"TimeStamp": "The specification of the time point."
|
|
},
|
|
"description": "The IfcIrregularTimeSeriesValue describes a value (or set of values) at a particular time point.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctimeseriesresource/lexical/ifcirregulartimeseriesvalue.htm"
|
|
},
|
|
"IfcJunctionBoxType": {
|
|
"description": "An IfcJunctionBoxType defines a particular type of junction box which is a housing inside which cables from electrical components are connected electrically. *Use Definitions* An IfcJunctionBoxType is a subtype of IfcFlowFittingType and provides for all forms of junction boxes. Usage of IfcJunctionBoxType defines the parameters for one or more occurrences of IfcFlowFitting. *Property Set Use Definition*: There are no property sets currently defined for IfcJunctionBoxType. *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"NOTDEFINED": "Undefined type.",
|
|
"USERDEFINED": "User-defined type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcjunctionboxtype.htm"
|
|
},
|
|
"IfcLShapeProfileDef": {
|
|
"attributes": {
|
|
"CentreOfGravityInX": "Location of centre of gravity along the x axis measured from the center of the bounding box.",
|
|
"CentreOfGravityInY": "Location of centre of gravity along the Y axis measured from the center of the bounding box.",
|
|
"Depth": "Leg length, see illustration above (= h).",
|
|
"EdgeRadius": "Edge radius according the above illustration (= r2). If it is not given, zero is assumed.",
|
|
"FilletRadius": "Fillet radius according the above illustration (= r1). If it is not given, zero is assumed.",
|
|
"LegSlope": "Slope of leg of the profile. If it is not given, zero is assumed.",
|
|
"Thickness": "Constant wall thickness of profile, see illustration above (= ts).",
|
|
"Width": "Leg length, see illustration above (= b). If not given, the value of the Depth attribute is applied to Width."
|
|
},
|
|
"description": "Definition from IAI: The IfcLShapeProfileDef defines a section profile that provides the defining parameters of an L-shaped section (equilateral L profiles are also covered by this entity) to be used by the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration. The shorter leg has the same direction as the positive x-axis, the longer or equal leg the same as the positive y-axis. The centre of the position coordinate system is in the profiles centre of the ~~gravity~~ bounding box. The centre of gravity, if given, is located in x direction along the negative x axis, the offset value is given by the offset parameter CentreOfGravityInX, and in y-direction along the negative y axis, the offset value is given by the offset parameter CentreOfGravityInY. Illustration: Table: Parameters of equal-sided and non-equal sided L-shaped section definition",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifclshapeprofiledef.htm"
|
|
},
|
|
"IfcLaborResource": {
|
|
"attributes": {
|
|
"SkillSet": "The skill set required for this type of labor."
|
|
},
|
|
"description": "An IfcLaborResource is used in construction with particular skills or crafts required to perform certain types of construction or management related work. Labor resources do not identify individual persons (i.e. IfcActors) for cost estimating purpose.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstructionmgmtdomain/lexical/ifclaborresource.htm"
|
|
},
|
|
"IfcLampType": {
|
|
"description": "An IfcLampType is a type of device that is designed to emit light. *Use Definitions* An IfcLampType provides for all forms of lamp and its usage defines the parameters for one or more occurrences of IfcFlowTerminal. Instances of IfcFlowTerminal that are defined as types of IfcLampType are connected via instances of IfcDistributionPort to an instance of IfcFlowTerminal that is defined as a type of IfcLightFixtureType. Rendering using lighting data is achieved using light source entities within the presentation capabilities of IFC. *Property Set Use Definition*: The property sets relating to the IfcLampType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcLampType are part of this IFC release: - Pset_LampTypeCommon: property set for properties that are common to all types of lamp installed within a light fixture, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"COMPACTFLUORESCENT": "A fluorescent lamp having a compact form factor produced by shaping the tube.",
|
|
"FLUORESCENT": "A typically tubular discharge lamp in which most of the light is emitted by one or several layers of phosphors excited by ultraviolet radiation from the discharge.",
|
|
"HIGHPRESSUREMERCURY": "A discharge lamp in which most of the light is emitted by exciting mercury at high pressure.",
|
|
"HIGHPRESSURESODIUM": "A discharge lamp in which most of the light is emitted by exciting sodium at high pressure.",
|
|
"METALHALIDE": "A discharge lamp in which most of the light is emitted by exciting a metal halide.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"TUNGSTENFILAMENT": "A lamp that emits light by passing an electrical current through a tungsten wire filament in a near vacuum.",
|
|
"USERDEFINED": "User-defined type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifclamptype.htm"
|
|
},
|
|
"IfcLibraryInformation": {
|
|
"attributes": {
|
|
"LibraryReference": "Information on the library being referenced.",
|
|
"Name": "The name which is used to identify the library.",
|
|
"Publisher": "Information of the organization that acts as the library publisher.",
|
|
"Version": "Identifier for the library version used for reference.",
|
|
"VersionDate": "Date of the referenced version of the library."
|
|
},
|
|
"description": "An IfcLibraryInformation is a class that describes a library where a library is a structured store of information, normally organized in a manner which allows information lookup through an index or reference value. IfcLibraryInformation provides the library name and optional version, version date and publisher attributes.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifclibraryinformation.htm"
|
|
},
|
|
"IfcLibraryReference": {
|
|
"attributes": {
|
|
"ReferenceIntoLibrary": "The library information that is being referenced."
|
|
},
|
|
"description": "An IfcLibraryReference is a reference into a library of information by location (as an URL). It also provides an optional inherited ItemReference key to allow more specific references to library sections or tables, and the inherited Name attribute allows for a human interpretable identification of the library item. Also, general information on the external library can be given through IfcLibraryInformation, accessed by ReferenceIntoLibrary.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifclibraryreference.htm"
|
|
},
|
|
"IfcLightDistributionData": {
|
|
"attributes": {
|
|
"LuminousIntensity": "The luminous intensity distribution measure for this pair of main and secondary plane angles according to the light distribution curve chosen.",
|
|
"MainPlaneAngle": "The main plane angle (A, B or C angles, according to the light distribution curve chosen).",
|
|
"SecondaryPlaneAngle": "The list of secondary plane angles (the \u03b1, \u03b2 or \u03b3 angles) according to the light distribution curve chosen. > NOTE: The _SecondaryPlaneAngle_ and _LuminousIntensity_ lists are corresponding lists."
|
|
},
|
|
"description": "The IfcLightDistributionData defines the luminous intensity of a light source given at a particular main plane angle. It is based on some standardized light distribution curves, the MainPlaneAngle is either the - A angle; if the IfcLightDistributionCurveEnum is set to TYPE_A - B angle; if the IfcLightDistributionCurveEnum is set to TYPE_B - C angle; if the IfcLightDistributionCurveEnum is set to TYPE_C For each MainPlaneAngle (considered as being the row of a table) a list of _SecondaryPlaneAngle'_s are given (considered to be the columns of a table). They are either the: - \u03b1 angle; if the IfcLightDistributionCurveEnum is set to TYPE_A - \u03b2 angle; if the IfcLightDistributionCurveEnum is set to TYPE_B - \u03b3 angle; if the IfcLightDistributionCurveEnum is set to TYPE_C For each pair of MainPlaneAngle and SecondaryPlaneAngle the LuminousIntensity is provides (the unit is given by the IfcUnitAssignment referring to the LuminousIntensityDistributionUnit, normally cd/klm).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifclightdistributiondata.htm"
|
|
},
|
|
"IfcLightFixtureType": {
|
|
"description": "An IfcLightFixtureType is a container type that is designed for the purpose of housing one or more lamps and the devices that control, restrict or vary their emission. *Use Definitions* An IfcLightFixtureType provides for all forms of light fixture and its usage defines the parameters for one or more occurrences of IfcFlowTerminal. Instances of IfcFlowTerminal that are defined as types of IfcLightFixtureType have one or more instances of IfcFlowTerminal that are defined as types of IfcLampType connected using instances of IfcDistributionPort. Rendering using lighting data is achieved using light source entities within the presentation capabilities of IFC. *Property Set Use Definition*: The property sets relating to the IfcLightFixtureType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcLightFixtureType are part of this IFC release: - Pset_ElectricalDeviceCommon: property set for properties that are common to all types of electrical devices, if available - Pset_LightFixtureTypeCommon: property set for properties that are common to all types of light fixture, if available - Pset_LightFixtureTypeThermal: specific property set for the thermal properties of a light fixture, if available - Pset_LightFixtureTypeExitSign: specific property set for the properties of an exit sign, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"DIRECTIONSOURCE": "A light fixture that is considered to have a length or surface area from which it emits light in a direction. A light fixture containing one or more fluorescent lamps is an example of a direction source.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"POINTSOURCE": "A light fixture that is considered to have negligible area and that emit light with approximately equal intensity in all directions. A light fixture containing a tungsten, halogen or similar bulb is an example of a point source.",
|
|
"USERDEFINED": "User-defined type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifclightfixturetype.htm"
|
|
},
|
|
"IfcLightIntensityDistribution": {
|
|
"attributes": {
|
|
"DistributionData": "Light distribution data applied to the light source. It is defined by a list of main plane angles (B or C according to the light distribution curve chosen) that includes (for each B or C angle) a second list of secondary plane angles (the \u03b2 or \u03b3 angles) and the according luminous intensity distribution measures.",
|
|
"LightDistributionCurve": "Standardized light distribution curve used to define the luminous intensity of the light in all directions."
|
|
},
|
|
"description": "The IfcLightIntensityDistribution defines the the luminous intensity of a light source that changes according to the direction of the ray. It is based on some standardized light distribution curves, which are defined by the LightDistributionCurve attribute.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifclightintensitydistribution.htm"
|
|
},
|
|
"IfcLightSource": {
|
|
"attributes": {
|
|
"AmbientIntensity": "Definition from VRML97 - ISO/IEC 14772-1:1997: The ambientIntensity specifies the intensity of the ambient emission from the light. Light intensity may range from 0.0 (no light emission) to 1.0 (full intensity).",
|
|
"Intensity": "Definition from VRML97 - ISO/IEC 14772-1:1997: The intensity field specifies the brightness of the direct emission from the ligth. Light intensity may range from 0.0 (no light emission) to 1.0 (full intensity).",
|
|
"LightColour": "Definition from ISO/CD 10303-46:1992: Based on the current lighting model, the colour of the light to be used for shading. Definition from VRML97 - ISO/IEC 14772-1:1997: The color field specifies the spectral color properties of both the direct and ambient light emission as an RGB value.",
|
|
"Name": "The name given to the light source in presentation."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: The light source entity is determined by the reflectance specified in the surface style rendering. Lighting is applied on a surface by surface basis: no interactions between surfaces such as shadows or reflections are defined.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifclightsource.htm"
|
|
},
|
|
"IfcLightSourceAmbient": {
|
|
"description": "Definition from ISO/CD 10303-46:1992: The light source ambient entity is a subtype of light source. It lights a surface independent of the surface's orientation and position.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifclightsourceambient.htm"
|
|
},
|
|
"IfcLightSourceDirectional": {
|
|
"attributes": {
|
|
"Orientation": "Definition from ISO/CD 10303-46:1992: This direction is the direction of the light source. Definition from VRML97 - ISO/IEC 14772-1:1997: The direction field specifies the direction vector of the illumination emanating from the light source in the local coordinate system. Light is emitted along parallel rays from an infinite distance away."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: The light source directional is a subtype of light source. This entity has a light source direction. With a conceptual origin at infinity, all the rays of the light are parallel to this direction. This kind of light source lights a surface based on the surface's orientation, but not position. Definition from ISO/IEC 14772-1:1997: The directional light node defines a directional light source that illuminates along rays parallel to a given 3-dimensional vector. Directional light nodes do not attenuate with distance. Directional light nodes are specified in the local coordinate system and are affected by ancestor transformations.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifclightsourcedirectional.htm"
|
|
},
|
|
"IfcLightSourceGoniometric": {
|
|
"attributes": {
|
|
"ColourAppearance": "Artificial light sources are classified in terms of their color appearance. To the human eye they all appear to be white; the difference can only be detected by direct comparison. Visual performance is not directly affected by differences in color appearance.",
|
|
"ColourTemperature": "The color temperature of any source of radiation is defined as the temperature (in Kelvin) of a black-body or Planckian radiator whose radiation has the same chromaticity as the source of radiation. Often the values are only approximate color temperatures as the black-body radiator cannot emit radiation of every chromaticity value. The color temperatures of the commonest artificial light sources range from less than 3000K (warm white) to 4000K (intermediate) and over 5000K (daylight).",
|
|
"LightDistributionDataSource": "The data source from which light distribution data is obtained.",
|
|
"LightEmissionSource": "Identifies the types of light emitter from which the type required may be set.",
|
|
"LuminousFlux": "Luminous flux is a photometric measure of radiant flux, i.e. the volume of light emitted from a light source. Luminous flux is measured either for the interior as a whole or for a part of the interior (partial luminous flux for a solid angle). All other photometric parameters are derivatives of luminous flux. Luminous flux is measured in lumens (lm). The luminous flux is given as a nominal value for each lamp.",
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|
"Position": "The position of the light source. It is used to orientate the light distribution curves."
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|
},
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|
"description": "The IfcLightSourceGoniometric defines a light source for which exact lighting data is available. It specifies the type of a light emitter, defines the position and orientation of a light distribution curve and the data concerning lamp and photometric information. Illustration: Example of a light emitter having two light sources (of type IfcLightSourceGoniometric).",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifclightsourcegoniometric.htm"
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|
},
|
|
"IfcLightSourcePositional": {
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|
"attributes": {
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|
"ConstantAttenuation": "Definition from ISO/CD 10303-46:1992: This real indicates the value of the attenuation in the lighting equation that is constant.",
|
|
"DistanceAttenuation": "Definition from ISO/CD 10303-46:1992: This real indicates the value of the attenuation in the lighting equation that proportional to the distance from the light source.",
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|
"Position": "Definition from ISO/CD 10303-46:1992: The Cartesian point indicates the position of the light source. Definition from VRML97 - ISO/IEC 14772-1:1997: A Point light node illuminates geometry within radius of its location.",
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|
"QuadricAttenuation": "Definition from the IAI: This real indicates the value of the attenuation in the lighting equation that proportional to the square value of the distance from the light source.",
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|
"Radius": "The maximum distance from the light source for a surface still to be illuminated. Definition from VRML97 - ISO/IEC 14772-1:1997: A Point light node illuminates geometry within radius of its location."
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|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: The light source positional entity is a subtype of light source. This entity has a light source position and attenuation coefficients. A positional light source affects a surface based on the surface's orientation and position. Definition from ISO/IEC 14772-1:1997: The Point light node specifies a point light source at a 3D location in the local coordinate system. A point light source emits light equally in all directions; that is, it is omnidirectional. Point light nodes are specified in the local coordinate system and are affected by ancestor transformations. Point light node's illumination falls off with distance as specified by three attenuation coefficients. The attenuation factor is where r is the distance from the light to the surface being illuminated. The default is no attenuation. An attenuation value of (0, 0, 0) is identical to (1, 0, 0). Attenuation values shall be greater than or equal to zero.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifclightsourcepositional.htm"
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|
},
|
|
"IfcLightSourceSpot": {
|
|
"attributes": {
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|
"BeamWidthAngle": "Definition from VRML97 - ISO/IEC 14772-1:1997: The beamWidth field specifies an inner solid angle in which the light source emits light at uniform full intensity. The light source's emission intensity drops off from the inner solid angle (beamWidthAngle) to the outer solid angle (spreadAngle).",
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|
"ConcentrationExponent": "Definition from ISO/CD 10303-46:1992: This real is the exponent on the cosine of the angle between the line that starts at the position of the spot light source and is in the direction of the orientation of the spot light source and a line that starts at the position of the spot light source and goes through a point on the surface being shaded. NOTE: This attribute does not exists in ISO/IEC 14772-1:1997.",
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|
"Orientation": "Definition from ISO/CD 10303-46:1992: This is the direction of the axis of the cone of the light source specified in the coordinate space of the representation being projected.. Definition from VRML97 - ISO/IEC 14772-1:1997: The direction field specifies the direction vector of the light's central axis defined in the local coordinate system.",
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|
"SpreadAngle": "Definition from ISO/CD 10303-46:1992: This planar angle measure is the angle between the line that starts at the position of the spot light source and is in the direction of the spot light source and any line on the boundary of the cone of influence. Definition from VRML97 - ISO/IEC 14772-1:1997: The cutOffAngle (name of spread angle in VRML) field specifies the outer bound of the solid angle. The light source does not emit light outside of this solid angle."
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|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: The light source spot entity is a subtype of light source. Spot light source entities have a light source colour, position, direction, attenuation coefficients, concentration exponent, and spread angle. If a point lies outside the cone of influence of a light source of this type as determined by the light source position, direction and spread angle its colour is not affected by that light source. Definition from ISO/IEC 14772-1:1997: The Spot light node defines a light source that emits light from a specific point along a specific direction vector and constrained within a solid angle. Spot lights may illuminate geometry nodes that respond to light sources and intersect the solid angle defined by the Spot light. Spot light nodes are specified in the local coordinate system and are affected by ancestors' transformations. Figure (from VRML97): Definition of spot light",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifclightsourcespot.htm"
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|
},
|
|
"IfcLine": {
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|
"attributes": {
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|
"Dir": "The direction of the line, the magnitude and units of Dir affect the parameterization of the line.",
|
|
"Pnt": "The location of the line."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A line is an unbounded curve with constant tangent direction. A line is defined by a point and a direction. The positive direction of the line is in the direction of the Dir vector. The line is parameterized as follows: and the parametric range is -\u00a5 < u < \u00a5",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcline.htm"
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|
},
|
|
"IfcLinearDimension": {
|
|
"description": "The linear dimension is a draughting callout that presents the length (or distance) between two points along a linear curve. It consists of a dimension curve and optionally one or two projection curves. Illustration:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifclineardimension.htm"
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|
},
|
|
"IfcLocalPlacement": {
|
|
"attributes": {
|
|
"PlacementRelTo": "Reference to Object that provides the relative placement by its local coordinate system. If it is omitted, then the local placement is given to the WCS, established by the geometric representation context.",
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|
"RelativePlacement": "Geometric placement that defines the transformation from the related coordinate system into the relating. The placement can be either 2D or 3D, depending on the dimension count of the coordinate system."
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|
},
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|
"description": "Definition from IFC: The IfcLocalPlacement defines the relative placement of a product in relation to the placement of another product or the absolute placement of a product within the geometric representation context of the project. The IfcLocalPlacement allows that an IfcProduct can be placed by this IfcLocalPlacement (through the attribute_ObjectPlacement_) within the local coordinate system of the object placement of another IfcProduct, which is referenced by the PlacementRelTo. Rules to prevent cyclic relative placements have to be introduced on the application level. If the PlacementRelTo is not given, then the IfcProduct is placed absolutely within the world coordinate system. *Geometry use definitions*: The following conventions shall apply as default relative positions if the relative placement is used. The conventions are given for all five direct subtypes of IfcProduct, the IfcSpatialStructureElement, IfcElement, IfcAnnotation, IfcGrid, IfcPort. More detailed placement information is given at the level of subtypes of those five types mentioned. - For the subtypes of IfcSpatialStructureElement the following conventions apply IfcSite shall be placed absolutely within the world coordinate system established by the geometric representation context of the IfcProject IfcBuilding shall be placed relative to the local placement of IfcSite IfcBuildingStorey shall be placed relative to the local placement of IfcBuilding - For IfcGrid and IfcAnnotation the convention applies that it shall be placed relative to the local placement of its container (IfcSite, IfcBuilding, IfcBuildingStorey) it should be the same container element that is referenced by the IfcRelContainedInSpatialStructure containment relationship, - For IfcPort the convention applies that it shall be placed relative to the local placement of the element it belongs to (IfcElement) it should be the same element that is referenced by the IfcRelConnectsPortToElement connection relationship, - For IfcElement the convention applies that it shall be placed relative: to the local placement of its container (IfcSite, IfcBuilding, IfcBuildingStorey) it should be the same container element that is referenced by the IfcRelContainedInSpatialStructure containment relationship, to the local placement of the IfcElement to which it is tied by an element composition relationship for features that are located relative to the main component (such as openings), as expressed by IfcRelVoidsElement and_IfcRelProjectsElement_, for elements that fill an opening (such as doors or windows), as expressed by_IfcRelFillsElement_, for coverings that cover the element, as expressed by_IfcRelCoversBldgElements,_ for sub components that are aggregated to the main component, as expressed by IIfcRelAggregates and IfcRelNests) If the PlacementRelTo relationship is not given, then it defaults to an absolute placement within the world coordinate system established by the referenced geometric representation context within the project.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifclocalplacement.htm"
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},
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|
"IfcLocalTime": {
|
|
"attributes": {
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|
"DaylightSavingOffset": "The offset of daylight saving time from basis time.",
|
|
"HourComponent": "The number of hours of the local time.",
|
|
"MinuteComponent": "The number of minutes of the local time.",
|
|
"SecondComponent": "The number of seconds of the local time.",
|
|
"Zone": "The relationship of the local time to coordinated universal time."
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|
},
|
|
"description": "Definition from ISO/CD 10303-41:1992: A moment of occurrence measured by hour, minute, and second. It represents one instant of time on a 24 hour clock.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcdatetimeresource/lexical/ifclocaltime.htm"
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|
},
|
|
"IfcLoop": {
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|
"description": "Definition from ISO/CD 10303-42:1992: A loop is a topological entity constructed from a single vertex, or by stringing together connected (oriented) edges, or linear segments beginning and ending at the same vertex. It is typically used to bound a face lying on a surface. A loop has dimensionality of 0 or 1. The domain of a 0-dimensional loop is a single point. The domain of a 1-dimensional loop is a connected, oriented curve, but need not to be manifold. As the loop is a circle, the location of its beginning/ending point is arbitrary. The domain of the loop includes its bounds, an 0 \u2264 \u039e < \u221e. A loop is represented by a single vertex, or by an ordered collection of oriented edges, or by an ordered collection of points. A loop is a graph, so M and the graph genus G^l^ may be determined by the graph traversal algorithm. Since M= 1, the Euler equation (1) reduces in this case to where V and E~l~ are the number of unique vertices and oriented edges in the loop and G^l^ is the genus of the loop. Informal propositions: - A loop has a finite extent. - A loop describes a closed (topological) curve with coincident start and end vertices.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcloop.htm"
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|
},
|
|
"IfcManifoldSolidBrep": {
|
|
"attributes": {
|
|
"Outer": "A closed shell defining the exterior boundary of the solid. The shell normal shall point away from the interior of the solid."
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|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A manifold solid B-rep is a finite, arcwise connected volume bounded by one or more surfaces, each of which is a connected, oriented, finite, closed 2-manifold. There is no restriction on the genus of the volume, nor on the number of voids within the volume. The Boundary Representation (B-rep) of a manifold solid utilizes a graph of edges and vertices embedded in a connected, oriented, finite, closed two manifold surface. The embedded graph divides the surface into arcwise connected areas known as faces. The edges and vertices, therefore, form the boundaries of the face and the domain of a face does not include its boundaries. The embedded graph may be disconnected and may be a pseudo graph. The graph is labeled; that is, each entity in the graph has a unique identity. The geometric surface definition used to specify the geometry of a face shall be 2-manifold embeddable in the plane within the domain of the face. In other words, it shall be connected, oriented, finite, non-self-intersecting, and of surface genus 0. Faces do not intersect except along their boundaries. Each edge along the boundary of a face is shared by at most one other face in the assemblage. The assemblage of edges in the B-rep do not intersect except at their boundaries (i.e., vertices). The geometry curve definition used to specify the geometry of an edge shall be arcwise connected and shall not self intersect or overlap within the domain of the edge. The geometry of an edge shall be consistent with the geometry of the faces of which it forms a partial bound. The geometry used to define a vertex shall be consistent with the geometry of the faces and edges of which it forms a partial bound. A B-rep is represented by one or more closed shells which shall be disjoint. One shell, the outer, shall completely enclose all the other shells and no other shell may enclose a shell. The facility to define a B-rep with one or more internal voids is provided by a subtype. The following version of the Euler formula shall be satisfied, where V, E, F, L~l~ and S are the numbers of unique vertices, edges, faces, loop uses and shells in the model and G^s^ is the sum of the genus of the shells. Informal proposition: - The dimensionality of a manifold solid brep shall be 3. - The extent of the manifold solid brep shall be finite and non-zero. - All elements of the manifold solid brep shall have defined associated geometry. - The shell normals shall agree with the B-rep normal and point away from the solid represented by the B-rep. - Each face shall be referenced only once by the shells of the manifold solid brep. - The Euler equation shall be satisfied for the boundary representation, where the genus term \"shell term\" us the sum of the genus values for the shells of the brep.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcmanifoldsolidbrep.htm"
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},
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|
"IfcMappedItem": {
|
|
"attributes": {
|
|
"MappingSource": "A representation map that is the source of the mapped item. It can be seen as a block (or cell or marco) definition.",
|
|
"MappingTarget": "A representation item that is the target onto which the mapping source is mapped. It is constraint to be a Cartesian transformation operator."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-43:1992: A mapped item is the use of an existing representation (the mapping source - mapped representation) as a representation item in a second representation. Definition from IAI: The IfcMappedItem is the inserted instance of a source definition (to be compared with a block / shared cell / macro definition). The instance is inserted by applying a Cartesian transformation operator as the MappingTarget. Informal Propositions - A mapped item shall not be self-defining by participating in the definition of the representation being mapped. - The dimensionality of the mapping source and the mapping target has to be the same, if the mapping source is a geometric representation item.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcmappeditem.htm"
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},
|
|
"IfcMaterial": {
|
|
"attributes": {
|
|
"ClassifiedAs": "Reference to the relationship pointing to the classification(s) of the material.",
|
|
"HasRepresentation": "Reference to the _IfcMaterialDefinitionRepresentation_ that provides presentation information to a representation common to this material in style definitions.",
|
|
"Name": "Name of the material."
|
|
},
|
|
"description": "A homogeneous substance that can be used to form elements.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialresource/lexical/ifcmaterial.htm"
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|
},
|
|
"IfcMaterialClassificationRelationship": {
|
|
"attributes": {
|
|
"ClassifiedMaterial": "Material being classified.",
|
|
"MaterialClassifications": "The material classifications identifying the type of material."
|
|
},
|
|
"description": "Relationship assigning classifications to materials.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialresource/lexical/ifcmaterialclassificationrelationship.htm"
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|
},
|
|
"IfcMaterialDefinitionRepresentation": {
|
|
"attributes": {
|
|
"RepresentedMaterial": "Reference to the material to which the representation applies."
|
|
},
|
|
"description": "The IfcMaterialDefinitionRepresentation defines presentation information relating to IfcMaterial. It allows for multiple presentations of the same material for different geometric representation contexts.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcmaterialdefinitionrepresentation.htm"
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|
},
|
|
"IfcMaterialLayer": {
|
|
"attributes": {
|
|
"IsVentilated": "Indication of whether the material layer represents an air layer (or cavity). * set to TRUE if the material layer is an air gap and provides air exchange from the layer to the outside air. * set to UNKNOWN if the material layer is an air gap and does not provide air exchange (or when this information about air exchange of the air gap is not available). * set to FALSE if the material layer is a solid material layer (the default).",
|
|
"LayerThickness": "The thickness of the layer (dimension measured along the local x-axis of Mls LCS, in positive direction).",
|
|
"Material": "Optional reference to the material from which the layer is constructed. Note, that if this value is not given, it does not denote a layer with no material (an air gap), it only means that the material is not specified at that point.",
|
|
"ToMaterialLayerSet": "Reference to the material layer set, in which the material layer is included."
|
|
},
|
|
"description": "A single and identifiable part of an element which is constructed of a number of layers (one or more). Each IfcMaterialLayer is located relative to the referencing IfcMaterialLayerSet.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialresource/lexical/ifcmateriallayer.htm"
|
|
},
|
|
"IfcMaterialLayerSet": {
|
|
"attributes": {
|
|
"LayerSetName": "The name by which the material layer set is known.",
|
|
"MaterialLayers": "Identification of the layers from which the material layer set is composed.",
|
|
"TotalThickness": "Total thickness of the material layer set is derived from the function IfcMlsTotalThickness. IfcMlsTotalThickness(SELF)"
|
|
},
|
|
"description": "Definition from IAI: A designation by which materials of an element constructed of a number of material layers is known and through which the relative positioning of individual layers can be expressed. *Geometry use* Each IfcMaterialLayerSet implicitly defines a reference line (MlsBase), to which the start of the first IfcMaterialLayer is aligned. The total thickness of a layer set is calculated from the individual layer thicknesses, the first layer starting from the reference line and following layers being placed on top of the previous (no gaps or overlaps).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialresource/lexical/ifcmateriallayerset.htm"
|
|
},
|
|
"IfcMaterialLayerSetUsage": {
|
|
"attributes": {
|
|
"DirectionSense": "Denotion whether the layer set is oriented in positive or negative sense relative to the material layer set base. The meaning of \"positive\" and \"negative\" needs to be established in the geometry use definitions. See examples at _IfcMaterialLayerSetUsage_ for a guideline as well.",
|
|
"ForLayerSet": "The _IfcMaterialLayerSet_ set to which the usage is applied.",
|
|
"LayerSetDirection": "Orientation of the layer set relative to element reference geometry. The meaning of the value of this attribute shall be specified in the geometry use section for each element. For extruded shape representation, direction can be given along the extrusion path (e.g. for slabs) or perpendicular to it (e.g. for walls). > NOTE the LayerSetDirection for IfcWallStandardCase shall be AXIS2 (i.e. the y-axis) and for standard IfcSlab it shall be AXIS3 (i.e. the z-axis).",
|
|
"OffsetFromReferenceLine": "Offset of the material layer set base line (MlsBase) from reference geometry (line or plane). The offset can be positive or negative, unless restricted for a particular building element type in its use definition or by implementer agreement. The reference geometry for each relevant subtype of _IfcElement_ is defined in use definition for the element. Examples are given in the use definition of _IfcMaterialLayerSetUsage_."
|
|
},
|
|
"description": "Definition from IAI: Determines the usage of IfcMaterialLayerSet in terms of its location and orientation relative to the associated element geometry. The location of material layer set shall be compatible with the building element geometry (i.e. material layers shall fit inside the element geometry). The rules to ensure the compatibility depend on the type of the building element. The IfcMaterialLayerSetUsage is always assigned to an individual occurrence object only (i.e. to relevant subtypes of IfcElement). The IfcMaterialLayerSet, referenced by ForLayerSet can however be shared among several occurrence objects. If the element type is available (i.e. the relevant subtype of IfcElementType, then the IfcMaterialLayerSet can be assigned to the type object. The assignment between a subtype of IfcElement and the IfcMaterialLayerSetUsage_is handled by _IfcRelAssociatesMaterial. Use Definition The IfcMaterialLayerSetUsage is primarily intended to be associated with planar building elements having a constant thickness. With further agreements on the interpretation of LayerSetDirection, the usage can be extended also to other cases, e.g. to curved building elements, provided that the material layer thicknesses are constant. Generally, an element may be layered in any of its primary directions, denoted by its x, y or z axis. The geometry use definitions at each specific types of building element will determine the applicable LayerSetDirection. Fig 1: shows an example of the use of IfcMaterialLayerSetUsage aligned to the axis of a wall. Fig 2: shows an example of the use of IfcMaterialLayerSetUsage aligned to a slab. Fig 3: shows an example of the use of IfcMaterialLayerSetUsage aligned to a roof slab with non-perpendicular extrusion.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialresource/lexical/ifcmateriallayersetusage.htm"
|
|
},
|
|
"IfcMaterialList": {
|
|
"attributes": {
|
|
"Materials": "Materials used in a composition of substances."
|
|
},
|
|
"description": "A list of the different materials that are used in an element.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialresource/lexical/ifcmateriallist.htm"
|
|
},
|
|
"IfcMaterialProperties": {
|
|
"attributes": {
|
|
"Material": "Reference to the material to which the set of properties is assigned."
|
|
},
|
|
"description": "Abstract supertype of all container classes with material properties, both those defined in IFC specification and those defined by users as extended material properties.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcmaterialproperties.htm"
|
|
},
|
|
"IfcMeasureWithUnit": {
|
|
"attributes": {
|
|
"UnitComponent": "The unit in which the physical quantity is expressed.",
|
|
"ValueComponent": "The value of the physical quantity when expressed in the specified units."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-41:1992: A measure with unit is the specification of a physical quantity as defined in ISO 31 (clause 2). IfcMeasureWithUnit has two usages: 1. For representing measure value together with its unit on the entity type attribute level; thus overriding the IFC model global unit assignments. 2. For conversion based unit to give the conversion rate and its base.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcmeasurewithunit.htm"
|
|
},
|
|
"IfcMechanicalConcreteMaterialProperties": {
|
|
"attributes": {
|
|
"AdmixturesDescription": "Description of the admixtures added to the concrete mix.",
|
|
"CompressiveStrength": "The compressive strength of the concrete.",
|
|
"MaxAggregateSize": "The maximum aggregate size of the concrete.",
|
|
"ProtectivePoreRatio": "The protective pore ratio indicating the frost-resistance of the concrete.",
|
|
"WaterImpermeability": "Description of the water impermeability denoting the water repelling properties.",
|
|
"Workability": "Description of the workability of the fresh concrete defined according to local standards."
|
|
},
|
|
"description": "Mechanical material properties for concrete.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcmechanicalconcretematerialproperties.htm"
|
|
},
|
|
"IfcMechanicalFastener": {
|
|
"attributes": {
|
|
"NominalDiameter": "The nominal diameter describing the cross-section size of the fastener.",
|
|
"NominalLength": "The nominal length describing the longitudinal dimensions of the fastener."
|
|
},
|
|
"description": "Fasteners connecting building elements mechanically. General usage The exact type information of the IfcMechanicalFastener is given in the ObjectType attribute inherited from IfcObject. Standard type designations are provided for guideline below. Geometry Use Definitions: The geometric representation of IfcMechanicalFastener is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined in the supertype IfcElementComponent. Standard Geometric Representation The use of Standard Geometric Representations is defined in the supertype IfcElementComponent.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcmechanicalfastener.htm"
|
|
},
|
|
"IfcMechanicalFastenerType": {
|
|
"description": "The element type (IfcMechanicalFastenerType) defines a list of commonly shared property set definitions of a fastener and an optional set of product representations. It is used to define mechanical fasteners mainly within structural and building services domains (i.e. the specific type information common to all occurrences of that type). The occurrences of the IfcMechanicalFastenerType are represented by instances of IfcMechanicalFastener. General usage The exact type information of the IfcMechanicalFastenerType is given in the ElementType attribute inherited from IfcElementType. Standard type designations are provided for guideline below.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcmechanicalfastenertype.htm"
|
|
},
|
|
"IfcMechanicalMaterialProperties": {
|
|
"attributes": {
|
|
"DynamicViscosity": "A measure of the viscous resistance of the material.",
|
|
"PoissonRatio": "A measure of the lateral deformations in the elastic range.",
|
|
"ShearModulus": "A measure of the shear modulus of elasticity of the material.",
|
|
"ThermalExpansionCoefficient": "A measure of the expansion coefficient for warming up the material about one Kelvin.",
|
|
"YoungModulus": "A measure of the Young's modulus of elasticity of the material."
|
|
},
|
|
"description": "This is a collection of mechanical material properties normally used for structural analysis purpose. It contains all properties which are independent of the actual material type.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcmechanicalmaterialproperties.htm"
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},
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"IfcMechanicalSteelMaterialProperties": {
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"attributes": {
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"HardeningModule": "A measure of the hardening module of the material (slope of stress versus strain curve after yield range).",
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"PlasticStrain": "A measure of the permanent displacement, as in slip or twinning, which remains after the stress has been removed. Currently applied to a strain of 0.2% proportional stress of the material.",
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"ProportionalStress": "A measure of the proportional stress of the material. It describes the stress before the first plastic deformation occurs and is commonly measured at a deformation of 0.01%.",
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"Relaxations": "Measures of decrease in stress over long time intervals resulting from plastic flow. Different relaxation values for different initial stress levels for a material may be given.",
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"UltimateStrain": "A measure of the (engineering) strain at the state of ultimate stress of the material.",
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"UltimateStress": "A measure of the ultimate stress of the material.",
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"YieldStress": "A measure of the yield stress (or characteristic 0.2 percent proof stress) of the material."
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},
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"description": "This is a collection of mechanical properties related to steel (or other metallic and isotropic) materials. NOTE: In certain dimensioning calculations a secant modulus is used instead of the Young\u00b4s modulus. Essentially, this is the same measure, but with a slightly different physical meaning. In such cases, i. e. when a secant modulus is needed, the value of the inherited attribute YoungModulus should be applied. Illustration:",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcmechanicalsteelmaterialproperties.htm"
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},
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|
"IfcMember": {
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"description": "An IfcMember is a structural member designed to carry loads between or beyond points of support. It is not required to be load bearing. The location of the member (being horizontal, vertical or sloped) is not relevant to its definition (in contrary to IfcBeam and IfcColumn).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcmember.htm"
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},
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"IfcMemberType": {
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"description": "The element type (IfcMemberType) defines a list of commonly shared property set definitions of a structural member and an optional set of product representations. It is used to define a structural member specification (i.e. the specific product information that is common to all occurrences of that product type). A structural member type is used to define the common properties of a certain type of a structural member that may be applied to many instances of that type to assign a specific style. Structural member types may be exchanged without being already assigned to occurrences. The occurrences of the IfcMemberType are represented by instances of IfcMember. Use definition for steel members When using the IfcMemberType as the underlying type for steel members within steel construction aware applications the following additional conventions apply: Material association:**** The IfcMemberType is associated with exactly one instance IfcMaterial by the IfcRelAssociatesMaterial relationship. This material association assigns a common material to all occurrences (IfcBeam, IfcColumn or IfcBuildingElementProxy) of the IfcMemberType. If an individual occurrence has its own material assignment (see IfcMember), then this overrides the material assignment given at the IfcMemberType. Geometric representation:**** The IfcMemberType type has (at least) one representation map assigned through the RepresentationMaps relation. The representation map has a full geometric representation given by: - IfcExtrudedAreaSolid for straight beams, - IfcRevolvedAreaSolid for curved beams based on circular arcs, or - IfcSurfaceCurveSweptAreaSolid for all other curved beams. The attribute ProfileName of the extruded IfcProfile instance may contain a standardized name according to local standards. However, a geometric representation of the profile is necessary as specified below. An importing application is allowed to check for the existence of the profile name: in case of identifying it as a standardized name, the corresponding profile geometry and possibly other cross sectional properties can be read from a library. Otherwise the explicit IFC geometry and possible non geometric IfcProfileProperties have to be used. Only 'SweptSolid' representation should be used to represent steel members. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'SweptSolid' The following additional constraints apply to the 'SweptSolid' representation: - Solid: IfcExtrudedAreaSolid shall be supported. - Profile: IfcArbitraryClosedProfileDef, IfcArbitraryOpenProfileDef, IfcArbitraryProfileDefWithVoids, IfcCircleProfileDef, IfcCompositeProfileDef, IfcIShapeProfileDef, IfcRectangleProfileDef, IfcRoundedRectangleProfileDef, IfcCShapeProfileDef, IfcCircleHollowProfileDef, IfcCraneRailAShapeProfileDef, IfcCraneRailFShapeProfileDef, IfcLShapeProfileDef, IfcRectangleHollowProfileDef, IfcTShapeProfileDef, IfcUShapeProfileDef, IfcZShapeProfileDef and IfcAsymmetricIShapeProfileDef. - Extrusion: The extrusion axis shall be perpendicular to the swept profile, i.e. pointing into the direction of the z-axis of the position of the IfcExtrudedAreaSolid. In addition to the full 'SweptSolid' representation a simple representation for the axis of gravity can be used., i.e. as a second IfcRepresentationMap. It represents the neutral axis of stress which is not necessarily in the profiles center of gravity. In this case the following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Axis' - RepresentationType : 'GeometricCurveSet' Position number:**** The position number is specified in the attribute IfcTypeProduct.Tag. Non geometric profile properties:**** Non geometric profile properties (for instance mechanical properties) are specified through IfcProfileProperties (and its specific subtypes). These properties are attached to IfcMemberType by the relationship IfcRelAssociatesProfileProperties. If an individual occurrence has its own profile property assignment (see IfcMember), then this overrides the profile property assignment given at the IfcMemberType. Quantity related properties:**** Quantity related properties, which do not relate to the profile, are specified through IfcElementQuantity (and its specific subtypes). These properties are attached to the IfcMemberType by the relationship IfcRelDefinesByProperties. If an individual occurrence has its own element quantity assignment (see IfcMember), then this overrides the quantity assignment given at the IfcMemberType. The following quantities are foreseen, but will be subjected to the local standard of measurement used:",
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"predefined_types": {
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"BRACE": "A linear element (usually sloped) often used for bracing of a girder or truss.",
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"CHORD": "Upper or lower longitudinal member of a truss, used horizontally or sloped.",
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"COLLAR": "A linear element (usually used horizontally) within a roof structure to connect rafters and posts.",
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"MEMBER": "A linear element within a girder or truss with no further meaning.",
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"MULLION": "A linear element within a curtain wall system to connect two (or more) panels.",
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"NOTDEFINED": "Undefined linear element.",
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"PLATE": "A linear continuous horizontal element in wall framing, such as a head piece or a sole plate.",
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"POST": "A linear member (usually used vertically) within a roof structure to support purlins.",
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"PURLIN": "A linear element (usually used horizontally) within a roof structure to support rafters.",
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"RAFTER": "A linear elements used to support roof slabs or roof covering, usually used with slope.",
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"STRINGER": "A linear element used to support stair or ramp flights, usually used with slope.",
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"STRUT": "A linear element often used within a girder or truss.",
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"STUD": "Vertical element in wall framing.",
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"USERDEFINED": "User-defined linear element."
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|
},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcmembertype.htm"
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|
},
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|
"IfcMetric": {
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|
"attributes": {
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|
"Benchmark": "Enumeration that identifies the type of benchmark data.",
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|
"DataValue": "Value with data type defined by the DataType enumeration.",
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"ValueSource": "Reference source for data values."
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|
},
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"description": "An IfcMetric is used to capture quantitative resultant metrics that can be applied to objectives. IfcMetric is a subtype of IfcConstraint and may be associated with any subtype of IfcObject through the IfcRelAssociatesConstraint relationship in the IfcControlExtension schema. The aim of IfcMetric is to capture the quantitative aspects of a constraint.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstraintresource/lexical/ifcmetric.htm"
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},
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"IfcMonetaryUnit": {
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"attributes": {
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"Currency": "The international enumeration name of the currency."
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|
},
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"description": "IfcMonetaryUnit is a unit to define currency for money.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcmonetaryunit.htm"
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|
},
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|
"IfcMotorConnectionType": {
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|
"description": "An IfcMotorConnectionType provides the means for connecting a motor as the driving device to the driven device. *Use Definitions* An IfcMotorConnectionType is a subtype of IfcEnergyConversionDeviceType that provides for various forms of connection mechanism. Usage of IfcMotorConnectionType defines the parameters for one or more occurrences of IfcEnergyConversionDevice. Parameters are specified through property sets that are enumerated in the IfcMotorConnectionTypeEnum data type. *Property Set Use Definition*: There are no property sets currently defined for IfcMotorConnectionType. *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
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|
"predefined_types": {
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"BELTDRIVE": "An indirect connection made through the medium of a shaped, flexible continuous loop.",
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|
"COUPLING": "An indirect connection made through the medium of the viscosity of a fluid.",
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|
"DIRECTDRIVE": "A direct, physical connection made between the motor and the driven device.",
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|
"NOTDEFINED": "Undefined type.",
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|
"USERDEFINED": "User-defined type."
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|
},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcmotorconnectiontype.htm"
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},
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|
"IfcMove": {
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"attributes": {
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"MoveFrom": "The place from which actors and their associated equipment are moving.",
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"MoveTo": "The place to which actors and their associated equipment are moving.",
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"PunchList": "A list of points concerning a move that require attention."
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},
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"description": "An IfcMove is an activity that moves people, groups within an organization or complete organizations together with their associated furniture and equipment from one place to another. The objects to be moved, normally people, equipment, and furniture, are assigned by the IfcRelAssignsToProcess relationship. Actors, equipment and furniture are moved from one IfcSpatialStructureElement to another. The IfcSpatialStructureElement to be moved from and that to be moved to are assigned to the IfcMove class using the IfcRelAssignsToProcess relationship. The actors (as IfcActor), equipment and furnitures to be moved are assigned to the IfcMove using the IfcRelAssignsToProcess relationship Each IfcMove must have a name. This requirement is enforced by a rule. The inherited attribute OperatesOn refers to the IfcRelAssignsToProcess relationship, keeping the reference to IfcActor, IfcEquipmentElement_and_IfcFurnishingElement. The QuantityInProcess attribute at the relationship object can be used to specify a quantity of the objects to be moved. Constraints may be applied to a move through instances of the IfcConstraint class (or its subtypes) that are associated through the IfcRelAssociatesConstraint relationship class Moves can be nested, i.e. a move object can contain other (more detailed) move objects. This is handled by the IfcRelNests relationship pointing (with RelatingObject) to the containing move and (with RelatedObjects) to the contained (sub)moves. Moves are assigned to a move schedule (represented as IfcWorkSchedule with Purpose attribute 'Move') by using the IfcRelAssignsTask relationship.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcmove.htm"
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},
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"IfcNamedUnit": {
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"attributes": {
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"Dimensions": "The dimensional exponents of the SI base units by which the named unit is defined.",
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|
"UnitType": "The type of the unit."
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|
},
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|
"description": "Definition from ISO/CD 10303-41:1992: A named unit is a unit quantity associated with the word, or group of words, by which the unit is identified.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcnamedunit.htm"
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},
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"IfcObject": {
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"attributes": {
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"IsDefinedBy": "Set of relationships to type or property (statically or dynamically defined) information that further define the object. In case of type information, the associated _IfcTypeObject_ contains the specific information (or type, or style), that is common to all instances of _IfcObject_ referring to the same type.",
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"ObjectType": "The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute _PredefinedType_ is set to USERDEFINED."
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},
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"description": "An IfcObject is the generalization of any semantically treated thing or process. Objects are things as they appear - i.e. occurrences. Objects can be named, using the inherited Name attribute, which should be a user recognizable label for the object occurrence. Further explanations to the object can be given using the inherited Description attribute. The ObjectType attribute is used: - to store the user defined value for all subtypes of IfcObject, where a PredefinedType attribute is given, and its value is set to USERDEFINED. - to provide a type information (could be seen as a very lightweight classifier) of the subtype of IfcObject, if no PredefinedType attribute is given. This is often the case, if no comprehensive list of predefined types is available. Objects are independent pieces of information that might contain or reference other pieces of information. There are four essential kind of relationships in which objects can be involved: - Assignment of other objects - an assignment relationship that refers to other types of objects. See supertype IfcObjectDefinition for more information. - Association to external resources - an association relationship that refers to external sources of information. See supertype IfcObjectDefinition for more information. - Aggregation of other objects - an aggregation relationship that establishes a whole/part relation. See supertype IfcObjectDefinition for more information. - Refinement by type and properties - a refinement relationship (IfcRelDefines) that uses a type definition or (partial) property set definition to define the properties of the object instance. It is a specific - occurrence relationship with implied dependencies (as the occurrence properties depend on the specific properties).",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcobject.htm"
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|
},
|
|
"IfcObjectDefinition": {
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|
"attributes": {
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|
"Decomposes": "References to the decomposition relationship, that allows this object to be a part of the decomposition. An object can only be part of a single decomposition (to allow hierarchical strutures only).",
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|
"HasAssignments": "Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups.",
|
|
"HasAssociations": "Reference to the relationship objects, that associates external references or other resource definitions to the object.. Examples are the association to library, documentation or classification.",
|
|
"IsDecomposedBy": "Reference to the decomposition relationship, that allows this object to be the composition of other objects. An object can be decomposed by several other objects."
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|
},
|
|
"description": "Definition from IAI: An IfcObjectDefinition is the generalization of any semantically treated thing or process, either being a type or an occurrences. Object defintions can be named, using the inherited Name attribute, which should be a user recognizable label for the object occurrence. Further explanations to the object can be given using the inherited Description attribute. Objects are independent pieces of information that might contain or reference other pieces of information. There are three essential kinds of relationships in which object definitions (by their instantiable subtypes) can be involved: - Assignment of other objects - an assignment relationship (IfcRelAssigns) that refers to other types of objects and creates a bi-directional association. The semantic of the assignment is established at the level of the subtypes of the general IfcRelAssigns relationship. There is no dependency implied a priori by the assignment. - Association to external resources - an association relationship (IfcRelAssociates) that refers to external sources of information (most notably a classification or document) and creates a uni-directional association. There is no dependency implied by the association. - Aggregation of other objects - an aggregation relationship (IfcRelDecomposes) that establishes a whole/part relation and creates a bi-directional relation. There is an implied dependency established.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcobjectdefinition.htm"
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|
},
|
|
"IfcObjectPlacement": {
|
|
"attributes": {
|
|
"PlacesObject": "The _IfcObjectPlacement_ shall be used to provide a placement and an object coordinate system for a single instance of _IfcProduct_.",
|
|
"ReferencedByPlacements": "Placements that are given relative to this placement of an object."
|
|
},
|
|
"description": "Abstract supertype for the special types defining the object coordinate system. The IfcObjectPlacement has to be provided for each product that has a shape representation. The object placement can be given: - absolute, i.e. by an axis2 placement, relative to the world coordinate system, - relative, i.e. by an axis2 placement, relative to the object placement of another product, - by grid reference, i.e. by the virtual intersection and reference direction given by two axes of a design grid. In any case the object placement has to unambiguously define the object coordinate system as either two-dimensional axis placement (IfcAxis2Placement2D) or three-dimensional axis placement (IfcAxis2Placement3D). The axis placement may have to be calculated. Informal proposition - No two or more elements (subtypes of IfcProduct) shall share the same instance of IfcObjectPlacement.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcobjectplacement.htm"
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|
},
|
|
"IfcObjective": {
|
|
"attributes": {
|
|
"BenchmarkValues": "A list of any benchmark values used for comparison purposes.",
|
|
"ObjectiveQualifier": "Enumeration that qualifies the type of objective constraint.",
|
|
"ResultValues": "A list of any resultant values used for comparison purposes.",
|
|
"UserDefinedQualifier": "A user defined value that qualifies the type of objective constraint when ObjectiveQualifier attribute of type _IfcObjectiveEnum_ has value USERDEFINED."
|
|
},
|
|
"description": "An IfcObjective captures qualitative information for an objective-based constraint. IfcObjective is a subtype of IfcConstraint and may be associated with any subtype of IfcObject through the IfcRelAssociatesConstraint relationship in the IfcControlExtension schema. The aim of IfcObjective is to specify the purpose for which the constraint is applied and to capture the values of the constraint. These may be both the benchmark values that are intended to indicate the constraint extent and the resulting values in use that enable performance comparisons to be applied.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstraintresource/lexical/ifcobjective.htm"
|
|
},
|
|
"IfcOccupant": {
|
|
"description": "An_IfcOccupant_ is a type of actor that defines the form of occupancy of a property. The principal purpose of IfcOccupant is to determine the nature of occupancy of a property for a particular actor. All characteristics relating to the actor (name, organization details etc.) are inherited from the IfcActor class. The property to be occupied is defined by IfcSpatialStructureElement and the assignment of the occupant to the property is via the IfcRelOccupiesSpaces relationship class. Particular details of the agreement relating to the occupancy of a property are dealt with in the Pset_PropertyAgreement that is defined for the instance of IfcSpatialStructureElement. This means that an occupant may be related to a site, building, building storey or space or to any composition of site, building, building storey or space through the IfcSpatialStructureElement.ElementComposition. For instance, if the property concerned is several office spaces on a building storey, it might be appropriate to reference IfcBuildingStorey.ElementComposition=PARTIAL. Occupants of a property may be considered to be the parties to an agreement. The roles that the occupant may play in respect to an agreement are defined in the IfcOccupantTypeEnum. If the role is not specified by the predefined contents of this enumeration, the value USERDEFINED may be set and the IfcOccupant.UserDefinedOccupant attribute asserted.",
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|
"predefined_types": {
|
|
"ASSIGNEE": "Actor receiving the assignment of a property agreement from an assignor.",
|
|
"ASSIGNOR": "Actor assigning a property agreement to an assignor.",
|
|
"LESSEE": "Actor receiving the lease of a property from a lessor.",
|
|
"LESSOR": "Actor leasing a property to a lessee.",
|
|
"LETTINGAGENT": "Actor participating in a property agreement on behalf of an owner, lessor or assignor.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"OWNER": "Actor that owns a property.",
|
|
"TENANT": "Actor renting the use of a property fro a period of time.",
|
|
"USERDEFINED": "User-defined type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedfacilitieselements/lexical/ifcoccupant.htm"
|
|
},
|
|
"IfcOffsetCurve2D": {
|
|
"attributes": {
|
|
"BasisCurve": "The curve that is being offset.",
|
|
"Distance": "The distance of the offset curve from the basis curve. distance may be positive, negative or zero. A positive value of distance defines an offset in the direction which is normal to the curve in the sense of an anti-clockwise rotation through 90 degrees from the tangent vector T at the given point. (This is in the direction of orthogonal complement(T).)",
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|
"SelfIntersect": "An indication of whether the offset curve self-intersects; this is for information only."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: An offset curve 2d (IfcOffsetCurve2d) is a curve at a constant distance from a basis curve in two-dimensional space. This entity defines a simple plane-offset curve by offsetting by distance along the normal to basis curve in the plane of basis curve. The underlying curve shall have a well-defined tangent direction at every point. In the case of a composite curve, the transition code between each segment shall be cont same gradient or cont same gradient same curvature. The offset curve 2d takes its parameterization from the basis curve. The offset curve 2d is parameterized as where T is the unit tangent vector to the basis curve C(u) at parameter value u, and d is distance. The underlying curve shall be two-dimensional.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcoffsetcurve2d.htm"
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|
},
|
|
"IfcOffsetCurve3D": {
|
|
"attributes": {
|
|
"BasisCurve": "The curve that is being offset.",
|
|
"Distance": "The distance of the offset curve from the basis curve. The distance may be positive, negative or zero.",
|
|
"RefDirection": "The direction used to define the direction of the offset curve 3d from the basis curve.",
|
|
"SelfIntersect": "An indication of whether the offset curve self-intersects, this is for information only."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: An offset curve 3d is a curve at a constant distance from a basis curve in three-dimensional space. The underlying curve shall have a well-defined tangent direction at every point. In the case of a composite curve the transition code between each segment shall be cont same gradient or cont same gradient same curvature. The offset curve at any point (parameter) on the basis curve is in the direction V x T where V is the fixed reference direction and T is the unit tangent to the basis curve. For the offset direction to be well defined, T shall not at any point of the curve be in the same, or opposite, direction as V. The offset curve 3d takes its parameterization from the basis curve. The offset curve 3d is parameterized as where T is the unit tangent vector to the basis curve C(u) at parameter value u, and d is distance. The underlying curve shall be three-dimensional. Informal propositions: - At no point on the curve shall ref direction be parallel, or opposite to, the direction of the tangent vector.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcoffsetcurve3d.htm"
|
|
},
|
|
"IfcOneDirectionRepeatFactor": {
|
|
"attributes": {
|
|
"RepeatFactor": "A vector which specifies the relative positioning of hatch lines."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: A one time repeat factor is a vector used in the fill area style hatching and fill area style tiles entities for determining the origin of the repeated hatch line relative to the origin of the previous hatch line, Given the initial position of any hatch line, the one direction repeat factor determines two new positions according to the equation:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifconedirectionrepeatfactor.htm"
|
|
},
|
|
"IfcOpenShell": {
|
|
"description": "Definition from ISO/CD 10303-42:1992: An open shell is a shell of the dimensionality 2. Its domain, if present, is a finite, connected, oriented, 2-manifold with boundary, but is not a closed surface. It can be thought of as a closed shell with one or more holes punched in it. The domain of an open shell satisfies 0 < \u039e < 1. An open shell is functionally more general than a face because its domain can have handles. The shell is defined by a collection of faces, which may be oriented faces. The sense of each face, after taking account of the orientation, shall agree with the shell normal as defined below. The orientation can be supplied directly as a BOOLEAN attribute of an oriented face, or be defaulted to TRUE if the shell member is a face without the orientation attribute. The following combinatorial restrictions on open shells and geometrical restrictions on their domains are designed, together with the informal propositions, to ensure that any domain associated with an open shell is an orientable manifold. - Each face reference shall be unique. - An open shell shall have at least one face. - A given face may exist in more than one open shell. The boundary of an open shell consists of the edges that are referenced only once by the face - bounds (loops) of its faces, together with all of their vertices. The domain of an open shell, if present, contains all edges and vertices of its faces. In the current IFC Release only poly loops (IfcPolyLoop) are defined for bounds of face bound (IfcFaceBound.Bound). This will allow for faceted B-rep only. For further specification, including the Euler formulas to be satisfied, please refer to ISO 10303-42:1994. Informal propositions: - Every edge shall be referenced exactly twice by the face bounds of the face. - Each oriented edge shall be unique. - No edge shall be referenced by more than two faces. - Distinct faces of the shell do not intersect, but may share edges or vertices. - Distinct edges do not intersect but may share vertices. - Each face reference shall be unique. - The loops of the shell shall not be a mixture of poly loop and other loop types. Note: this is given, since only poly loop is defined as face bound definition. - The closed shell shall be an oriented arcwise connected 2-manifold. - The Euler equation shall be satisfied. Note: Please refer to ISO/IS 10303-42:1994, p.148 for the equation.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcopenshell.htm"
|
|
},
|
|
"IfcOpeningElement": {
|
|
"attributes": {
|
|
"HasFillings": "Reference to the Filling Relationship that is used to assign Elements as Fillings for this Opening Element. The Opening Element can be filled with zero-to-many Elements."
|
|
},
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"description": "The opening element stands for opening, recess or chase, all reflecting voids. It represents a void within any element that has physical manifestation. Openings must be handled by all sectors and disciplines in AEC/FM industry, therefore the interoperability for opening elements is provided at this high level. There are two different types of opening elements: - an opening, where the thickness of the opening is greater or equal to the thickness of the element; - a recess or niche, where the thickness of the recess is smaller than the thickness of the element. The inherited attribute ObjectType should be used to capture the differences, - the attribute is set to 'Opening' for an opening or - the attribute is set to 'Recess' for a recess or niche. - If the value for ObjectType is omitted, opening is assumed. An IfcOpeningElement has to be inserted into a building element (all subtypes of IfcBuildingElement) by using the IfcRelVoidsElement relationship. ~~It is also directly linked to the spatial structure of the project (and here normally to the IfcBuildingStorey) by using the IfcRelContainedInSpatialStructure relationship~~. It should not be linked directly to the spatial structure of the project, i.e. the inverse relationship ContainedInStructure shall be NIL. It is assigned to the spatial structure through the elements it penetrates. *Property Set Use Definition*: The property sets relating to the IfcOpeningElement are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcOpeningElement are part of this IFC release: - Pset_OpeningElementCommon: common property set for all opening occurrences *Quantity Use Definition*: The quantities relating to the IfcOpeningElement are defined by the IfcElementQuantity and attached by the IfcRelDefinesByProperties. The following quantities are foreseen, but will be subjected to the local standard of measurement: *Geometry Use Definitions* The geometric representation of IfcOpeningElement is given by the IfcProductDefinitionShape and IfcLocalPlacement allowing multiple geometric representations. Local Placement The local placement for IfcOpeningElement is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement should point to the local placement of the same element, which is voided by the opening, i.e. referred to by VoidsElement.RelatingBuildingElement. Geometric Representation Currently, the use of 'SweptSolid', 'Brep', and 'MappedRepresentation' representation is supported. Swept Solid Representation with Horizontal Extrusion The 'SweptSolid' geometric representation of IfcOpeningElement, using horizontal extrusion direction (for walls), is defined using the swept area solid geometry. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'SweptSolid' The following additional constraints apply to the swept solid representation: - Solid: IfcExtrudedAreaSolid is required, the set of IfcShapeRepresentation.Items may include a single, or multiple, instances of IfcExtrudedAreaSolid. - Profile: IfcRectangleProfileDef, IfcCircleProfileDef and IfcArbitraryClosedProfileDef shall be supported. - Extrusion: The profile shall be extruded horizontally (i.e. perpendicular to the extrusion direction of the voided element), e.g. for wall openings, or vertically (i.e. in the extrusion direction of the voided element), e.g., for floor openings. If multiple instances of IfcExtrudedAreaSolid are used, the extrusion direction should be equal. Special agreement for defining openings in round building elements, e.g., in round walls. The opening width, in case of a rectangular opening equal with the IfcRectangleProfileDef.XDim, is defined as the straight line distance between two parallel jambs. If the jambs are defined radial (to the center of the arc used to define the round wall) then the opening width is defined to be the outer arc length. EXAMPLE for openings EXAMPLE for recesses Swept Solid Representation with Vertical Extrusion The 'SweptSolid' geometric representation of IfcOpeningElement, using vertical extrusion direction (for walls), is defined using the swept area solid geometry, however the extrusion direction may be vertical, i.e. in case of a wall opening, the extrusion would be in the direction of the wall height. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'SweptSolid' The following additional constraints apply to the swept solid representation: - Solid: IfcExtrudedAreaSolid is required, the set of IfcShapeRepresentation.Items may include a single, or multiple, instances of IfcExtrudedAreaSolid. - Profile: IfcRectangleProfileDef, IfcCircleProfileDef and IfcArbitraryClosedProfileDef shall be supported. - Extrusion: The profile shall be extruded vertically, i.e. for wall openings along the extrusion direction of the voided element. If multiple instances of IfcExtrudedAreaSolid are used, the extrusion direction should be equal. Vertical extrusions shall be used when an opening or recess has a non rectangular foot print geometry that does not change along the height of the opening or recess. Brep Representation The general b-rep geometric representation of IfcOpeningElement is defined using the Brep geometry. The Brep representation allows for the representation of complex element shape. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'Brep'",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcopeningelement.htm"
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},
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"IfcOpticalMaterialProperties": {
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"attributes": {
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"SolarReflectanceBack": "Reflectance at normal incidence (solar): back side. Defines the fraction of the solar ray that is reflected and not transmitted when the ray passes from one medium into another, at the \"back\" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.",
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"SolarReflectanceFront": "Reflectance at normal incidence (solar): front side. Defines the fraction of the solar ray that is reflected and not transmitted when the ray passes from one medium into another, at the \"front\" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.",
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"SolarTransmittance": "Transmittance at normal incidence (solar). Defines the fraction of solar radiation that passes through per unit area, perpendicular to the surface.",
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"ThermalIrEmissivityBack": "Thermal IR emissivity: back side. Defines the fraction of thermal energy emitted per unit area to \"blackbody\" at the same temperature, through the \"back\" side of the material.",
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"ThermalIrEmissivityFront": "Thermal IR emissivity: front side. Defines the fraction of thermal energy emitted per unit area to \"blackbody\" at the same temperature, through the \"front\" side of the material.",
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"ThermalIrTransmittance": "Thermal IR transmittance at normal incidence. Defines the fraction of thermal energy that passes through per unit area, perpendicular to the surface.",
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"VisibleReflectanceBack": "Reflectance at normal incidence (visible): back side. Defines the fraction of the solar ray in the visible spectrum that is reflected and not transmitted when the ray passes from one medium into another, at the \"back\" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.",
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"VisibleReflectanceFront": "Reflectance at normal incidence (visible): front side. Defines the fraction of the solar ray in the visible spectrum that is reflected and not transmitted when the ray passes from one medium into another, at the \"front\" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.",
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"VisibleTransmittance": "Transmittance at normal incidence (visible). Defines the fraction of the visible spectrum of solar radiation that passes through per unit area, perpendicular to the surface."
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},
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"description": "A container class with material optical properties defined in IFC specification.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcopticalmaterialproperties.htm"
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},
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"IfcOrderAction": {
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"attributes": {
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"ActionID": "A unique identifier assigned to an action on issue."
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},
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"description": "An IfcOrderAction is the point at which requests for work are received and processed within an organization. The IfcOrderAction represents tasks that might be carried out by a Helpdesk acting the role of interface for the organization between the facility user and the functional requirement of fulfilling their needs. The actual task represented by the IfcOrderAction class is turning a request into an order and initiating the action that will enable the order to be completed. IfcRelAssignsToControl is used to relate one or more instances of IfcOrderAction to an IfcProjectOrder or one of its subtypes including maintenance work order.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcorderaction.htm"
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},
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"IfcOrganization": {
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"attributes": {
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"Addresses": "Postal and telecom addresses of an organization. > NOTE: There may be several addresses related to an organization.",
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"Description": "Text that relates the nature of the organization.",
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"Engages": "Inverse relationship to IfcPersonAndOrganization relationships in which IfcOrganization is engaged.",
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"Id": "Identification of the organization.",
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"IsRelatedBy": "The inverse relationship for relationship RelatedOrganizations of IfcOrganizationRelationship.",
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"Name": "The word, or group of words, by which the organization is referred to.",
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"Relates": "The inverse relationship for relationship RelatingOrganization of IfcOrganizationRelationship.",
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"Roles": "Roles played by the organization."
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},
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"description": "A named and structured grouping with a corporate identity.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcorganization.htm"
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},
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"IfcOrganizationRelationship": {
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"attributes": {
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"Description": "Text that relates the nature of the relationship.",
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"Name": "The word or group of words by which the relationship is referred to.",
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"RelatedOrganizations": "The other, possibly dependent, organizations which are the related parts of the relationship between organizations.",
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"RelatingOrganization": "Organization which is the relating part of the relationship between organizations."
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},
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"description": "IfcOrganizationRelationship establishes an association between one relating organization, and one or more related organizations.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcorganizationrelationship.htm"
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},
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"IfcOrientedEdge": {
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"attributes": {
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"EdgeElement": "Edge entity used to construct this oriented edge.",
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"EdgeEnd": "The end vertex of the oriented edge. It derives from the vertices of the edge element after taking account of the orientation. IfcBooleanChoose (Orientation, EdgeElement.EdgeEnd, EdgeElement.EdgeStart)",
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"EdgeStart": "The start vertex of the oriented edge. It derives from the vertices of the edge element after taking account of the orientation. IfcBooleanChoose (Orientation, EdgeElement.EdgeStart, EdgeElement.EdgeEnd)",
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"Orientation": "BOOLEAN, If TRUE the topological orientation as used coincides with the orientation from start vertex to end vertex of the edge element. If FALSE otherwise."
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},
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"description": "Definition from ISO/CD 10303-42:1992: An oriented edge is an edge constructed from another edge and contains a BOOLEAN direction flag to indicate whether or not the orientation of the constructed edge agrees with the orientation of the original edge. Except for perhaps orientation, the oriented edge is equivalent to the original edge.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcorientededge.htm"
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},
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"IfcOutletType": {
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"description": "An IfcOutletType defines a particular type of outlet which is a device installed at a point to receive an inserted plug. *Use Definitions* An IfcOutletType provides for all forms of outlet. Usage of IfcOutletType defines the parameters for one or more occurrences of IfcFlowTerminal. Parameters are specified through property sets that are enumerated in the IfcOutletTypeEnum data type. *Property Set Use Definition*: The property sets relating to the IfcProtectiveDeviceType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcProtectiveDeviceType are part of this IFC release: - Pset_ElectricalDeviceCommon: property set for properties that are common to all types of electrical devices, if available - Pset_OutletTypeCommon: property set for properties that are common to all types of cabled outlet, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
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"predefined_types": {
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"AUDIOVISUALOUTLET": "An outlet used for an audio or visual device.",
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"COMMUNICATIONSOUTLET": "An outlet used for connecting communications equipment.",
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"NOTDEFINED": "Undefined type.<",
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"POWEROUTLET": "An outlet used for connecting electrical devices requiring power.",
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"USERDEFINED": "User-defined type."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcoutlettype.htm"
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},
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"IfcOwnerHistory": {
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"attributes": {
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"ChangeAction": "Enumeration that defines the actions associated with changes made to the object.",
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"CreationDate": "Time and date of creation.",
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"LastModifiedDate": "Date and Time at which the last modification occurred.",
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"LastModifyingApplication": "Application used to carry out the last modification.",
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"LastModifyingUser": "User who carried out the last modification.",
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"OwningApplication": "Direct reference to the application which currently \"Owns\" this object on behalf of the owning user, who uses this application. Note that IFC includes the concept of ownership transfer from one app to another and therefore distinguishes between the Owning Application and Creating Application.",
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"OwningUser": "Direct reference to the end user who currently \"owns\" this object. Note that IFC includes the concept of ownership transfer from one user to another and therefore distinguishes between the Owning User and Creating User.",
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"State": "Enumeration that defines the current access state of the object."
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},
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"description": "IfcOwnerHistory defines all history and identification related information. In order to provide fast access it is directly attached to all independent objects, relationships and properties. IfcOwnerHistory is used to identify the creating and owning application and user for the associated object, as well as capture the last modifying application and user.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcutilityresource/lexical/ifcownerhistory.htm"
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},
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"IfcParameterizedProfileDef": {
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"attributes": {
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"Position": "Position coordinate system of the parameterized profile definition."
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},
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"description": "The parameterized profile definition defines a 2D position coordinate system to which the parameters of the different profiles relate to. All profiles are defined centric to the origin of the position coordinate system, or more specific, the origin [0.,0.] shall be in the center of the bounding box ~~gravity~~ of the profile. The Position attribute of the IfcParameterizedProfileDef is used to position the profile within the XY plane of the underlying coordinate system of the swept surface geometry, the swept area solid or the sectioned spine. It can be used to position the profile at any cardinal point that becomes the origin [0.,0.,0.] of the extruded or rotated surface or solid.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcparameterizedprofiledef.htm"
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},
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"IfcPath": {
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"attributes": {
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"EdgeList": "The list of oriented edges which are concatenated together to form this path."
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},
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"description": "Definition from ISO/CD 10303-42:1992: A path is a topological entity consisting of an ordered collection of oriented edges, such that the edge start vertex of each edge coincides with the edge end of its predecessor. The path is ordered from the edge start of the first oriented edge to the edge end of the last edge. The BOOLEAN value sense in the oriented edge indicates whether the edge direction agrees with the direction of the path (TRUE) or is the opposite direction (FALSE). An individual edge can only be referenced once by an individual path. An edge can be referenced by multiple paths. An edge can exist independently of a path. Informal proposition: - A path has dimensionality 1. - A path is arcwise connected. - The edges of the path do not intersect except at common vertices. - A path has a finite, non-zero extent.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcpath.htm"
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},
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"IfcPerformanceHistory": {
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"attributes": {
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"LifeCyclePhase": "Describes the applicable building life-cycle phase. Typical values should be DESIGNDEVELOPMENT, SCHEMATICDEVELOPMENT, CONSTRUCTIONDOCUMENT, CONSTRUCTION, ASBUILT, COMMISSIONING, OPERATION, etc."
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},
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"description": "The IfcPerformanceHistory is used to document the actual performance of an occurrence instance over time. In practice, performance-related data are generally not easy to obtain as they can originate from different sources (e.g. predicted, simulated, or measured) and occur during different stages of the building life-cycle. Such time-related data cover a large spectrum, including meteorological data, schedules, operational status measurements, trend reports, etc.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccontrolextension/lexical/ifcperformancehistory.htm"
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},
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"IfcPermeableCoveringProperties": {
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"attributes": {
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"FrameDepth": "Depth of panel frame (used to include the permeable covering), measured from front face to back face horizontally (i.e. perpendicular to the window or door (elevation) plane.",
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"FrameThickness": "Width of panel frame (used to include the permeable covering), measured from inside of panel (at permeable covering) to outside of panel (at lining), i.e. parallel to the window or door (elevation) plane.",
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"OperationType": "Types of permeable covering operations. Also used to assign standard symbolic presentations according to national building standards.",
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"PanelPosition": "Position of this permeable covering panel within the overall window or door type.",
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"ShapeAspectStyle": "Optional link to a shape aspect definition, which points to the part of the geometric representation of the window style, which is used to represent the permeable covering."
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},
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"description": "Definition from BS 6100: A permeable covering is a permeable cover for an opening which allows airflow . A description of a panel within a door or window (as fillers for opening) which allows for air flow. It is given by its properties (IfcPermeableCoveringProperties). A permeable covering is a casement, i.e. a component, fixed or opening, consisting essentially of a frame and the infilling. The infilling is normally a grill, a louver or a screen. The way of operation is defined in the operation type. The IfcPermeableCoveringProperties are included in the list of properties (HasPropertySets) of the IfcWindowStyle or the IfcDoorStyle. More information about the permeable covering can be included in the same list of the window or door style using the IfcPropertySet for dynamic extensions. This particularly applies for additional properties for the various operation types *Geometry Use Definitions* The IfcPermeableCoveringProperties does not hold an own geometric representation. However it defines parameter, which can be used to create the shape of the IfcWindowStyle (which is inserted by the IfcWindow into the spatial context of the project), or of the IfcDoorStyle (which is inserted by the IfcDoor). Interpretation of parameter The parameters at the IfcPermeableCoveringProperties define a standard permeable covering. The outer boundary of the panel is determined by the occurrence parameter assigned to the IfcWindow or IfcDoor. It has to take the lining parameter into account as well. The position of the permeable covering within the overall window or door is determined by the PanelPosition attribute.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcarchitecturedomain/lexical/ifcpermeablecoveringproperties.htm"
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},
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"IfcPermit": {
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"attributes": {
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"PermitID": "A unique identifier assigned to a permit."
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},
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"description": "An IfcPermit is a document that allows permission to carry out actions in places and on artifacts where security or other access restrictions apply. *Use Definitions* The permit will identify the restrictions that apply and when access may be gained to carry out the actions. IfcRelAssignsToControl is used to identify related spaces, assets etc. upon which actions are permitted to take place. *Property Set Use Definition*: The property sets relating to an IfcPermit are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcPermit are part of this IFC release: - Pset_Permit: property set for the properties of a permit to do work or carry out an action, if available",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcpermit.htm"
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},
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"IfcPerson": {
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"attributes": {
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"Addresses": "Postal and telecommunication addresses of a person. > NOTE - A person may have several addresses.",
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"EngagedIn": "The inverse relationship to IfcPersonAndOrganization relationships in which IfcPerson is engaged.",
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"FamilyName": "The name by which the family identity of the person may be recognized. > NOTE: Depending on geographical location and culture, family name may appear either as the first or last component of a name.",
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"GivenName": "The name by which a person is known within a family and by which he or she may be familiarly recognized. > NOTE: Depending on geographical location and culture, given name may appear either as the first or last component of a name.",
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"Id": "Identification of the person.",
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"MiddleNames": "Additional names given to a person that enable their identification apart from others who may have the same or similar family and given names. > NOTE: Middle names are not normally used in familiar communication but may be asserted to provide additional identification of a particular person if necessary. They may be particularly useful in situations where the person concerned has a family name that occurs commonly in the geographical region.",
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"PrefixTitles": "The word, or group of words, which specify the person's social and/or professional standing and appear before his/her names.",
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"Roles": "Roles played by the person.",
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"SuffixTitles": "The word, or group of words, which specify the person's social and/or professional standing and appear after his/her names."
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|
},
|
|
"description": "Definition from ISO/CD 10303-41:1992: An individual human being.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcperson.htm"
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},
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"IfcPersonAndOrganization": {
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"attributes": {
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"Roles": "Roles played by the person within the context of an organization.",
|
|
"TheOrganization": "The organization to which the person is related.",
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"ThePerson": "The person who is related to the organization."
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},
|
|
"description": "Identification of a person within an organization.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcpersonandorganization.htm"
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},
|
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"IfcPhysicalComplexQuantity": {
|
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"attributes": {
|
|
"Discrimination": "Identification of the discrimination by which this physical complex property is distinguished. Examples of discriminations are 'layer', 'steel bar diameter', etc.",
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"HasQuantities": "Set of physical quantities that are grouped by this complex physical quantity according to a given discrimination.",
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"Quality": "Additional indication of a quality of the quantities that are grouped under this physical complex quantity.",
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"Usage": "Additional indication of a usage type of the quantities that are grouped under this physical complex quantity."
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},
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"description": "The complex physical quantity, IfcPhysicalComplexQuantity, is an entity that holds a set of single quantity measure value (as defined at the subtypes of IfcPhysicalSimpleQuantity), that all apply to a given component or aspect of the element. A section \"Quantity Use Definition\" at individual entities as subtypes of IfcBuildingElement gives guidance to the usage of the Name and Discrimination attribute to characterize the complex quantities.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcphysicalcomplexquantity.htm"
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},
|
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"IfcPhysicalQuantity": {
|
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"attributes": {
|
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"Description": "Further explanation that might be given to the quantity.",
|
|
"Name": "Name of the element quantity or measure. The name attribute has to be made recognizable by further agreements.",
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"PartOfComplex": "Reference to a physical complex quantity in which the physical quantity may be contained."
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},
|
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"description": "The physical quantity, IfcPhysicalQuantity, is an abstract entity that holds a complex or simple quantity measure together with a semantic definition of the usage for the single or several measure value. The Name attribute defines the actual usage or kind of measure. The interpretation of the name label has to be established within the actual exchange context. In addition an informative text may be associated to each quantity by the Description attribute.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcphysicalquantity.htm"
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},
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"IfcPhysicalSimpleQuantity": {
|
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"attributes": {
|
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"Unit": "Optional assignment of a unit. If no unit is given, then the global unit assignment, as established at the IfcProject, applies to the quantity measures."
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},
|
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"description": "The physical quantity, IfcPhysicalSimpleQuantity, is an entity that holds a single quantity measure value (as defined at the subtypes of IfcPhysicalSimpleQuantity) together with a semantic definition of the usage for the measure value. A section \"Quantity Use Definition\" at individual entities as subtypes of IfcBuildingElement gives guidance to the usage of the Name attribute to characterize the individual quantities. If the Unit attribute is given, the value attribute (introduced at the level of subtypes of IfcPhysicalSimpleQuantity) are given as quantities of this unit, otherwise the global unit definitions (given by IfcUnitAssignment) are used.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcphysicalsimplequantity.htm"
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},
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"IfcPile": {
|
|
"attributes": {
|
|
"ConstructionType": "General designator for how the pile is constructed."
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},
|
|
"description": "A slender timber, concrete, or steel structural element, driven, jetted, or otherwise embedded on end in the ground for the purpose of supporting a load. Geometry Use Definitions: The geometric representation of IfcPile is given by the IfcProductDefinitionShape, allowing multiple geometric representation. Included are: Local Placement The local placement for IfcPile is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Standard Geometric Representation using Swept Solid Representation The standard geometric representation of IfcPile is defined using the swept solid representation. The RepresentationType attribute of IfcShapeRepresentation should have the value 'SweptSolid'. The following constraints apply to the standard representation: - Solid: IfcExtrudedAreaSolid shall be supported - Profile: IfcRectangleProfileDef and IfcCircleProfileDef shall be supported - Extrusion: The profile shall be extruded vertically, i.e., in the direction of the z-axis of the co-ordinate system of the referred spatial structure element. It might be further constraint to be in the direction of the global z-axis in implementers agreements. The extrusion axis shall be perpendicular to the swept profile, i.e. pointing into the direction of the z-axis of the Position of the IfcExtrudedAreaSolid. Advanced Geometric Representation using CSG Representation The advanced geometric representation of IfcPile is defined using the Swept Solid or CSG representation. The RepresentationType attribute of IfcShapeRepresentation should have the value 'SweptSolid' or 'CSG'. The following additional constraints apply to the advanced representation: - Solid: see standard geometric representation, - Profile: IfcRectangleProfileDef, IfcCircleProfileDef, IfcIShapeProfileDef and IfcArbitraryProfileDef shall be supported. - Extrusion: All extrusion directions shall be supported - Boolean result: The IfcBooleanClippingResult shall be supported, allowing for Boolean differences between the swept solid (here IfcExtrudedAreaSolid) and one or several IfcHalfSpaceSolid.",
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|
"predefined_types": {
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|
"COHESION": "A cohesion pile.",
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|
"FRICTION": "A friction pile.",
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|
"NOTDEFINED": "The type of pile function is not defined.",
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|
"SUPPORT": "A support pile.",
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|
"USERDEFINED": "The type of pile function is user defined."
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|
},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifcpile.htm"
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|
},
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|
"IfcPipeFittingType": {
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|
"description": "The element type IfcPipeFittingType defines a list of commonly shared property set definitions of a pipe fitting and an optional set of product representations. It is used to define a pipe fitting specification (i.e. the specific product information, that is common to all occurrences of that product type). A pipe fitting type is used to define the common properties of a Pipe fitting that may be applied to many occurrences of that type. A pipe fitting is a junction or transition in a flow distribution system (e.g., elbow, tee, etc.). Pipe fitting types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcPipeFittingType are represented by instances of IfcFlowFitting or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_PipeFittingTypeCommon: common property set for all pipe fitting types",
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|
"predefined_types": {
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|
"BEND": "A fitting with typically two ports used to change the direction of flow between connected elements.",
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|
"CONNECTOR": "Connector fitting, typically used to join two ports together within a flow distribution system (e.g., a coupling used to join two pipe segments).",
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|
"ENTRY": "Entry fitting, typically unconnected at one port and connected to a flow distribution system at the other (e.g., a breeching inlet).",
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|
"EXIT": "Exit fitting, typically unconnected at one port and connected to a flow distribution system at the other (e.g., a hose bibb).",
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|
"JUNCTION": "A fitting with typically more than two ports used to redistribute flow among the ports and/or to change the direction of flow between connected elements (e.g, tee, cross, wye, etc.).",
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|
"NOTDEFINED": "Undefined fitting.",
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|
"OBSTRUCTION": "A fitting with typically two ports used to obstruct or restrict flow between the connected elements (e.g., screen, perforated plate, etc.).",
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|
"TRANSITION": "A fitting with typically two ports having different shapes or sizes. Can also be used to change the direction of flow between connected elements.",
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|
"USERDEFINED": "User-defined fitting."
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|
},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcpipefittingtype.htm"
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|
},
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|
"IfcPipeSegmentType": {
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|
"description": "The element type IfcPipeSegmentType defines a list of commonly shared property set definitions of a pipe segment and an optional set of product representations. It is used to define a pipe segment specification (i.e. the specific product information, that is common to all occurrences of that product type). A pipe segment type is used to define the common properties of a pipe segment that may be applied to many occurrences of that type. A pipe segment is used to typically join two sections of a piping network. Pipe segment types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcPipeSegmentType are represented by instances of IfcFlowSegment or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_PipeSegmentTypeCommon: common property set for all pipe segment types Pset_PipeSegmentTypeGutter: property set for all gutter segment types",
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|
"predefined_types": {
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|
"FLEXIBLESEGMENT": "A flexible segment is a continuous non-linear segment of pipe that can be deformed and change the direction of flow.",
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|
"GUTTER": "A gutter segment is a continuous open-channel segment of pipe.",
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|
"NOTDEFINED": "Undefined segment.",
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|
"RIGIDSEGMENT": "A rigid segment is continuous linear segment of pipe that cannot be deformed.",
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|
"SPOOL": "A type of rigid segment that is typically shorter and used for providing connectivity within a piping network.",
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|
"USERDEFINED": "User-defined segment."
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|
},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcpipesegmenttype.htm"
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|
},
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|
"IfcPixelTexture": {
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|
"attributes": {
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|
"ColourComponents": "Indication whether the pixel values contain a 1, 2, 3, or 4 colour component.",
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|
"Height": "The number of pixels in height (T) direction.",
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|
"Pixel": "Flat list of hexadecimal values, each describing one pixel by 1, 2, 3, or 4 components.",
|
|
"Width": "The number of pixels in width (S) direction."
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|
},
|
|
"description": "Definition from IAI: An IfcPixelTexture provides a 2D image-based texture map as an explicit array of pixel values (image field). In contrary to the IfcImageTexture the IfcPixelTexture holds a 2 dimensional list of pixel color (and opacity) directly, instead of referencing to an URL. The following additional definitions from ISO/IEC FCD 19775:200x, the Extensible 3D (X3D) specification, apply: The following general recommendations for explicit image array format support from ISO/IEC FCD 19775:200x, the Extensible 3D (X3D) specification, also apply: Note that alpha equals (1.0 -transparency), if alpha and transparency each range from 0.0 to 1.0.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcpixeltexture.htm"
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|
},
|
|
"IfcPlacement": {
|
|
"attributes": {
|
|
"Dim": "The space dimensionality of this class, derived from the dimensionality of the location. Location.Dim",
|
|
"Location": "The geometric position of a reference point, such as the center of a circle, of the item to be located."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A placement entity defines the local environment for the definition of a geometry item. It locates the item to be defined and, in the case of the axis placement subtypes, gives its orientation. Additional definition from ISO/WD SC4/WG12/N071 Part42.2 geometry_schema: A placement locates a geometric item with respect to the coordinate system of its geometric context. The IfcPlacement is an abstract supertype not to be directly instantiated, whereas the STEP P42 entity placement can be instantiated to define a placement without orientation. The derived attribute Dim has been added, see also note at IfcGeometricRepresentationItem.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcplacement.htm"
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|
},
|
|
"IfcPlanarBox": {
|
|
"attributes": {
|
|
"Placement": "The _IfcAxis2Placement_ positions a local coordinate system for the definition of the rectangle. The origin of this local coordinate system serves as the lower left corner of the rectangular box. > NOTE In case of a 3D placement by IfcAxisPlacement3D the IfcPlanarBox is defined within the xy plane of the definition coordinate system."
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|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: A planar box specifies an arbitrary rectangular box and its location in a two dimensional Cartesian coordinate system.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifcplanarbox.htm"
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|
},
|
|
"IfcPlanarExtent": {
|
|
"attributes": {
|
|
"SizeInX": "The extent in the direction of the x-axis.",
|
|
"SizeInY": "The extent in the direction of the y-axis."
|
|
},
|
|
"description": "The planar extent defines the extent along the two axes of the two-dimensional coordinate system, independently of its position.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifcplanarextent.htm"
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|
},
|
|
"IfcPlane": {
|
|
"description": "Definition from ISO/CD 10303-42:1992: A plane is an unbounded surface with a constant normal. A plane is defined by a point on the plane and the normal direction to the plane. The data is to be interpreted as follows: In the above parameterization the length unit for the unit vectors x and y is derived from the context of the plane.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcplane.htm"
|
|
},
|
|
"IfcPlate": {
|
|
"description": "An IfcPlate is a planar and often flat part with constant thickness. A plate can be a structural part carrying loads between or beyond points of support, however it is not required to be load bearing. The location of the plate (being horizontal, vertical or sloped) is not relevant to its definition (in contrary to IfcWall and IfcSlab (as floor slab)). ",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcplate.htm"
|
|
},
|
|
"IfcPlateType": {
|
|
"description": "The element type IfcPlateType defines a list of commonly shared property set definitions of a thin planar element and an optional set of product representations (i.e. the specific product information, that is common to all occurrences of that product type). A plate type is used to define the common properties of a certain type of a plate that may be applied to many instances of that type to assign a specific style. Plate types may be exchanged without being already assigned to occurrences. It is used to define a planar, or plate-like parts to be located by one or several instances of IfcPlate. The occurrences of the IfcPlateType are represented by instances of IfcPlate. Use definition for steel members When using the IfcPlateType as underlying type for steel members in steel construction applications the following additional conventions apply: Material association: The IfcPlateType is associated with exactly one instance of IfcMaterial by the IfcRelAssociatesMaterial relationship. This material association assigns a common material to all occurrences (IfcPlate) of the IfcPlateType. If an individual occurrence has an own material assignment (see IfcPlate), then that assignment overrides the material assignment given at the IfcPlateType. Geometric representation: The plate type must have a full geometric representation, normally given by IfcExtrudedAreaSolid. Possibly standardized profile names for the plate have no meaning. The IfcPlateType has (at least) one representation map assigned through the RepresentationMaps relation. The representation map has a full geometric representation given by: - Solid: Only IfcExtrudedAreaSolid shall be supported. - Profile: Only _IfcArbitraryClosedProfileDef_shall be supported. The profile represents the contour of the plate. - Extrusion: The extrusion axis shall be perpendicular to the swept profile, i.e. pointing into the direction of the z-axis of the position of the IfcExtrudedAreaSolid. Since the profile instance represents the contour of the plate, the extrusion direction corresponds to the plate thickness. Position number: The position number is specified in the attribute IfcTypeProduct.Tag. Non geometric profile properties: Non geometric profile properties (for instance mechanical properties) are specified through IfcProfileProperties (and its specific subtypes that are related to the cross section). These properties are attached to IfcPlateType by the relationship IfcRelAssociatesProfileProperties. If an individual occurrence has an own profile property assignment (see IfcPlate), then this assignment overrides the profile property assignment given in IfcPlateType. Quantity related properties: Quantity related properties,which do not relate to the profile, are specified through IfcElementQuantity (and its specific subtypes). These properties are attached to the IfcPlateType by the relationship IfcRelDefinesByProperties. If an individual occurrence has an own element quantity assignment (see IfcPlate), then this assignment overrides the quantity assignment given in IfcPlateType. The following quantities are foreseen, but will be subjected to the local standard of measurement used:",
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|
"predefined_types": {
|
|
"CURTAIN_PANEL": "A planar element within a curtain wall, often consisting of a frame with fixed glazing.",
|
|
"NOTDEFINED": "Undefined linear element.",
|
|
"SHEET": "A planar, flat and thin element, comes usually as metal sheet, and is often used as an additonal part within an assembly.",
|
|
"USERDEFINED": "User-defined linear element."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcplatetype.htm"
|
|
},
|
|
"IfcPoint": {
|
|
"description": "Definition from ISO/CD 10303-42:1992: An point is a location in some real Cartesian coordinate space R^m^, for m = 1, 2 or 3.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcpoint.htm"
|
|
},
|
|
"IfcPointOnCurve": {
|
|
"attributes": {
|
|
"BasisCurve": "The curve to which point parameter relates.",
|
|
"Dim": "The space dimensionality of this class, determined by the space dimensionality of the basis curve. BasisCurve.Dim",
|
|
"PointParameter": "The parameter value of the point location."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A point on curve is a point which lies on a curve. The point is determined by evaluating the curve at a specific parameter value. The coordinate space dimensionality of the point is that of the basis curve. Informal Propositions: - The value of the point parameter shall not be outside the parametric range of the curve.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcpointoncurve.htm"
|
|
},
|
|
"IfcPointOnSurface": {
|
|
"attributes": {
|
|
"BasisSurface": "The surface to which the parameter values relate.",
|
|
"Dim": "The space dimensionality of this class, determined by the space dimensionality of the basis surface. BasisSurface.Dim",
|
|
"PointParameterU": "The first parameter value of the point location.",
|
|
"PointParameterV": "The second parameter value of the point location."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A point on surface is a point which lies on a parametric surface. The point is determined by evaluating the surface at a particular pair of parameter values. Informal Propositions: - The parametric values specified for u and v shall not be outside the parametric range of the basis surface.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcpointonsurface.htm"
|
|
},
|
|
"IfcPolyLoop": {
|
|
"attributes": {
|
|
"Polygon": "List of points defining the loop. There are no repeated points in the list."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A poly loop is a loop with straight edges bounding a planar region in space. A poly loop is a loop of genus 1 where the loop is represented by an ordered coplanar collection of points forming the vertices of the loop. The loop is composed of straight line segments joining a point in the collection to the succeeding point in the collection. The closing segment is from the last to the first point in the collection. The direction of the loop is in the direction of the line segments. A poly loop shall conform to the following topological constraints: The IfcPolyLoop is always closed and the last segment is from the last IfcCartesianPoint in the list of Polygon's to the first IfcCartesianPoint. Therefore the first point shall not be repeated at the end of the list, neither by referencing the same instance, nor by using an additional instance of_IfcCartesianPoint_ having the coordinates as the first point. Informal propositions: - All the points in the polygon defining the poly loop shall be coplanar. - The first and the last Polygon shall be different by value.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcpolyloop.htm"
|
|
},
|
|
"IfcPolygonalBoundedHalfSpace": {
|
|
"attributes": {
|
|
"PolygonalBoundary": "Two-dimensional ~~polyline~~ bounded curve, defined in the xy plane of the position coordinate system.",
|
|
"Position": "Definition of the position coordinate system for the bounding polyline ~~and the base surface~~."
|
|
},
|
|
"description": "The polygonal bounded half space is a special subtype of a half space solid, where the material of the half space used in Boolean expressions is bounded by a polygonal boundary. The base surface of the half space is positioned by its normal relativeto the object coordinate system (as defined at the supertype IfcHalfSpaceSolid), and its polygonal (with or without arc segments) boundary is defined in the XY plane of the position coordinate system established by the Position attribute, the subtraction body is extruded perpendicular to the XY plane of the position coordinate system, i.e. into the direction of the positive Z axis defined by the Position attribute. The boundary is defined by a 2 dimensional polyline (or 2 dimensional composite curve, consisting of straight segments and circular arc segments) within the XY plane of the position coordinate system. The side of the surface which is in the half space is determined by the surface normal and the agreement flag. If the agreement flag is TRUE, then the subset is the one the normal points away from. If the agreement flag is FALSE, then the subset is the one the normal points into. Informal propositions: - The IfcPolyline or the IfcCompositeCurve providing the PolygonalBoundary shall be closed. - If the PolygonalBoundary is given by an IfcCompositeCurve, it shall only have IfcCompositeCurveSegment's of type IfcPolyline, or IfcTrimmedCurve (having a BasisCurve of type IfcLine, or IfcCircle) Illustration:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcpolygonalboundedhalfspace.htm"
|
|
},
|
|
"IfcPolyline": {
|
|
"attributes": {
|
|
"Points": "The points defining the polyline."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: An IfcPolyline is a bounded curve of n -1 linear segments, defined by a list of n points, P1, P2 ... Pn. The curve is parameterized as follows:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcpolyline.htm"
|
|
},
|
|
"IfcPort": {
|
|
"attributes": {
|
|
"ConnectedFrom": "Reference to a port that is connected by the objectified relationship.",
|
|
"ConnectedTo": "Reference to the port connection relationship. The relationship then refers to the other port to which this port is connected.",
|
|
"ContainedIn": "Reference to the element to port connection relationship. The relationship then refers to the element in which this port is contained."
|
|
},
|
|
"description": "An IfcPort provides the means for an element to connect to other elements. An IfcPort is associated with an IfcElement, it belongs to, through the objectified relationship IfcRelConnectsPortToElement. Exactly two ports, belonging to two different elements, are connected with each other through the objectified relationship IfcRelConnectsPorts. An instance of IfcElement may have one or more points at which it connects to other instances of IfcElement. An instance of IfcPort is located at a point where a connection can occur. The location of the port is determined in the context of the local coordinate system of the element to which it belongs. *Containment Use Definitions* As a subordinate part being fully dependent on the master element the IfcPort shall have no independent containment relationship to the spatial structure. *Geometry Use Definition* The geometric representation of IfcPort is given by the IfcProductDefinitionShape, allowing multiple geometric representation. Local Placement The local placement for IfcPort is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point to the local placement of the master IfcElement (its relevant subtypes), which is associated to the IfcPort by the relationship object IfcRelConnectsPortToElement. Shape Representation The geometry use definitions for the shape representation of the IfcPort is given at the level of its subtypes.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcport.htm"
|
|
},
|
|
"IfcPostalAddress": {
|
|
"attributes": {
|
|
"AddressLines": "The postal address. > NOTE: A postal address may occupy several lines (or elements) when recorded. It is expected that normal usage will incorporate relevant elements of the following address concepts: A location within a building (e.g. 3rd Floor) Building name (e.g. Interoperability House) Street number (e.g. 6400) Street name (e.g. Alliance Boulevard). Typical content of address lines may vary in different countries.",
|
|
"Country": "The name of a country.",
|
|
"InternalLocation": "An organization defined address for internal mail delivery.",
|
|
"PostalBox": "An address that is implied by an identifiable mail drop.",
|
|
"PostalCode": "The code that is used by the country's postal service.",
|
|
"Region": "The name of a region. > NOTE: The counties of the United Kingdom and the states of North America are examples of regions.",
|
|
"Town": "The name of a town."
|
|
},
|
|
"description": "The address for delivery of paper based mail.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcpostaladdress.htm"
|
|
},
|
|
"IfcPreDefinedColour": {
|
|
"description": "The pre defined colour determines those qualified names which can be used to identify a colour that is in scope of the current data exchange specification (in contrary to colour specification which defines the colour directly by its colour components).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifcpredefinedcolour.htm"
|
|
},
|
|
"IfcPreDefinedCurveFont": {
|
|
"description": "Definition from ISO/CD 10303-46:1992: The predefined curve font type is an abstract supertype provided to define an application specific curve font. The name label shall be constrained in the application protocol to values that are given specific meaning for curve fonts in that application protocol.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcpredefinedcurvefont.htm"
|
|
},
|
|
"IfcPreDefinedDimensionSymbol": {
|
|
"description": "The pre defined dimension symbol is a pre defined symbol for the purpose to identify a dimension symbol by name. Allowable names are: - 'arc length', - 'conical taper', - 'counterbore', - 'countersink', - 'depth', - 'diameter', - 'plus minus', - 'slope', - 'spherical diameter', - 'spherical radius', - 'square' Illustration from ISO 10303-202, page 203:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcpredefineddimensionsymbol.htm"
|
|
},
|
|
"IfcPreDefinedItem": {
|
|
"attributes": {
|
|
"Name": "The string by which the pre defined item is identified. Allowable values for the string are declared at the level of subtypes."
|
|
},
|
|
"description": "A pre defined item is a qualified name given to a style, font, etc., which is determined within the data exchange specification by convention on using the Name attribute value (in contrary to externally defined items, which are agreed by an external source).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifcpredefineditem.htm"
|
|
},
|
|
"IfcPreDefinedPointMarkerSymbol": {
|
|
"description": "The pre defined point marker symbol is a pre defined symbol for the purpose to identify a point marker by name. Allowable names are: - 'asterisk', - 'circle', - 'dot', - 'plus', - 'square', - 'triangle', - 'x', Illustration from ISO 10303-202, page 210:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcpredefinedpointmarkersymbol.htm"
|
|
},
|
|
"IfcPreDefinedSymbol": {
|
|
"description": "A predefined symbol is a symbol that gets its shape information by a conforming name that is specified within subtypes of the entity.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcpredefinedsymbol.htm"
|
|
},
|
|
"IfcPreDefinedTerminatorSymbol": {
|
|
"description": "The pre defined terminator symbol is a pre defined symbol for the purpose to identify a terminator by name. Allowable names are: - 'blanked arrow', - 'blanked box', - 'blanked dot', - 'dimension origin', - 'filled arrow', - 'filled box', - 'filled dot', - 'integral symbol', - 'open arrow', - 'slash', - 'unfilled arrow' Illustration from ISO 10303-202, page 212:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcpredefinedterminatorsymbol.htm"
|
|
},
|
|
"IfcPreDefinedTextFont": {
|
|
"description": "The pre defined text font determines those qualified names which can be used for fonts that are in scope of the current data exchange specification (in contrary to externally defined text fonts). There are two choices: - _IfcDraughtingPreDefinedTextFont_for definitions from ISO/IS 10303-46:1994 for (old) vector based and monospace text. - _IfcTextStyleFontModel_for definitions from Cascading Style Sheets, level 1, W3C Recommendation 17 Dec 1996, revised 11 Jan 1999, CSS1, for all true type text. The use of the CSS1 definitions is the preferred way to represent text fonts.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifcpredefinedtextfont.htm"
|
|
},
|
|
"IfcPresentationLayerAssignment": {
|
|
"attributes": {
|
|
"AssignedItems": "The set of layered items, which are assigned to this layer.",
|
|
"Description": "Additional description of the layer.",
|
|
"Identifier": "An (internal) identifier assigned to the layer.",
|
|
"Name": "Name of the layer."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: The presentation layer assignment entity assigns an identifying name and optionally a description to a set of presentation and representation items. The presentation layer assignment provides the layer name (and optionally a description) for a collection of (styled or unstyled) representation items. Visibility and access control and layer style assignment (colour, line style, line width) is handled by the subtype IfcPresentationLayerAssignmentWithStyle.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifcpresentationlayerassignment.htm"
|
|
},
|
|
"IfcPresentationLayerWithStyle": {
|
|
"attributes": {
|
|
"LayerBlocked": "A logical setting, TRUE indicates that the layer is set to 'Blocked', FALSE that the layer is set to 'Not blocked', UNKNOWN that such information is not available.",
|
|
"LayerFrozen": "A logical setting, TRUE indicates that the layer is set to 'Frozen', FALSE that the layer is set to 'Not frozen', UNKNOWN that such information is not available.",
|
|
"LayerOn": "A logical setting, TRUE indicates that the layer is set to 'On', FALSE that the layer is set to 'Off', UNKNOWN that such information is not available.",
|
|
"LayerStyles": "Assignment of presentation styles to the layer to provide a default style for representation items. > NOTE In most cases the assignment of styles to a layer is restricted to an IfcCurveStyle representing the layer curve colour, layer curve thickness, and layer curve type."
|
|
},
|
|
"description": "An IfcPresentationLayerAssignmentWithStyle extends the presentation layer assignment with capabilities to define visibility control, access control and common style information. The visibility control allows to define a layer to be either 'on' or 'off', and/or 'frozen' or 'not frozen'. The access control allows to block graphical entities from manipulations by setting a layer to be either 'blocked' or 'not blocked'. Common style information can be given to the layer.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifcpresentationlayerwithstyle.htm"
|
|
},
|
|
"IfcPresentationStyle": {
|
|
"attributes": {
|
|
"Name": "Name of the presentation style."
|
|
},
|
|
"description": "Definition from IAI: An abstract generalization of style table for presentation information assigned to geometric representation items. It includes styles for curves, areas, surfaces, text and symbols. Style information may include colour, hatching, rendering, text fonts, etc. Each subtype of IfcPresentationStyle can be assigned to IfcGeometricRepresentationItem's via the IfcPresentationStyleAssignment through an intermediate IfcStyledItem or one of its subtypes.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcpresentationstyle.htm"
|
|
},
|
|
"IfcPresentationStyleAssignment": {
|
|
"attributes": {
|
|
"Styles": "A set of presentation styles that are assigned to styled items."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: The presentation style assignment is a set of styles which are assigned to styled items for the purpose of presenting these styled items.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcpresentationstyleassignment.htm"
|
|
},
|
|
"IfcProcedure": {
|
|
"attributes": {
|
|
"ProcedureID": "An identifying designation given to a procedure.",
|
|
"ProcedureType": "Predefined procedure types from which that required may be set.",
|
|
"UserDefinedProcedureType": "A user defined procedure type."
|
|
},
|
|
"description": "An IfcProcedure is an identifiable step to be taken within a process that is considered to occur over zero or a non-measurable period of time. Use Definitions An instance of IfcProcedure may nest other instances of IfcProcedure using IfcRelNests. Instances of IfcProcedure, since they are subtypes of IfcProcess, may also participate in sequence relationships using IfcRelSequences. IfcProcedure is used to capture information about stepped processes such as calibration, start/stop procedures for equipment items etc. Note that a particular type of IfcProcedure is a caution, warning or other form of advisory note. Typically, it is anticipated that such a procedure would be assigned to the specific IfcProcess for which it gives advice using IfcRelAssignsToProcess. Note that both nesting and sequencing can be supported concurrently. For example, B, C and D may be procedures nested in procedure A. Sequence relationships can also be established such that B precedes C and C precedes D.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprocessextension/lexical/ifcprocedure.htm"
|
|
},
|
|
"IfcProcess": {
|
|
"attributes": {
|
|
"IsPredecessorTo": "Relative placement in time, refers to the subsequent processes for which this process is predecessor.",
|
|
"IsSuccessorFrom": "Relative placement in time, refers to the previous processes for which this process is successor.",
|
|
"OperatesOn": "Set of Relationships to objects that are operated on by the process."
|
|
},
|
|
"description": "An action taking place in building construction with the intent of designing, costing, acquiring, constructing, or maintaining products or other and similar tasks or procedures. Processes are placed in sequence (including overlapping for parallel tasks) in time, the relationship IfcRelSequence it used to capture the predecessors and successors of the process. Processes can have resources assigned to it, this is handled by the relationship IfcRelAssignsToProcess.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcprocess.htm"
|
|
},
|
|
"IfcProduct": {
|
|
"attributes": {
|
|
"ObjectPlacement": "Placement of the product in space, the placement can either be absolute (relative to the world coordinate system), relative (relative to the object placement of another product), or constraint (e.g. relative to grid axes). It is determined by the various subtypes of IfcObjectPlacement, which includes the axis placement information to determine the transformation for the object coordinate system.",
|
|
"ReferencedBy": "Reference to the IfcRelAssignsToProduct relationship, by which other subtypes of IfcObject can be related to the product.",
|
|
"Representation": "Reference to the representations of the product, being either a representation (IfcProductRepresentation) or as a special case a shape representations (IfcProductDefinitionShape). The product definition shape provides for multiple geometric representations of the shape property of the object within the same object coordinate system, defined by the object placement."
|
|
},
|
|
"description": "Any object, or any aid to define, organize and annotate an object, that relates to a geometric or spatial context. Subtypes of IfcProduct usually hold a shape representation and a local placement within the project structure. This includes manufactured, supplied or created objects (referred to as elements) for incorporation into an AEC/FM project. This also includes objects that are created indirectly by other products, as spaces are defined by bounding elements. Products can be designated for permanent use or temporary use, an example for the latter is formwork. Products are defined by their properties and representations. In addition to physical products (covered by the subtype IfcElement) and spatial items (covered by the subtype IfcSpatialStructureElement) the IfcProduct also includes non-physical items, that relate to a geometric or spatial contexts, such as grid, port, annotation, structural actions, etc. Use Definition Any instance of IfcProduct defines a particular occurrence of a product, the common type information, that relates to many similar (or identical) occurrences of IfcProduct, is handled by the IfcTypeProduct (and its subtypes), assigned to one or many occurrences of IfcProduct by using the objectified relationship IfcRelDefinesByType. The IfcTypeProduct may provide, in addition to common properties, also a common geometric representation for all occurrences. An IfcProduct occurs at a specific location in space if it has a geometric representation assigned. It can be placed relatively to other products, but ultimately relative to the world coordinate system defined for this project. The inherited ObjectType attribute can be used to designate a particular type of the product instance. If subtypes of IfcProduct have a PredefinedType defined, the ObjectType is used to provide the user defined, particular type of the product instance, if the PredefinedType is set to USERDEFINED.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcproduct.htm"
|
|
},
|
|
"IfcProductDefinitionShape": {
|
|
"attributes": {
|
|
"HasShapeAspects": "Reference to the shape aspect that represents part of the shape or its feature distinctively.",
|
|
"ShapeOfProduct": "The _IfcProductDefinitionShape_ shall be used to provide a representation for a single instance of _IfcProduct_."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A product definition shape identifies a product\u2019s shape as the conceptual idea of the form of a product. Definition from IAI: The IfcProductDefinitionShape defines all shape relevant information about an IfcProduct. It allows for multiple geometric shape representations of the same product.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcproductdefinitionshape.htm"
|
|
},
|
|
"IfcProductRepresentation": {
|
|
"attributes": {
|
|
"Description": "The word or group of words that characterize the product representation. It can be used to add additional meaning to the name of the product representation.",
|
|
"Name": "The word or group of words by which the product representation is known.",
|
|
"Representations": "Contained list of representations (including shape representations). Each member defines a valid representation of a particular type within a particular representation context."
|
|
},
|
|
"description": "The IfcProductRepresentation defines a representation of a product, including its (geometric or topological) representation. A product can have zero, one or many geometric representations, and a single geometric representation can be shared among various products using mapped representations.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcproductrepresentation.htm"
|
|
},
|
|
"IfcProductsOfCombustionProperties": {
|
|
"attributes": {
|
|
"CO2Content": "Carbon Dioxide (CO~2~) content of the products of combustion. This is measured in weight of CO~2~ per unit weight and is therefore unitless.",
|
|
"COContent": "Carbon monoxide (CO) content of the products of combustion.This is measured in weight of CO per unit weight and is therefore unitless.",
|
|
"N20Content": "Nitrous Oxide (N~2~O) content of the products of combustion. This is measured in weight of N~2~O per unit weight and is therefore unitless.",
|
|
"SpecificHeatCapacity": "Specific heat of the products of combustion: heat energy absorbed per temperature unit. Usually measured in [J/kg K]."
|
|
},
|
|
"description": "Common definition to capture the properties of products of combustion generated by elements typically used within the context of building services and flow distribution systems.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcproductsofcombustionproperties.htm"
|
|
},
|
|
"IfcProfileDef": {
|
|
"attributes": {
|
|
"ProfileName": "Name of the profile type according to some standard profile table.",
|
|
"ProfileType": "Defines the type of geometry into which this profile definition shall be resolved, either a curve or a surface area. In case of curve the profile should be referenced by a swept surface, in case of area the profile should be referenced by a swept area solid."
|
|
},
|
|
"description": "Definition from IAI: The IfcProfileDef is the supertype of all definitions of standard and arbitrary profiles within IFC. It is used to define a standard set of commonly used profiles by their parameters or by their explicit curve geometry. Those profile definitions are used within the geometry and geometric model resource to create either swept surfaces, swept area solids, or sectioned spines. The purpose of the profile definition within the swept surfaces or swept area solids is to define a uniform cross section being swept: - along a line (extrusion) using IfcSurfaceOfLinearExtrusion or IfcExtrudedAreaSolid - along a circular arc (revolution) using IfcSurfaceOfRevolution or IfcRevolvedAreaSolid - along a directrix lying on a reference surface using IfcSurfaceCurveSweptAreaSolid The purpose fo the profile definition within the sectioned spine is to define a varying cross sections at several positions along a spine curve. The subtype IfcDerivedProfileDef is particularly suited to provide the consecutive profiles to be based on transformations of the start profile and thus maintaining the identity of vertices and edges. - Parameterized profiles are 2D primitives, which are used within the industry to describe cross sections by a description of its parameters. - Arbitrary profiles are cross sections defined by an outer boundary as bounded curve, which may also include holes, defined by inner boundaries. - Derived profiles, based on a transformation of a parent profile, are also part of the profile definitions available. - In addition composite profiles can be defined, which include two or more profile definitions to define the resulting profile. An IfcProfileDef is treated as bounded area if it is used within swept area solids. In this case, the inside of the profile is part of the profile. The attribute ProfileType is set to AREA. An IfcProfileDef is treated as a curve if it is used within swept surfaces. In this case, the inside of the profile (if the curve is closed) is not part of the profile. The attribute ProfileType is set to CURVE. The optional attribute ProfileName can be used to designate a standard profile type as e.g. given in profile tables for steel profiles. Illustration: Table: Use of parameterized profiles within the swept area solid Use cases: Results of the different usage of the ProfileType attribute are demonstrated here. The ProfileType defines whether the inside (the bounded area) is part of the profile definition (Area) or not (Curve). Table: Resulting area or curve depending on ProfileType",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcprofiledef.htm"
|
|
},
|
|
"IfcProfileProperties": {
|
|
"attributes": {
|
|
"ProfileDefinition": "Optional reference to an instance of IfcProfileDef, which contains a further geometrical definition.",
|
|
"ProfileName": "Standardized profile name as published in a profile table. All profile properties are applicable to this standardized profile name."
|
|
},
|
|
"description": "This is a collection of properties applicable to all linear structural members having a profile definition. The entity IfcProfileProperties contains additionally an optional reference to an instance of IfcProfileDef_which contains a further geometrical definition of this profile. The connection between instances of _IfcProfileProperties and IfcStructuralMembers is defined by using an instance of IfcRelAssociatesProfileProperties.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofilepropertyresource/lexical/ifcprofileproperties.htm"
|
|
},
|
|
"IfcProject": {
|
|
"attributes": {
|
|
"LongName": "Long name for the project as used for reference purposes.",
|
|
"Phase": "Current project phase, open to interpretation for all project partner, therefore given as IfcString.",
|
|
"RepresentationContexts": "Context of the representations used within the project. When the project includes shape representations for its components, one or several geometric representation contexts need to be included that define e.g. the world coordinate system, the coordinate space dimensions, and/or the precision factor.",
|
|
"UnitsInContext": "Units globally assigned to measure types used within the context of this project."
|
|
},
|
|
"description": "The undertaking of some design, engineering, construction, or maintenance activities leading towards a product. The project establishes the context for information to be exchanged or shared, and it may represent a construction project but does not have to. The representation context, in the case of a geometric representation context, which is referenced from the IfcProject, includes: - the default units used - the world coordinate system - the coordinate space dimension - the precision used within the geometric representations, and - optionally the indication of the true north relative to the world coordinate system *Property Set Use Definition*: The property sets relating to the IfcProject are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcProject are part of this IFC release: - Pset_ProjectCommon: common property set for the single project occurrence. *Spatial Structure Use Definition* The IfcProject is used to reference the root of the spatial structure of a building (that serves as the primary project breakdown and is required to be hierarchical). The spatial structure elements are linked together, and to the IfcProject, by using the objectified relationship IfcRelAggregates. The IfcProject references them by its inverse relationship: - IfcProject.Decomposes -- referencing (IfcSite || IfcBuilding) by IfcRelAggregates.RelatingObject. The IfcSite or IfcBuilding referenced shall be the root of the spatial structure. - IfcProject.IsDecomposedBy -- it shall be NIL, i.e. the IfcProject shall not be decomposed into any parts. Informal propositions: 1. There shall only be one project within the exchange context. This is enforced by the global rule IfcSingleProjectInstance.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcproject.htm"
|
|
},
|
|
"IfcProjectOrder": {
|
|
"attributes": {
|
|
"ID": "A unique identification assigned to a project order that enables its differentiation from other project orders.",
|
|
"Status": "The current status of a project order.Examples of status values that might be used for a project order status include: - PLANNED - REQUESTED - APPROVED - ISSUED - STARTED - DELAYED - DONE"
|
|
},
|
|
"description": "An IfcProjectOrder sets common properties for project orders issued in a construction or facilities management project. *Use Definitions* Actor attributes such as the organization to which the order is sent, issuing organization, person responsible atc. are handled by assigning instances of IfcActor through IfcRelAssignsToProjectOrder. The IfcActorRole must be asserted with the value of the role set when used in this context. A work plan (acting as a service) may be assigned to a project order (acting as a client) to describe how the project order should be fulfilled. This is handled by assigning instances of IfcWorkPlan through IfcRelAssignsToProjectOrder. The reverse of this situation may be true whereby the work plan (acting as a client) may have project orders (acting as a service). This is handled by assigning instances of IfcProjectOrder to an IfcWorkPlan through IfcRelAssignsToControl. Approvals including signoff, authorization etc. are handled using the the IfcRelAssociatesApproval relationship class. A cost schedule may be assigned to a project order are handled through the IfcRelAssignsToProjectOrder relationship. *Property Set Use Definition*: The property sets relating to an IfcProjectOrder are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcProjectOrder are part of this IFC release: - Pset_ProjectOrderChangeOrder: specific property set for the properties of a change order, if available - Pset_ProjectOrderMaintenanceWorkOrder: specific property set for the properties of a maintenance work order, if available - Pset_ProjectOrderMoveOrder: specific property set for the properties of a move order, if available - Pset_ProjectOrderPurchaseOrder: specific property set for the properties of a purchase order, if available - Pset_ProjectOrderWorkOrder: specific property set for the properties of a general work order, if available",
|
|
"predefined_types": {
|
|
"CHANGEORDER": "An instruction to make a change to a product or work being undertaken and a description of the work that is to be performed.",
|
|
"MAINTENANCEWORKORDER": "An instruction to carry out maintenance work and a description of the work that is to be performed.",
|
|
"MOVEORDER": "An instruction to move persons and artefacts and a description of the move locations, objects to be moved, etc.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"PURCHASEORDER": "An instruction to purchase goods and/or services and a description of the goods and/or services to be purchased that is to be performed.",
|
|
"USERDEFINED": "User-defined type.",
|
|
"WORKORDER": "A general instruction to carry out work and a description of the work to be done. Note the difference between a work order generally and a maintenance work order."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedmgmtelements/lexical/ifcprojectorder.htm"
|
|
},
|
|
"IfcProjectOrderRecord": {
|
|
"attributes": {
|
|
"Records": "Records in the sequence of occurrence the incident of a project order and the objects that are related to that project order. For instance, a maintenance incident will connect a work order with the objects (elements or assets) that are subject to the provisions of the work order"
|
|
},
|
|
"description": "An IfcProjectOrderRecord records information in sequence about the incidence of each order that is connected with one or a set of objects. Use Definitions Each IfcProjectOrderRecord is constrained to record a particular type of incident as indicated by the value of the enumeration IfcProjectOrderRecordTypeEnum.",
|
|
"predefined_types": {
|
|
"CHANGE": "",
|
|
"MAINTENANCE": "",
|
|
"MOVE": "",
|
|
"NOTDEFINED": "",
|
|
"PURCHASE": "",
|
|
"USERDEFINED": "",
|
|
"WORK": ""
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedmgmtelements/lexical/ifcprojectorderrecord.htm"
|
|
},
|
|
"IfcProjectionCurve": {
|
|
"description": "A projection curve is an annotated curve within a dimension that points to a point of the product shape that is measured.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcprojectioncurve.htm"
|
|
},
|
|
"IfcProjectionElement": {
|
|
"description": "The IfcProjectionElement is a specialization of the general feature element to represent projections applied to building elements. It represents a solid attached to any element that has physical manifestation. Projections must be handled by all sectors and disciplines in AEC/FM industry, therefore the interoperability for opening elements is provided at this high level. An IfcProjectionElement has to be linked to a building element (all subtypes of IfcBuildingElement) by using the IfcRelProjectsElement relationship. Its existence depends on the existence of the master element. ~~It is also directly linked to the spatial structure of the project (and here normally to the IfcBuildingStorey) by using the IfcRelContainedInSpatialStructure relationship~~. It should not be linked directly to the spatial structure of the project, i.e. the inverse relationship ContainedInStructure shall be NIL. It is assigned to the spatial structure through the element it projects. *Quantity Use Definition*: The quantities relating to the IfcProjectionElement are defined by the IfcElementQuantity and attached by the IfcRelDefinesByProperties. The following quantities are foreseen, but will be subjected to the local standard of measurement: *Geometry Use Definition* The geometric representation of IfcProjectionElement is given by the IfcProductDefinitionShape and IfcLocalPlacement allowing multiple geometric representations. Local Placement The local placement for IfcOpeningRecess is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement should point to the local placement of the same element, to which the projection adds, i.e. referred to by ProjectsElement.RelatingBuildingElement. Swept Solid Representation The geometric representation of IfcProjectionElement is defined using the swept area solid geometry. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'SweptSolid' The following additional constraints apply to the swept solid representation: - Solid: IfcExtrudedAreaSolid is required. - Profile: IfcRectangleProfileDef, IfcCircleProfileDef and IfcArbitraryClosedProfileDef shall be supported. - Extrusion: The profile shall be extruded horizontally (i.e. perpendicular to the extrusion direction of the modified element), e.g. for wall projections, or vertically (i.e. in the extrusion direction of the projected element), e.g., for floor projections. EXAMPLE Brep Representation The general b-rep geometric representation of IfcProjectionElement is defined using the Brep geometry. The Brep representation allows for the representation of complex element shape. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'Brep'",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcprojectionelement.htm"
|
|
},
|
|
"IfcProperty": {
|
|
"attributes": {
|
|
"Description": "Informative text to explain the property.",
|
|
"Name": "Name for this property. This label is the significant name string that defines the semantic meaning for the property.",
|
|
"PartOfComplex": "Reference to the IfcComplexProperty in which the IfcProperty is contained.",
|
|
"PropertyDependsOn": "The relating property on which the value of the property depends.",
|
|
"PropertyForDependance": "The property on whose value that of another property depends."
|
|
},
|
|
"description": "An abstract generalization for all types of properties that can be associated with IFC objects through the property set mechanism.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifcproperty.htm"
|
|
},
|
|
"IfcPropertyBoundedValue": {
|
|
"attributes": {
|
|
"LowerBoundValue": "Lower bound value for the interval defining the property value. If the value is not given, it indicates an open bound (all values to be lower than or equal to UpperBoundValue).",
|
|
"Unit": "Unit for the upper and lower bound values, if not given, the default value for the measure type (given by the TYPE of the upper and lower bound values) is used as defined by the global unit assignment at IfcProject.",
|
|
"UpperBoundValue": "Upper bound value for the interval defining the property value. If the value is not given, it indicates an open bound (all values to be greater than or equal to LowerBoundValue)."
|
|
},
|
|
"description": "A property with a bounded value (IfcPropertyBoundedValue) defines a property object which has a maximum of two (numeric or descriptive) values assigned, the first value specifying the upper bound and the second value specifying the lower bound. It defines a property - value bound (min-max) combination for which the property name, the upper bound value with measure type, the lower bound value with measure type (and optional the unit) is given. The unit is handled by the Unit attribute: - If the Unit attribute is not given, then the unit is already implied by the type of IfcMeasureValue or IfcDerivedMeasureValue. The associated unit can be found at the IfcUnitAssignment globally defined at the project level (IfcProject.UnitsInContext). - If the Unit attribute is given, then the unit assigned by the Unit attribute overrides the globally assigned unit. The IfcPropertyBoundedValue allows for the specification of an interval for the value component of the property description. If either the LowerBoundValue or the UpperBoundValue is not given, then it indicates an open bound (either a minimum value or a maximum value). The interval is by definition inclusive, i.e. the value given for the LowerBoundValue or the UpperBoundValue is included in the interval. Examples of a property with bounded value are: Informal proposition: - If the measure type for the upper and lover bound value is a numeric measure, then the following shall be true: UpperBoundValue > LowerBoundValue.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifcpropertyboundedvalue.htm"
|
|
},
|
|
"IfcPropertyConstraintRelationship": {
|
|
"attributes": {
|
|
"Description": "A description that may apply additional information about a property constraint relationship.",
|
|
"Name": "A name used to identify or qualify the property constraint relationship.",
|
|
"RelatedProperties": "The properties to which a constraint is to be related.",
|
|
"RelatingConstraint": "The constraint that is to be related."
|
|
},
|
|
"description": "An IfcPropertyConstraintRelationship is a relationship class that enables a constraint to be related to one or more properties. An IfcPropertyConstraintRelationship allows for the specification of a constraint to be applied to many properties. The constraints applied therefore enable a property to carry values identifying requirements as well as those identifying the fulfilment of those requirements. The example below shows how a constraint may be applied to a property within a property set. For simplicity, only the mandatory attributes are shown as asserted. It shows how a property 'ThingWeight' which has a nominal value of 19.5 kg has two constraints that are logically aggregated by an AND connection. One of the constraints has a benchmark of 'GREATERTHANOREQUALTO' whilst the second has a benchmark of 'LESSTHANOREQUALTO'. This means that the constraint must lie between these two bounding values. The relating constraint is instantiated as an objective named as 'Weight Constraint' and qualified as a SPECIFICATION constraint. The two related constraints are both specified as metrics since they can have specific values.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstraintresource/lexical/ifcpropertyconstraintrelationship.htm"
|
|
},
|
|
"IfcPropertyDefinition": {
|
|
"attributes": {
|
|
"HasAssociations": "Reference to the relationship IfcRelAssociates and thus to those externally defined concepts, like classifications, documents, or library information, which are associated to the property definition."
|
|
},
|
|
"description": "The IfcPropertyDefinition defines the generalization of all characteristics (i.e. a grouping of individual properties), that may be assigned to objects. Currently, subtypes of IfcPropertyDefinition include property set definitions, and property sets.. Property definitions define information that is shared among multiple instances of objects. The assignment of the shared information to objects is handled by the IfcRelDefines relationship.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcpropertydefinition.htm"
|
|
},
|
|
"IfcPropertyDependencyRelationship": {
|
|
"attributes": {
|
|
"DependantProperty": "The dependant property.",
|
|
"DependingProperty": "The property on which the relationship depends.",
|
|
"Description": "Additional description of the dependency.",
|
|
"Expression": "Expression that further describes the nature of the dependency relation.",
|
|
"Name": "Name of the relationship that provides additional meaning to the nature of the dependency."
|
|
},
|
|
"description": "An IfcPropertyDependencyRelationship describes an identified dependency between the value of one property and that of another. While the IfcPropertyDependencyRelationship may be used to describe the dependency, and it may do so in terms of the expression of how the dependency operates, it is not possible through the current IFC model for the value of the related property to be actually derived from the value of the relating property. The determination of value according to the dependency is required to be performed by an application that can then use the Expression attribute to flag the form of the dependency.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifcpropertydependencyrelationship.htm"
|
|
},
|
|
"IfcPropertyEnumeratedValue": {
|
|
"attributes": {
|
|
"EnumerationReference": "Enumeration from which a enumeration value has been selected. The referenced enumeration also establishes the unit of the enumeration value.",
|
|
"EnumerationValues": "Enumeration values, which shall be listed in the referenced IfcPropertyEnumeration, if such a reference is provided."
|
|
},
|
|
"description": "A property with an enumerated value (IfcPropertyEnumeratedValue) defines a property object which has a value assigned which is chosen from an enumeration. It defines a property - value combination for which the property name, the value with measure type (and optional the unit) are given. The unit is handled by the Unit attribute of the IfcPropertyEnumeration: - If the Unit attribute is not given, then the unit is already implied by the type of IfcMeasureValue or IfcDerivedMeasureValue. The associated unit can be found at the IfcUnitAssignment globally defined at the project level (IfcProject.UnitsInContext). - If the Unit attribute is given, then the unit assigned by the unit attribute overrides the globally assigned unit. More precisely: The IfcPropertyEnumeratedValue defines a property, which value is selected from a defined list of enumerators. The enumerators are stored in a dynamic enumeration of values including the type information from IfcValue (see IfcPropertyEnumeration). This enables applications to use an enumeration value as a property within a property set (IfcPropertySet) including the allowed list of values. Examples of a property with enumerated value with are: The IfcPropertyEnumeratedValue refers to an IfcPropertyEnumeration, e.g. for the above:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifcpropertyenumeratedvalue.htm"
|
|
},
|
|
"IfcPropertyEnumeration": {
|
|
"attributes": {
|
|
"EnumerationValues": "List of values that form the enumeration.",
|
|
"Name": "Name of this enumeration.",
|
|
"Unit": "Unit for the enumerator values, if not given, the default value for the measure type (given by the TYPE of nominal value) is used as defined by the global unit assignment at IfcProject."
|
|
},
|
|
"description": "A collection of simple or measure values that define a prescribed set of alternatives from which 'enumeration values' are selected. This enables inclusion of enumeration values in property sets. IfcPropertyEnumeration provides a name for the enumeration as well as a list of unique (numeric or descriptive) values (that may have a measure type assigned). The entity defines the list of potential enumerators to be exchanged together (or separately) with properties of type IfcPropertyEnumeratedValue that selects their actual property values from this enumeration. The unit is handled by the Unit attribute: - If the Unit attribute is not given, than the unit is already implied by the type of IfcMeasureValue or IfcDerivedMeasureValue. The associated unit can be found at the IfcUnitAssignment globally defined at the project level (IfcProject.UnitsInContext). - If the Unit attribute is given, the unit assigned by the unit attribute overrides the globally assigned unit.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifcpropertyenumeration.htm"
|
|
},
|
|
"IfcPropertyListValue": {
|
|
"attributes": {
|
|
"ListValues": "List of values.",
|
|
"Unit": "Unit for the list values, if not given, the default value for the measure type (given by the TYPE of nominal value) is used as defined by the global unit assignment at IfcProject."
|
|
},
|
|
"description": "An IfcPropertyListValue defines a property that has several (numeric or descriptive) values assigned, these values are given by an ordered list. An IfcPropertyListValue is a list of values. The order in which values appear is significant. Each value in the list is unique i.e. no duplicate values are allowed. All list members should be of the same type. The unit applicable to all values is handled by the Unit attribute: - If the Unit attribute is not given, then the unit is already implied by the type of IfcMeasureValue or IfcDerivedMeasureValue. The associated unit can be found at the IfcUnitAssignment globally defined at the project level (IfcProject.UnitsInContext). - If the Unit attribute is given, then the unit assigned by the Unit attribute overrides the globally assigned unit. Example of a property with list value is:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifcpropertylistvalue.htm"
|
|
},
|
|
"IfcPropertyReferenceValue": {
|
|
"attributes": {
|
|
"PropertyReference": "Reference to another entity through one of the select types in IfcObjectReferenceSelect.",
|
|
"UsageName": "Description of the use of the referenced value within the property."
|
|
},
|
|
"description": "The IfcPropertyReferenceValue allows a property value to be given by referencing other entities within the resource definitions of IFC. Those other entities are regarded as predefined complex properties and can be aggregated within a property set (IfcPropertySet). The allowable entities to be used as value references are given by the IfcObjectReferenceSelect.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifcpropertyreferencevalue.htm"
|
|
},
|
|
"IfcPropertySet": {
|
|
"attributes": {
|
|
"HasProperties": "Contained set of properties. For property sets defined as part of the IFC Object model, the property objects within a property set are defined as part of the standard. If a property is not contained within the set of predefined properties, its value has not been set at this time."
|
|
},
|
|
"description": "The IfcPropertySet defines all dynamically extensible properties. The property set is a container class that holds properties within a property tree. These properties are interpreted according to their name attribute. Property sets, defining a particular type of object, can be assigned an object type (IfcTypeObject). Property sets are assigned to objects (IfcObject) through an objectified relationship (IfcRelDefinedByProperties). If the same set of properties applies to more than one object, it should be assigned by a single instance of IfcRelDefinedByProperties to a set of related objects. Those property sets are referred to as shared property sets. Use Definition Instances of IfcPropertySet are used to assign named sets of individual properties (complex or single properties). Each individual property has a significant name string. Some property sets have predefined instructions on assigning those significant name, these are listed under \"property sets\" main menu item within this specification. The naming convention \"Pset_Xxx\" applies to those property sets and shall be used as the value to the Name attribute. In addition any user defined property set can be captured, those property sets shall have a Name value not including the \"Pset_\" prefix.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcpropertyset.htm"
|
|
},
|
|
"IfcPropertySetDefinition": {
|
|
"attributes": {
|
|
"DefinesType": "The property style to which the property set might belong.",
|
|
"PropertyDefinitionOf": "Reference to the relation to one or many objects that are characterized by the property definition. The reference may be omitted, if the property definition is used to define a style library and no instances, to which the particular style of property set is associated, exist yet."
|
|
},
|
|
"description": "An IfcPropertySetDefinition is a generalization of property sets, that are either: The subtypes of the IfcPropertySetDefinition are either the dynamically extendable IfcPropertySet, or all other statically defined subtypes.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcpropertysetdefinition.htm"
|
|
},
|
|
"IfcPropertySingleValue": {
|
|
"attributes": {
|
|
"NominalValue": "Value and measure type of this property. > NOTE By virtue of the defined data type, that is selected from the SELECT IfcValue, the appropriate unit can be found within the IfcUnitAssignment, defined for the project if no value for the unit attribute is given.",
|
|
"Unit": "Unit for the nominal value, if not given, the default value for the measure type (given by the TYPE of nominal value) is used as defined by the global unit assignment at IfcProject."
|
|
},
|
|
"description": "A property with a single value (IfcPropertySingleValue) defines a property object which has a single (numeric or descriptive) value assigned. It defines a property - single value combination for which the property name, the value with measure type (and optionally the unit) is given. The unit is handled by the Unit attribute: - If the Unit attribute is not given, then the unit is already implied by the type of IfcMeasureValue or IfcDerivedMeasureValue. The associated unit can be found at the IfcUnitAssignment globally defined at the project level (IfcProject.UnitsInContext). - If the Unit attribute is given, then the unit assigned by the Unit attribute overrides the globally assigned unit. Examples of a property with single value are:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifcpropertysinglevalue.htm"
|
|
},
|
|
"IfcPropertyTableValue": {
|
|
"attributes": {
|
|
"DefinedUnit": "Unit for the defined values, if not given, the default value for the measure type (given by the TYPE of the defined values) is used as defined by the global unit assignment at IfcProject.",
|
|
"DefinedValues": "Defined values which are applicable for the scope as defined by the defining values.",
|
|
"DefiningUnit": "Unit for the defining values, if not given, the default value for the measure type (given by the TYPE of the defining values) is used as defined by the global unit assignment at IfcProject.",
|
|
"DefiningValues": "List of defining values, which determine the defined values.",
|
|
"Expression": "Expression for the derivation of defined values from the defining values, the expression is given for information only, i.e. no automatic processing can be expected from the expression."
|
|
},
|
|
"description": "A property with a range value (IfcPropertyTableValue) defines a property object which has two lists of (numeric or descriptive) values assigned, the values specifying a table with two columns. The defining values provide the first column and establish the scope for the defined values (the second column). Interpolations are out of scope of the IfcPropertyTableValue. An optional Expression attribute may give the equation used for deriving the range value, which is for information purposes only. The IfcPropertyTableValue defines a defining/defined property value combination for which the property name, the table with defining and defined values with measure type (and optional the units for defining and defined values)are given. The units are handled by the DefiningUnit and DefinedUnit attributes: - If the DefiningUnit or DefinedUnit attribute is not given, then the unit is already implied by the type of IfcMeasureValue or IfcDerivedMeasureValue. The associated unit can be found at the IfcUnitAssignment globally defined at the project level (IfcProject.UnitsInContext). - If the DefiningUnit or DefinedUnit attribute is given, then the unit assigned by the unit attribute overrides the globally assigned unit. The IfcPropertyTableValue allows for the specification of a table of defining/defined value pairs of the property description. Examples of a property with range value are: Informal propositions: - The list of DerivedValues and the list of DefiningValues are corresponding lists.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifcpropertytablevalue.htm"
|
|
},
|
|
"IfcProtectiveDeviceType": {
|
|
"description": "An IfcProtectiveDeviceType is a device that breaks an electrical circuit when a stated electric current that passes through it is exceeded. *Use Definitions* An IfcProtectiveDeviceType is a subtype of IfcFlowControllerType that provides for various devices that ensure the safety of an electrical circuit. Usage of IfcProtectiveDeviceType defines the parameters for one or more occurrences of IfcFlowController. Parameters are specified through property sets that are enumerated in the IfcIfcProtectiveDeviceTypeEnum data type. *Property Set Use Definition*: The property sets relating to the IfcProtectiveDeviceType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcProtectiveDeviceType are part of this IFC release: - Pset_ElectricalDeviceCommon: property set for properties that are common to all types of electrical devices, if available - Pset_ProtectiveDeviceTypeCommon: property set for properties that are common to all types of protective device, if available - Pset_ProtectiveDeviceTypeCircuitBreaker: specific property set for the properties of a circuit breaker , if available - Pset_ProtectiveDeviceTypeEarthFailureDevice: specific property set for the properties of an earth failure device, if available - Pset_ProtectiveDeviceTypeFuseDisconnector: specific property set for the properties of a fuse disconnector, if available - Pset_ProtectiveDeviceTypeResidualCurrentCircuitBreaker: specific property set for the properties of a residual current circuit breaker, if available - Pset_ProtectiveDeviceTypeResidualCurrentSwitch: specific property set for the properties of a residual current switch, if available - Pset_ProtectiveDeviceTypeVaristor: specific property set for the properties of a varistor, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"CIRCUITBREAKER": "A mechanical switching device capable of making, carrying, and breaking currents under normal circuit conditions and also making, carrying for a specified time and breaking, current under specified abnormal circuit conditions such as those of short circuit.",
|
|
"EARTHFAILUREDEVICE": "",
|
|
"FUSEDISCONNECTOR": "A device that will electrically open the circuit after a period of prolonged, abnormal current flow.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"RESIDUALCURRENTCIRCUITBREAKER": "A device that opens, closes, or isolates a circuit and has short circuit and overload protection. It attempts to break the circuit when there is a difference in current between any two phases. May also be referred to as 'Ground Fault Interupter (GFI)' or 'Ground Fault Circuit Interuptor (GFCI)'",
|
|
"RESIDUALCURRENTSWITCH": "A device that opens, closes or isolates a circuit and has no short circuit or overload protection. May also be identified as a 'ground fault switch'.",
|
|
"USERDEFINED": "User-defined type.",
|
|
"VARISTOR": "A high voltage surge protection device."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcprotectivedevicetype.htm"
|
|
},
|
|
"IfcProxy": {
|
|
"attributes": {
|
|
"ProxyType": "High level (and only) semantic meaning attached to the IfcProxy, defining the basic construct type behind the Proxy, e.g. Product or Process.",
|
|
"Tag": "The tag (or label) identifier at the particular instance of a product, e.g. the serial number, or the position number. It is the identifier at the occurrence level."
|
|
},
|
|
"description": "The IfcProxy is intended to be a kind of a container for wrapping objects which are defined by associated properties, which may or may not have a geometric representation and placement in space. A proxy may have a semantic meaning, defined by the Name attribute, and property definitions, attached through the property assignment relationship, which definition may be outside of the definitions given by the current release of IFC. The ProxyType may give an indication to which high level semantic breakdown of object the semantic definition of the proxy relates to. the Tag attribute may be used to assign a human or system interpretable identifier (such as a serial number or bar code).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcproxy.htm"
|
|
},
|
|
"IfcPumpType": {
|
|
"description": "The element type IfcPumpType defines a list of commonly shared property set definitions of a pump and an optional set of product representations. It is used to define a pump specification (i.e. the specific product information, that is common to all occurrences of that product type). A pump type is used to define the common properties of a pump that may be applied to many occurrences of that type. A pump is a device which imparts mechanical work on a liquid. A typical use of a pump is to circulate chilled water or heating hot water in a building services distribution system. Pump types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcPumpType are represented by instances of IfcFlowMovingDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_PumpTypeCommon: common property set for all pump types",
|
|
"predefined_types": {
|
|
"CIRCULATOR": "A Circulator pump is a generic low-pressure, low-capacity pump. It may have a wet rotor and may be driven by a flexible-coupled motor.",
|
|
"ENDSUCTION": "An End Suction pump, when mounted horizontally, has a single horizontal inlet on the impeller suction side and a vertical discharge. It may have a direct or close-coupled motor.",
|
|
"NOTDEFINED": "Pump type has not been defined.",
|
|
"SPLITCASE": "A Split Case pump, when mounted horizontally, has an inlet and outlet on each side of the impeller. The impeller can be easily accessed by removing the front of the impeller casing. It may have a direct or close-coupled motor.",
|
|
"USERDEFINED": "User-defined pump type.",
|
|
"VERTICALINLINE": "A Vertical Inline pump has the pump and motor close-coupled on the pump casing. The pump depends on the connected, horizontal piping for support, with the suction and discharge along the piping axis.",
|
|
"VERTICALTURBINE": "A Vertical Turbine pump has a motor mounted vertically on the pump casing for either\n wet-pit sump mounting or dry-well mounting."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcpumptype.htm"
|
|
},
|
|
"IfcQuantityArea": {
|
|
"attributes": {
|
|
"AreaValue": "Area measure value of this quantity."
|
|
},
|
|
"description": "A physical quantity, IfcQuantityArea, that defines a derived area measure to provide an element's physical property. It is normally derived from the physical properties of the element under the specific measure rules given by a method of measurement.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcquantityarea.htm"
|
|
},
|
|
"IfcQuantityCount": {
|
|
"attributes": {
|
|
"CountValue": "Count measure value of this quantity."
|
|
},
|
|
"description": "An physical quantity, IfcQuantityCount, that defines a derived count measure to provide an element's physical property. It is normally derived from the physical properties of the element under the specific measure rules given by a method of measurement.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcquantitycount.htm"
|
|
},
|
|
"IfcQuantityLength": {
|
|
"attributes": {
|
|
"LengthValue": "Length measure value of this quantity."
|
|
},
|
|
"description": "A physical quantity, IfcQuantityLength, that defines a derived length measure to provide an element's physical property. It is normally derived from the physical properties of the element under the specific measure rules given by a method of measurement.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcquantitylength.htm"
|
|
},
|
|
"IfcQuantityTime": {
|
|
"attributes": {
|
|
"TimeValue": "Time measure value of this quantity."
|
|
},
|
|
"description": "An element quantity that defines a time measure to provide an property of time related to an element. It is normally given by the recipe information of the element under the specific measure rules given by a method of measurement.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcquantitytime.htm"
|
|
},
|
|
"IfcQuantityVolume": {
|
|
"attributes": {
|
|
"VolumeValue": "Volume measure value of this quantity."
|
|
},
|
|
"description": "A physical quantity that defines a derived volume measure to provide an element's physical property. It is normally derived from the physical properties of the element under the specific measure rules given by a method of measurement.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcquantityvolume.htm"
|
|
},
|
|
"IfcQuantityWeight": {
|
|
"attributes": {
|
|
"WeightValue": "Mass measure value of this quantity."
|
|
},
|
|
"description": "A physical element quantity that defines a derived weight measure to provide an element's physical property. It is normally derived from the physical properties of the element under the specific measure rules given by a method of measurement.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcquantityweight.htm"
|
|
},
|
|
"IfcRadiusDimension": {
|
|
"description": "The radial dimension is a draughting callout that presents the radial length of a conic element. It consists of a dimension curve and may have projection curves (but is often defined without projection curves). Illustration:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcradiusdimension.htm"
|
|
},
|
|
"IfcRailing": {
|
|
"description": "Definition of IAI: The railing is a frame assembly adjacent to human circulation spaces and at some space boundaries where it is used in lieu of walls or to complement walls. Designed to aid humans, either as an optional physical support, or to prevent injury by falling. A list of references to accessory/mounting hardware for this railing might be given by including these assessories (IfcDiscreteAssessory) through the objectified relationship IfcRelAggregates. *Property Set Use Definition*: The property sets relating to the IfcRailing are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcRailing are part of this IFC release: - Pset_RailingCommon: common property set for all railing occurrences *Geometry Use Definitions* The geometric representation of IfcRailing is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local placement The local placement for IfcRailing is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level - If the IfcRailing, however, is used by an IfcStair or IfcRamp, and this container class defines its own local placement, then the PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the aggregate. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Geometric Representation Currently the use of 'BoundingBox', 'SurfaceModel', 'Brep' and 'MappedRepresentation' representations of IfcRailing are supported. The conventions to use these representations are given at the level of the supertype, IfcBuildingElement.",
|
|
"predefined_types": {
|
|
"BALUSTRADE": "Similar to the definitions of a guardrail except the location is at the edge of a floor, rather then a stair or ramp. Examples are balustrates at roof-tops or balconies.",
|
|
"GUARDRAIL": "A type of railing designed to guard human occupants from falling off a stair, ramp or landing where there is a vertical drop at the edge of such floors/landings.",
|
|
"HANDRAIL": "A type of railing designed to serve as an optional structural support for loads applied by human occupants (at hand height). Generally located adjacent to ramps and stairs. Generally floor or wall mounted.",
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|
"NOTDEFINED": "Undefined railing element, no type information available.",
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|
"USERDEFINED": "User-defined railing element, a term to identify the user type is given by the attribute _IfcRailing.ObjectType._"
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|
},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcrailing.htm"
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|
},
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|
"IfcRailingType": {
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|
"description": "The element type (IfcRailingType) defines a list of commonly shared property set definitions of a railing element and an optional set of product representations. It is used to define a railing specification (i.e. the specific product information, that is common to all occurrences of that product type). A railing type is used to define the common properties of a certain type of railing that may be applied to many instances of that type to assign a specific style. Railing types may be exchanged without being already assigned to occurrences. The occurrences of the IfcRailingType are represented by instances of IfcRailing.",
|
|
"predefined_types": {
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|
"BALUSTRADE": "Similar to the definitions of a guardrail except the location is at the edge of a floor, rather then a stair or ramp. Examples are balustrates at roof-tops or balconies.",
|
|
"GUARDRAIL": "A type of railing designed to guard human occupants from falling off a stair, ramp or landing where there is a vertical drop at the edge of such floors/landings.",
|
|
"HANDRAIL": "A type of railing designed to serve as an optional structural support for loads applied by human occupants (at hand height). Generally located adjacent to ramps and stairs. Generally floor or wall mounted.",
|
|
"NOTDEFINED": "Undefined railing element, no type information available.",
|
|
"USERDEFINED": "User-defined railing element, a term to identify the user type is given by the attribute _IfcRailing.ObjectType._"
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcrailingtype.htm"
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|
},
|
|
"IfcRamp": {
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|
"attributes": {
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|
"ShapeType": "Predefined shape types for a ramp that are specified in an Enum."
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|
},
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|
"description": "Definition from ISO 6707-1:1989: Inclined way or floor joining two surfaces at different levels. Definition of IAI: An vertical passageway which provides a human circulation link between one floor level and another floor level at a different elevation. It may include a landing as an intermediate floor slab. A ramp normally does not include steps (stepped ramps are out of scope for this IFC Release). The ramp is a container entity that aggregates all components of the ramp, it represents. The aggregation is handled via the IfcRelAggregates relationship, relating an IfcRamp with the related flights (IfcRampFlight) and landings (IfcSlab with type 'Landing'). *Property Set Use Definition*: The property sets relating to the IfcRamp are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcRamp are part of this IFC release: - Pset_RampCommon: common property set for all ramp occurrences *Geometry Use Definitions*: The geometric representation of IfcRamp is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Independent geometric representations should only be used when the IfcRamp is not defined as an aggregate. If defined as an aggregate, the geometric representation is the sum of the representation of the components within the aggregate. Local placement The local placement for IfcRamp is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. If the LocalPlacement is given for the IfcRamp, then all components, which are aggregated to the ramp should use this placement as their relative placement. Geometric Representations If the IfcRamp has components (referenced by SELF\\IfcProduct.IsDecomposedBy) then no independent geometric representation shall be defined for the IfcRamp. The IfcRamp is then geometrically represented by the geometric representation of its components. The components are accessed via SELF\\IfcProduct.IsDecomposedBy[1].RelatedObjects. If the IfcRamp has no components defined (empty set of SELF\\IfcProduct.IsDecomposedBy) then the IfcRamp may be represented by an IfcShapeRepresentation with the RepresentationType = 'Brep'. Illustration:",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcramp.htm"
|
|
},
|
|
"IfcRampFlight": {
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|
"description": "Inclined slab segment, normally providing a human circulation link between two landings, floors or slabs at different elevations. An IfcRampFlight is normally aggregated by a ramp (IfcRamp) through the IfcRelAggregates relationship, the ramp flight is then included in the set of IfcRelAggregates.RelatedObjects. A ramp flight normally connects the floor slab of zero to two different storeys (or partial storeys) within a building. The connection relationship between the IfcRampFlight and the IfcSlab is expressed using the IfcRelConnectsElements relationship. *Property Set Use Definition*: The property sets relating to the IfcRampFlight are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcRampFlight are part of this IFC release: - Pset_RampFlightCommon: common property set for all ramp flight occurrences *Geometry Use Definitions*: The geometric representation of IfcRampFlight is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local placement The local placement for IfcRampFlight is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level. - If the IfcRampFlight, however, is used by an IfcRamp, and this container class defines its own local placement, then the PlacementRelTo relationship of IfcLocalPlacement shall point to the local placement of the aggregate. Standard Geometric Representation The standard geometric representation of IfcRampFlight is defined using the swept area geometry. The following constraints apply to the standard representation: - Solid: IfcExtrudedAreaSolid is required, - Profile: IfcRectangleProfileDef shall be supported. - Extrusion: The profile shall be extruded in any direction relative to the XY plane of the position coordinate system of the IfcExtrudedAreaSolid. Therefore non-perpendicular sweep operation has to be supported. It might be further constrained to be in the direction of the global z-axis in implementers agreements.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcrampflight.htm"
|
|
},
|
|
"IfcRampFlightType": {
|
|
"description": "The element type (IfcRampFlightType) defines a list of commonly shared property set definitions of a ramp flight and an optional set of product representations. It is used to define an ramp flight specification (i.e. the specific product information, that is common to all occurrences of that product type). A ramp flight type is used to define the common properties of a certain type of a ramp flight that may be applied to many instances of that type to assign a specific style. Ramp flight types may be exchanged without being already assigned to occurrences. The occurrences of the IfcRampFlightType are represented by instances of IfcRampFlight.",
|
|
"predefined_types": {
|
|
"NOTDEFINED": "Undefined ramp flight.",
|
|
"SPIRAL": "A ramp flight with a circular or elliptic walking line.",
|
|
"STRAIGHT": "A ramp flight with a straight walking line.",
|
|
"USERDEFINED": "User-defined ramp flight."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcrampflighttype.htm"
|
|
},
|
|
"IfcRationalBezierCurve": {
|
|
"attributes": {
|
|
"Weights": "The array of weights associated with the control points. This is derived from the weights data. IfcListToArray(WeightsData,0,SELF\\IfcBSplineCurve.UpperIndexOnControlPoints)",
|
|
"WeightsData": "The supplied values of the weights."
|
|
},
|
|
"description": "A rational Bezier curve is a B-spline curve described in terms of control points and basic functions. It describes weights in addition to the control points defined at the supertype IfcBSplineCurve. All weights shall be positive and the curve is given by: where",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcrationalbeziercurve.htm"
|
|
},
|
|
"IfcRectangleHollowProfileDef": {
|
|
"attributes": {
|
|
"InnerFilletRadius": "Radius of the circular arcs, by which all four corners of the outer contour of rectangle are equally rounded. If not given, zero (= no rounding arcs) applies.",
|
|
"OuterFilletRadius": "Radius of the circular arcs, by which all four corners of the outer contour of rectangle are equally rounded. If not given, zero (= no rounding arcs) applies.",
|
|
"WallThickness": "Thickness of the material."
|
|
},
|
|
"description": "Definition from IAI: The IfcRectangleHollowProfileDef defines a section profile that provides the defining parameters of a rectangular (or square) hollow section to be used by the swept surface geometry or the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration. A square hollow section can be defined by equal values for h and b. The centre of the position coordinate system is in the profiles centre of the bounding box (for symmetric profiles identical with the centre of gravity). Normally, the longer sides are parallel to the y-axis, the shorter sides parallel to the x-axis. Illustration: Figure: Parameters of rectangular or square hollow profile definition",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcrectanglehollowprofiledef.htm"
|
|
},
|
|
"IfcRectangleProfileDef": {
|
|
"attributes": {
|
|
"XDim": "The extent of the rectangle in the direction of the x-axis.",
|
|
"YDim": "The extent of the rectangle in the direction of the y-axis."
|
|
},
|
|
"description": "Definition from IAI: The IfcRectangleProfileDef defines a rectangle as the profile definition used by the swept surface geometry or the swept area solid. It is given by its X extent and its Y extent, and placed within the 2D position coordinate system, established by the Position attribute. It is placed centric within the position coordinate system. Illustration: Table: Parameter of rectangle profile definition",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcrectangleprofiledef.htm"
|
|
},
|
|
"IfcRectangularPyramid": {
|
|
"attributes": {
|
|
"Height": "The height of the apex above the plane of the base, measured in the direction of the placement Z axis, the _SELF\\IfcCsgPrimitive3D.Position.P[2]_.",
|
|
"XLength": "The length of the base measured along the placement X axis. It is provided by the inherited axis placement through _SELF\\IfcCsgPrimitive3D.Position.P[1]_.",
|
|
"YLength": "The length of the base measured along the placement Y axis. It is provided by the inherited axis placement through _SELF\\IfcCsgPrimitive3D.Position.P[2]_."
|
|
},
|
|
"description": "Definition from ISO 10303-42:ed.2, 2000: A rectangular pyramid is a solid pyramid with a rectangular base. The apex of the pyramid is directly above the centre point of the base. The rectangular pyramid is specified by its position, which provides a placement coordinate system, its length, depth and height. The inherited Position attribute defines the IfcAxis2Placement3D and provides the location and orientation of the pyramid: - SELF\\IfcCsgPrimitive3D.Position: The position defines a placement coordinate system for the pyramid. - SELF\\IfcCsgPrimitive3D.Position.Location: The pyramid has one corner of its base at the location and the edges of the base are aligned with the first two placement axes in the positive sense.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcrectangularpyramid.htm"
|
|
},
|
|
"IfcRectangularTrimmedSurface": {
|
|
"attributes": {
|
|
"BasisSurface": "Surface being trimmed.",
|
|
"Dim": "BasisSurface.Dim",
|
|
"U1": "First u parametric value.",
|
|
"U2": "Second u parametric value.",
|
|
"Usense": "Flag to indicate whether the direction of the first parameter of the trimmed surface agrees with or opposes the sense of u in the basis surface.",
|
|
"V1": "First v parametric value.",
|
|
"V2": "Second v parametric value.",
|
|
"Vsense": "Flag to indicate whether the direction of the second parameter of the trimmed surface agrees with or opposes the sense of v in the basis surface."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: The trimmed surface is a simple bounded surface in which the boundaries are the constant parametric lines u~1~ = u1, u~2~ = u2, v~1~ = v1 and v~2~ = v2. All these values shall be within the parametric range of the referenced surface. Cyclic properties of the parameter range are assumed. The rectangular trimmed surface inherits its parameterization directly from the basis surface and has parameter ranges from 0 to |u~2~ - u~1~| and 0 to |v~2~-v~1~|. Informal propositions: - The domain of the trimmed surface shall be within the domain of the surface being trimmed.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcrectangulartrimmedsurface.htm"
|
|
},
|
|
"IfcReferencesValueDocument": {
|
|
"attributes": {
|
|
"Description": "A description of the relationship to the document from which values may be referenced.",
|
|
"Name": "A name used to identify or qualify the relationship to the document from which values may be referenced..",
|
|
"ReferencedDocument": "A document such as a price list or quotation from which costs are obtained.",
|
|
"ReferencingValues": "Costs obtained from a single document such as a price list or quotation."
|
|
},
|
|
"description": "An IfcReferencesValueDocument is a means of referencing many instances of IfcAppliedValue to a single document where the document is a price list, quotation, list of environmental impact values or other source of information. Use Definitions The purpose of this class is to be able to identify a reference source from which applied values are obtained. Since many objects may be obtain such values from the same referenced document, use of a relationship class allows the document to be identified once only when information is exchanged or shared rather than many times.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccostresource/lexical/ifcreferencesvaluedocument.htm"
|
|
},
|
|
"IfcRegularTimeSeries": {
|
|
"attributes": {
|
|
"TimeStep": "A duration of time intervals between values.",
|
|
"Values": "The collection of time series values."
|
|
},
|
|
"description": "In a regular time series, the data arrives predictably at predefined intervals. In a regular time series there is no need to store multiple time stamps and the algorithms for analyzing the time series are therefore significantly simpler. Using the start time provided in the supertype, the time step is used to identify the frequency of the occurrences of the list of values.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctimeseriesresource/lexical/ifcregulartimeseries.htm"
|
|
},
|
|
"IfcReinforcementBarProperties": {
|
|
"attributes": {
|
|
"BarCount": "The number of bars with identical nominal diameter and steel grade included in the specific reinforcement configuration.",
|
|
"BarSurface": "Indicator for whether the bar surface is plain or textured.",
|
|
"EffectiveDepth": "The effective depth, i.e. the distance of the specific reinforcement cross section area or reinforcement configuration in a row, counted from a common specific reference point. Usually the reference point is the upper surface (for beams and slabs) or a similar projection in a plane (for columns).",
|
|
"NominalBarDiameter": "The nominal diameter defining the cross-section size of the reinforcing bar. The bar diameter should be identical for all bars included in the specific reinforcement configuration.",
|
|
"SteelGrade": "The nominal steel grade defined according to local standards.",
|
|
"TotalCrossSectionArea": "The total effective cross-section area of the reinforcement of a specific steel grade."
|
|
},
|
|
"description": "An IfcReinforcementProperties defines the set of properties for a specific combination of reinforcement bar steel grade, bar type and effective depth. General usage: The total cross section area for the specific steel grade is always provided. Additionally also general reinforcing bar configurations as a count of bars may be provided as defined in attribute BarCount. In this case the nominal bar diameter should be identical for all given bars as defined in attribute NominalBarDiameter.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofilepropertyresource/lexical/ifcreinforcementbarproperties.htm"
|
|
},
|
|
"IfcReinforcementDefinitionProperties": {
|
|
"attributes": {
|
|
"DefinitionType": "Descriptive type name applied to reinforcement definition properties.",
|
|
"ReinforcementSectionDefinitions": "The list of section reinforcement properties attached to the reinforcement definition properties."
|
|
},
|
|
"description": "An IfcReinforcementDefinitionProperties defines the cross section properties of reinforcement included in reinforced concrete building elements. The property set definition may be used both in conjunction with insitu and precast structures. General usage: This subtype of IfcPropertySetDefinition is used to define the reinforcement properties in early design stages, such as in requirement definition or scheme design. In later design stages explicit instances of subtypes of IfcReinforcingElement are used. The intended usage may be indicated using the DefinitionType attribute value as a designator: recommended values are 'Reinforcement area requirement' or 'Reinforcement configuration requirement'. Other values may be used according to local standards. Only one property set definition of this kind is used for each concrete building element in each intended usage indicated by the DefinitionType attribute value. This set then defines a list of cross section properties in a discrete number of longitudinal sections as instances of IfcSectionReinforcementProperties (one for each structural reinforcement bar role), which in turn have a section cross section property defined as a profile and a number of reinforcement properties, one for each steel grade / bar type.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifcreinforcementdefinitionproperties.htm"
|
|
},
|
|
"IfcReinforcingBar": {
|
|
"attributes": {
|
|
"BarLength": "The total length of the reinforcing bar. The total length of bended bars are calculated according to local standards with corrections for the bends.",
|
|
"BarRole": "The role, purpose or usage of the bar, i.e. the kind of loads and stresses it is intended to carry.",
|
|
"BarSurface": "Indicator for whether the bar surface is plain or textured.",
|
|
"CrossSectionArea": "The effective cross-section area of the reinforcing bar.",
|
|
"NominalDiameter": "The nominal diameter defining the cross-section size of the reinforcing bar."
|
|
},
|
|
"description": "A steel bar, usually with manufactured deformations in the surface, used in concrete and masonry construction to provide additional strength. *Property Set Use Definition*: The property sets relating to the IfcReinforcingBar are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcReinforcingBar are part of this IFC release: - Pset_ReinforcingBarBendingsBECCommon: common property set for all IfcReinforcingBar occurrences for bending information according to the Finnish BEC-standard. - Pset_ReinforcingBarBendingsBS8666Common: common property set for all IfcReinforcingBar occurrences for bending information according to the BS8666 standard. - Pset_ReinforcingBarBendingsDIN135610Common: common property set for all IfcReinforcingBar occurrences for bending information according to the DIN 1356-10 standard. - Pset_ReinforcingBarBendingsISOCD3766Common: common property set for all IfcReinforcingBar occurrences for bending information according to the ISO CD 3766 standard. Geometry Use Definitions: The geometric representation of IfcReinforcingBar is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcBuildingElementComponent. Standard Geometric Representation using Swept Solid Representation The standard geometric representation of IfcReinforcingBar is defined using the swept solid representation. The RepresentationType attribute of IfcShapeRepresentation should have the value 'SweptSolid'. The solid is formed from a cross section approximated as a circular disk swept along any arbitrary curve. Given this, the following constraints apply to the standard representation: - Solid: IfcSweptDiskSolid introduced in IFC Release 2x2 shall be supported. - Profile: The circular disk cross section approximation is defined by the Radius attribute of IfcSweptDiskSolid. - Extrusion: The extrusion along any arbitrary curve is defined by the Directrix attribute of IfcSweptDiskSolid. Simplified Geometric Representation Simplified geometric representations may be used based on local agreements.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifcreinforcingbar.htm"
|
|
},
|
|
"IfcReinforcingElement": {
|
|
"attributes": {
|
|
"SteelGrade": "The nominal steel grade defined according to local standards."
|
|
},
|
|
"description": "Bars, wires, strands, and other slender members embedded in concrete in such a manner that the reinforcement and the concrete act together in resisting forces. Geometry Use Definitions: The geometric representation of IfcReinforcingElement is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcBuildingElementComponent. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcBuildingElementComponent. Further constraints on the geometric representation may be defined in subtypes.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifcreinforcingelement.htm"
|
|
},
|
|
"IfcReinforcingMesh": {
|
|
"attributes": {
|
|
"LongitudinalBarCrossSectionArea": "The effective cross-section area of the longitudinal bars of the mesh.",
|
|
"LongitudinalBarNominalDiameter": "The nominal diameter denoting the cross-section size of the longitudinal bars.",
|
|
"LongitudinalBarSpacing": "The spacing between the longitudinal bars. Note: an even distribution of bars is presumed; other cases are handled by Psets.",
|
|
"MeshLength": "The overall length of the mesh measured in its longitudinal direction.",
|
|
"MeshWidth": "The overall width of the mesh measured in its transversal direction.",
|
|
"TransverseBarCrossSectionArea": "The effective cross-section area of the transverse bars of the mesh.",
|
|
"TransverseBarNominalDiameter": "The nominal diameter denoting the cross-section size of the transverse bars.",
|
|
"TransverseBarSpacing": "The spacing between the transverse bars. Note: an even distribution of bars is presumed; other cases are handled by Psets."
|
|
},
|
|
"description": "A series of longitudinal and transverse wires or bars of various gauges, arranged at right angles to each other and welded at all points of intersection; usually used for concrete slab reinforcement. Also known as welded wire fabric. *Property Set Use Definition*: The property sets relating to the IfcReinforcingMesh are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcReinforcingMesh are part of this IFC release: - Pset_ReinforcingBarBendingsBECCommon: common property set for all IfcReinforcingMesh occurrences for bending information according to the Finnish BEC-standard. Geometry Use Definitions: The geometric representation of IfcReinforcinMesh is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined in the supertype IfcBuildingElementComponent. Standard Geometric Representation The use of Standard Geometric Representations is defined in the supertype IfcBuildingElementComponent.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifcreinforcingmesh.htm"
|
|
},
|
|
"IfcRelAggregates": {
|
|
"description": "The aggregation relationship IfcRelAggregates is a special type of the general composition/decomposition (or whole/part) relationship IfcRelDecomposes. The aggregation relationship can be applied to all subtypes of object. Some further specializations of decomposition may imply additional constraints and meanings, such as the requirement of aggregates to represent physical containment. In cases of physical containment the representation (within the same representation context) of the whole can be taken from the sum of the representations of the parts. Decompositions imply a dependency, i.e. the definition of the whole depends on the definition of the parts and the parts depend on the existence of the whole. The behavior that is implied from the dependency has to be established inside the applications.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelaggregates.htm"
|
|
},
|
|
"IfcRelAssigns": {
|
|
"attributes": {
|
|
"RelatedObjects": "Related objects, which are assigned to a single object. The type of the single (or relating) object is defined in the subtypes of IfcRelAssigns.",
|
|
"RelatedObjectsType": "Particular type of the assignment relationship. It can constrain the applicable object types, used within the role of RelatedObjects."
|
|
},
|
|
"description": "The assignment relationship, IfcRelAssigns, is a generalization of \"link\" relationships among instances of IfcObject and its various 1^st^ level subtypes. A link denotes the specific association through which one object (the client) applies the services of other objects (the suppliers), or through which one object may navigate to other objects. The client is denoted as the relating object and is established at the level of the specific, instantiable subtypes of IfcRelAssigns. The suppliers are denoted as the related objects and they are established by the RelatedObjects attribute. The assignment relationship establishs a bi-directional relationship among the participating objects and does not imply any dependency. The subtypes of IfcRelAssigns establishes the particular semantic meaning of the assignment relationship.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassigns.htm"
|
|
},
|
|
"IfcRelAssignsTasks": {
|
|
"attributes": {
|
|
"TimeForTask": "Contained object for the time related information for the work schedule element."
|
|
},
|
|
"description": "An IfcRelAssignsTasks is a relationship class that assigns an IfcTask to an IfcWorkControl. The assignment is further qualified by attaching an IfcScheduleTimeControl to the assignment to give the time constraints of the work task, when assigned to a work plan or schedule. Use Definitions The inherited attributes have the following meaning: - SELF\\IfcRelAssigns.RelatedObjects - is the reference to the related IfcTask, which is assigned to the work control. The task gets the time information from the reference to the IfcScheduleTimeControl. - SELF\\IfcRelAssignsToControl.RelatingControl - is the reference to the relating IfcWorkControl (either a work plan or a work schedule) which gets a task assigned. Each task in a work schedule may have a set of associated time criteria that define information about when the task should be completed. This time information is separated from the the actual work task into the IfcScheduleTimeControl class. Where the work schedule requires that the task and the time control are brought together, this is achieved through the use of the IfcRelAssignsTask class.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprocessextension/lexical/ifcrelassignstasks.htm"
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},
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"IfcRelAssignsToActor": {
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"attributes": {
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"ActingRole": "Role of the actor played within the context of the assignment to the object(s).",
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"RelatingActor": "Reference to the information about the actor. It comprises the information about the person or organization and its addresses."
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},
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"description": "This objectified relationship (IfcRelAssignsToActor) handles the assignment of objects (subtypes of IfcObject) to an actor (subtypes of IfcActor). The IfcRelAssignsToActor objectified relationship defines a relationship between an IfcActor and one or many objects. An particular role of the actor played in that relationship can be associated. If specified, it takes priority over the role that may be directly assigned to the person or organization. Reference to the objects (or single object) on which the actor acts upon in a certain role (if given) is specified in the inherited RelatedObjects attribute.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassignstoactor.htm"
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},
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"IfcRelAssignsToControl": {
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"attributes": {
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"RelatingControl": "Reference to the control that applies an control about objects."
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},
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"description": "This objectified relationship (IfcRelAssignsToControl) handles the assignment of a control (subtype of IfcControl) to other objects (subtypes of IfcObject, with the exception of controls).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassignstocontrol.htm"
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},
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"IfcRelAssignsToGroup": {
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"attributes": {
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"RelatingGroup": "Reference to group that finally contains all assigned group members."
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},
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"description": "This objectified relationship (IfcRelAssignsToGroup) handles the assignment of objects (subtypes of IfcObject) to a group (subtypes of IfcGroup). The relationship handles the assignment of group members to the group object. It allows for grouping arbitrary objects within a group, including other groups. The grouping relationship can be applied in a recursive manner. The resulting group is of type IfcGroup. The Purpose attribute defined at the supertype IfcReleationship, may assign a descriptor, that defines the purpose of the group. The inherited attribute RelatedObjects gives the references to the objects, which are the elements within the group. The RelatingGroup is the group, that comprises all elements. Informal proposition: - The group assignment relationship shall be a-cyclic, i.e. a group should not participate in its own grouping relationship.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassignstogroup.htm"
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},
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"IfcRelAssignsToProcess": {
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"attributes": {
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"QuantityInProcess": "Quantity of the object specific for the operation by this process.",
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"RelatingProcess": "Reference to the process to which the objects are assigned to."
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},
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"description": "This objectified relationship (IfcRelAssignsToProcess) handles the assignment of an object as an item the process operates on. Process is related to the product that it operate on (normally as input or output) through this relationship. Processes can operate on things other than products, and can operate in ways other than input and output. The inherited attribute RelatedObjects gives the references to the objects, which the process operates on. The RelatingProcess is the process, that operates on the object. The operation types are captured in the inherited attribute Name.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassignstoprocess.htm"
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},
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"IfcRelAssignsToProduct": {
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"attributes": {
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"RelatingProduct": "Reference to the Product to which the objects are assigned to."
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},
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"description": "This objectified relationship IfcRelAssignsToProduct handles the assignment of objects (subtypes of IfcObject) to a product (subtypes of IfcProduct). The Name attribute should be used to classify the usage of the IfcRelAssignsToProduct objectified relationship. The following Name values are proposed: - 'Reference' : Assignment of a product (via RelatingProduct) to a spatial structure (via RelatedObjects) to which it is referenced (in contrary to being contained - which is handled by IfcRelContainedInSpatialStructure). - 'Context' : Assignment of a context specific representation, such as of structural members to a different context representation (with potentially different decomposition breakdown) such as of building elements for a specific context specific representation. - 'View' : Assignment of a product (via RelatingProduct) that is decomposed according to a discipline view, to another product (via RelatedObjects) that is decomposed according to a different discipline view. An example is the assignment of the architectural slab to a different decomposition of the pre manufactured sections of a slab (under a precast concrete discipline view).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassignstoproduct.htm"
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},
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"IfcRelAssignsToProjectOrder": {
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"description": "An IfcRelAssignsToProjectOrder is a relationship class that captures the incidence of a project order for a set of objects and whose occurrences can be recorded within a project record in sequence as a series of events. IfcRelAssignsToProjectOrder is a subtype of IfcRelAssignsToControl. It acts so as to assign items to a project order. The instance of IfcProjectOrder acts as the relating control (which is inherited from IfcRelAssignsToControl). Specific objects may be assigned to the project order via the inherited IfcRelAssignsToControl.RelatedObjects attribute. Examples are a cost schedule (IfcCostSchedule), a work plan (IfcWorkPlan), actors concerned with the project order (IfcActor) etc. It may also be relevant to assign physical components to the order to identify that this is the originating order for such objects. This can be particularly relevant in the operating phase of the facility lifecycle where the Facilities Manager may wish to obtain details about the original purchase of components. It is more efficient to achieve this through assigning the objects to the project order through IfcRelAssignsToProjectOrder rather than assigning the project order to each object through multiple instances of IfcRelAssignsToProduct.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedmgmtelements/lexical/ifcrelassignstoprojectorder.htm"
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},
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"IfcRelAssignsToResource": {
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"attributes": {
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"RelatingResource": "Reference to the resource to which the objects are assigned to."
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},
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"description": "This objectified relationship (IfcRelAssignsToResource) handles the assignment of objects (subtypes of IfcObject) to a resource (subtypes of IfcResource).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassignstoresource.htm"
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},
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"IfcRelAssociates": {
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"attributes": {
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"RelatedObjects": "Objects or Types, to which the external references or information is associated."
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},
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"description": "The association relationship (IfcRelAssociates) refer to external sources of information (most notably a classification, library or document). There is no dependency implied by the association. Association relationships can the established to objects (occurrences) or to types (both object types, IfcTypeObject, or partial types, IfcPropertySetDefinition). The association relationship establishs a uni-directional association. The subtypes of IfcRelAssociates establishes the particular semantic meaning of the association relationship.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassociates.htm"
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},
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"IfcRelAssociatesAppliedValue": {
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"attributes": {
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"RelatingAppliedValue": ""
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},
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"description": "An IfcRelAssociatesAppliedValue is a subtype of IfcRelAssociates that enables the association of an instance of IfcAppliedValue with one or more instances of IfcObject. Because IfcRelAssociatesAppliedValue is a subtype of IfcRelAssociates, this means that a single instance of IfcCostValue or IfcEnvironmentalImpactValue can be related to many objects of whatever type (product, process, resource etc.) Note that IfcRelAssociatesAppliedValue, when used for costing purposes, should be used only for relating specific cost values to objects and not for relating cost schedule items to cost schedule (for which purpose IfcRelSchedulesCostItems should be used).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedmgmtelements/lexical/ifcrelassociatesappliedvalue.htm"
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},
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"IfcRelAssociatesApproval": {
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"attributes": {
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"RelatingApproval": "Reference to approval that is being applied using this relationship."
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},
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"description": "The entity IfcRelAssociatesApproval is used to apply approval information defined by IfcApproval, in IfcApprovalResource schema, to all subtypes of IfcRoot.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccontrolextension/lexical/ifcrelassociatesapproval.htm"
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},
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"IfcRelAssociatesClassification": {
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"attributes": {
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"RelatingClassification": "Classification applied to the objects."
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},
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"description": "This objectified relationship (IfcRelAssociatesClassification) handles the assignment of a classification object (items of the select IfcClassificationSelect) to objects (subtypes of IfcObject). The relationship is used to assign a classification notation or a classification reference to objects. A single notation can be applied to multiple objects. Depending on the type of the RelatingClassification, either a reference to a fully described classification system can be made, or just a reference using the classification code. The inherited attribute RelatedObjects define the objects to which the classification is applied. The attribute RelatingClassification is the reference to a classification, applied to the object(s).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassociatesclassification.htm"
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},
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"IfcRelAssociatesConstraint": {
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"attributes": {
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"Intent": "The intent of the constraint usage with regard to its related IfcConstraint and IfcObjects, IfcPropertyDefinitions or IfcRelationships. Typical values can be e.g. RATIONALE or EXPECTED PERFORMANCE.",
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"RelatingConstraint": "Reference to constraint that is being applied using this relationship."
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},
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"description": "The entity IfcRelAssociatesConstraint is used to apply constraint information defined by IfcConstraint, in IfcConstraintResource schema, to all subtypes of IfcRoot.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccontrolextension/lexical/ifcrelassociatesconstraint.htm"
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},
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"IfcRelAssociatesDocument": {
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"attributes": {
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"RelatingDocument": "Document information or reference which is applied to the objects."
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},
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"description": "This objectified relationship (IfcRelAssociatesDocument) handles the assignment of a document information (items of the select IfcDocumentSelect) to objects (subtypes of IfcObject). The relationship is used to assign a document reference or a more detailed document information to objects. A single document reference can be applied to multiple objects. The inherited attribute RelatedObjects define the objects to which the document association is applied. The attribute RelatingDocument is the reference to a document reference, applied to the object(s).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassociatesdocument.htm"
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},
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"IfcRelAssociatesLibrary": {
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"attributes": {
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"RelatingLibrary": "Reference to a library, from which the definition of the property set is taken."
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},
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"description": "This objectified relationship (IfcRelAssociatesLibrary) handles the assignment of a library item (items of the select IfcLibrarySelect) to objects (subtypes of IfcObject). The relationship is used to assign a library reference or a more detailed link to a library information to objects, property sets or types. A single library reference can be applied to multiple items. The inherited attribute RelatedObjects define the items to which the library association is applied. The attribute RelatingLibrary is the reference to a library reference, applied to the item(s).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassociateslibrary.htm"
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},
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"IfcRelAssociatesMaterial": {
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"attributes": {
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"RelatingMaterial": "Material definition (either a single material, a list of materials, or a set of material layers) assigned to the elements."
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},
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"description": "Objectified relationship between a material definition and elements or element types to which this material definition applies. The material definition can be: - A single material - A material list, e.g. for composite elements - A material layer set, for layered elements with an indication of the layering direction and individual layer thicknesses - A material layer set usage, i.e. a material layer set with positioning information along the reference axis or surface of the element. The IfcRelAssociatesMaterial relationship is a special type of the IfcRelAssociates relationship. It can be applied to subtypes of IfcElement and subtypes of IfcElementType. - The IfcElement has an inverse relation to its material definition by the HasAssociations attribute, inherited from IfcObject. - The IfcElementType has an inverse relation to its material definition by the HasAssociations attribute, inherited from IfcPropertyDefinition. If both, the element occurrence (by an instance of IfcElement) and the element type (by an instance of IfcElementType, connected through IfcRelDefinesByType) have an associated material, then the material associated to the element occurrence overrides the material associated to the element type. Informal proposition - An IfcMaterialLayerSetUsage shall not be associated with a subtype of IfcElementType, it should only be associated with individual occurrences",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelassociatesmaterial.htm"
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},
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"IfcRelAssociatesProfileProperties": {
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"attributes": {
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"ProfileOrientation": "The provision of an plane angle or a direction as the measure to orient the profile definition within the elements coordinate system. * For _IfcStructuralCurveMember_ the _IfcPlaneAngleMeasure_ defines the \u03b2 angle, for columns the derivation from the structural x axis and for beams the derivation from the structural z axis. The _IfcDirection_ precisely defines the orientation of the profile's structural z axis within the structural coordinate system of the analysis model.",
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"ProfileSectionLocation": "Reference to a shape aspect with a single member of the ShapeRepresentations list. This member holds the location at which the profile properties apply.",
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"RelatingProfileProperties": "Profile property definition assigned to the instances."
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},
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"description": "Definition from IAI: The IfcRelAssociatesProfileProperties is an objectified relationship between non geometric profile properties (subtypes of IfcProfileProperties) and elements to which these properties apply, e.g. building elements and building element types as used within the structural engineering domain for steel, timber or concrete structures. If the ProfileSectionLocation attribute is given, it points to a shape aspect of the geometric or topological representation of the structural member. This allows the assignment of several profile properties (by many instances of IfcRelAssociatesProfileProperties) to accommodate varying profiles and members with different profile sections. If the ProfileOrientation attribute is given, it provides an orientation of the profile. - For IfcStructuralCurveMember it is a rotation about the longitudinal axis of the underlying curve, the x axis is determined by a line from the start vertex to the end vertex. If the longitudinal axis is not parallel to the structural z axis of the structural coordinate system of the analysis model, i.e. the curve member is a beam (or non-vertical member), the ProfileOrientation defaults to [0.,0.,1.] (if the z axis is not orthogonal to the x axis, an adjustment is made to maintain orthogonality, see function IfcBuildAxes for an algorithm). The \u03b2 angle is then measured from the structural z axis to determine the location of the structural z axis of the profile. If the longitudinal axis is parallel to the structural z axis of the structural coordinate system of the analysis model, i.e. the curve member is a column, the ProfileOrientation defaults to [1.,0.,0.]. The \u03b2 angle is then measured from the structural x axis to determine the location of the structural z axis of the profile. - If the ProfileOrientation attribute is given as an IfcDirection, it would default to: For 'beams' as [0., sin\u03b2, cos\u03b2 ] For 'columns' as [cos\u03b2, -sin\u03b2, 0.]",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcrelassociatesprofileproperties.htm"
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},
|
|
"IfcRelConnects": {
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"description": "A connectivity relationship (IfcRelConnects) that connects objects under some criteria. As a general connectivity it does not imply constraints, however subtypes of the relationship define the applicable object types for the connectivity relationship and the semantics of the particular connectivity.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelconnects.htm"
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},
|
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"IfcRelConnectsElements": {
|
|
"attributes": {
|
|
"ConnectionGeometry": "Relationship to the control class, that provides the geometrical constraints of the connection.",
|
|
"RelatedElement": "Reference to an Element that is connected by the objectified relationship.",
|
|
"RelatingElement": "Reference to an Element that is connected by the objectified relationship."
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|
},
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"description": "The IfcRelConnectsElements objectified relationship provides the generalization of the connectivity between elements. It is a 1 to 1 relationship. The concept of two elements being physically or logically connected is described independently from the connecting elements. The connectivity may be related to the shape representation of the connected entities by providing a connection geometry. - In this case the geometrical constraints of the connection are provided by the optional relationship to the IfcConnectionGeometry. The connection geometry is provided as a point, curve or surface within the local placement coordinate systems of the connecting elements. - If the connection geometry is omitted then the connection is provided as a logical connection. Under this circumstance, the connection point, curve or surface has to be recalculated by the receiving application.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelconnectselements.htm"
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},
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|
"IfcRelConnectsPathElements": {
|
|
"attributes": {
|
|
"RelatedConnectionType": "Indication of the connection type in relation to the path of the RelatingObject.",
|
|
"RelatedPriorities": "Priorities for connection. It refers to the layers of the RelatedObject.",
|
|
"RelatingConnectionType": "Indication of the connection type in relation to the path of the RelatingObject.",
|
|
"RelatingPriorities": "Priorities for connection. It refers to the layers of the RelatingObject."
|
|
},
|
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"description": "The IfcRelConnectsPathElements relationship provides the connectivity information between two elements, which have a path information. Currently it is applied to IfcWall and IfcWallStandardCase. The objectified relationship provides all additional information required to describe the connection between two path based elements that might have single or multiple layers of material. The connection type specifies where at the path based element a connection is given (at the start, in the middle or at the end). Illustration: The following figure shows the application of IfcRelConnectsPathElements with the ConnectionGeometry of type IfcConnectionCurveGeometry.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcrelconnectspathelements.htm"
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|
},
|
|
"IfcRelConnectsPortToElement": {
|
|
"attributes": {
|
|
"RelatedElement": "Reference to an Element that is connected by the objectified relationship.",
|
|
"RelatingPort": "Reference to an Port that is connected by the objectified relationship."
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|
},
|
|
"description": "An IfcRelConnectsPortToElement defines the relationship that is made between a port and the IfcElement in which it is contained. It is a 1 to 1 relationship. Ports contained in different elements are connected to each other using the IfcRelConnectsPorts relationship. Using both relationships, a topological system can be defined.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelconnectsporttoelement.htm"
|
|
},
|
|
"IfcRelConnectsPorts": {
|
|
"attributes": {
|
|
"RealizingElement": "Defines the element that realizes a port connection relationship.",
|
|
"RelatedPort": "Reference to the second port that is connected by the objectified relationship.",
|
|
"RelatingPort": "Reference to the first port that is connected by the objectified relationship."
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|
},
|
|
"description": "An IfcRelConnectsPorts defines the relationship that is made between two ports at their point of connection. It may include the connection geometry between two ports. IfcRelConnectsPorts is required for defining how instances of IfcPort connect together. Each of the port is being logically attached to the IfcElement by using the IfcRelConnectsPortToElement relationship.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelconnectsports.htm"
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|
},
|
|
"IfcRelConnectsStructuralActivity": {
|
|
"attributes": {
|
|
"RelatedStructuralActivity": "Reference to an instance of IfcStructuralActivity (or its subclasses) which is acting upon the specified structural element (represented by a respective structural representation entity).",
|
|
"RelatingElement": "Reference to an instance of IfcStructuralItem or IfcBuildingElement (or its subclasses) to which the specified action is applied."
|
|
},
|
|
"description": "The IfcRelConnectsStructuralActivity relationship connects a structural activity (either an action or reaction) to a structural member or a building element.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcrelconnectsstructuralactivity.htm"
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|
},
|
|
"IfcRelConnectsStructuralElement": {
|
|
"attributes": {
|
|
"RelatedStructuralMember": "The structural member that is associated with the element of which it represents the analytical idealization.",
|
|
"RelatingElement": "The physical element, representing a design or detailing part, that is connected to the structural member as its (partial) analytical idealization."
|
|
},
|
|
"description": "The one-to-one relationship assigns a structural member (as instance of IfcStructuralMember or its subclasses) to a physical element (as instance of IfcElement or its subclasses) to keep the association between the design or detailing element and the structural analysis element. Both, the IfcElement and the IfcStructuralMember, may involve any number (zero, one, or many) associations between physical and analytical element. Multiple instances of IfcRelConnectsStructuralElement can therefore be used to reflect the many-to-many nature of the association between physical and analytical elements.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcrelconnectsstructuralelement.htm"
|
|
},
|
|
"IfcRelConnectsStructuralMember": {
|
|
"attributes": {
|
|
"AdditionalConditions": "Reference to instances describing additional connection properties.",
|
|
"AppliedCondition": "Reference to an instance of _IfcBoundaryCondition_ which is used to define the connections properties. > NOTE The boundary condition applied to a member-connection-relationship is also called \"release\"",
|
|
"ConditionCoordinateSystem": "Defines a new coordinate system used for the description of the connection properties. The usage of this coordinate system is described more detailed in the definition of the subtypes of this entity definition.",
|
|
"RelatedStructuralConnection": "Reference to an instance of IfcStructuralConnection (or its subclasses) which is connected to the specified structural member.",
|
|
"RelatingStructuralMember": "Reference to an instance of IfcStructuralMember (or its subclasses) which is connected to the specified structural connection.",
|
|
"SupportedLength": "Defines the 'supported length' of this structural connection. See Fig. for more detail."
|
|
},
|
|
"description": "The entity IfcRelConnectsStructuralMember defines all needed properties describing the connection between structural members and structural connections (nodes or supports). Use Definition Point Connection Instances of the entity IfcRelConnectsStructuralMember shall be used to describe a connection between an instance of IfcStructuralPointConnection and either an instance of IfcStructuralCurveMember or IfcStructuralSurfaceMember. The RelatedStructuralConnection for point connections has to be of type = 'IfcStructuralPointConnection'. Curve Connection Instances of the entity IfcRelConnectsStructuralMember shall be used to describe a connection between an instance of IfcStructuralCurveConnection and an instance of either IfcStructuralCurveMember or IfcStructuralSurfaceMember. The RelatedStructuralConnection for curve connections has to be of type = 'IfcStructuralCurveConnection'. Surface Connection Instances of the entity IfcRelConnectsStructuralMember shall be used to describe a connection between an instance of IfcStructuralSurfaceConnection and an instance of IfcStructuralSurfaceMember (or an instance of a volumetric member, if defined in future extensions). The RelatedStructuralConnection for curve connections has to be of type = 'IfcStructuralSurfaceConnection'. Coordinate System for Applied Conditions All values defined by AppliedCondition or AdditionalConditions are given within the coordinate system provided by ConditionCoordinateSystem, which is defined in relation to the local coordinate system of the structural member. If the ConditionCoordinateSystem is not defined, the local placement of the structural member is used instead. Supported Length Optionally a supported length can be given, which gives the length (or width) of the physical connection along a curve connection.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcrelconnectsstructuralmember.htm"
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|
},
|
|
"IfcRelConnectsWithEccentricity": {
|
|
"attributes": {
|
|
"ConnectionConstraint": "The connection constraint explicitly states the eccentricity between a structural element and a structural connection, either given by two point (used to calculate the eccentricity), or by explicit x, y, and z offsets."
|
|
},
|
|
"description": "The entity IfcRelConnectsWithEccentricity adds the definition of eccentricity to the connection between a structural member and a structural connection (representing either a node or support). Use Definition Point Connection Instances of the entity IfcRelConnectsWithEccentricity_shall be used to describe a connection with eccentricity between an instance of _IfcStructuralPointConnection and an instance of IfcStructuralCurveMember or IfcStructuralSurfaceMember. The RelatedStructuralConnection for point connections therefore has to be of type'IfcStructuralPointConnection'. The eccentricity is defined by a connection constraint being of type 'IfcConnectionPointGeometry', or by its subtype 'IfcConnectionPointEccentricity'. It refers to the IfcVertexPoint, used by the IfcStructuralCurveMember, or IfcStructuralSurfaceMember, that is used in this connection, and optionally to the IfcVertexPoint, used by the IfcStructuralPointConnection. In addition the eccentricity can be given by x, y, and z distance values.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcrelconnectswitheccentricity.htm"
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|
},
|
|
"IfcRelConnectsWithRealizingElements": {
|
|
"attributes": {
|
|
"ConnectionType": "The type of the connection given for informal purposes, it may include labels, like 'joint', 'rigid joint', 'flexible joint', etc.",
|
|
"RealizingElements": "Defines the elements that realize a connection relationship."
|
|
},
|
|
"description": "IfcRelConnectsWithRealizingElements defines a generic relationship that is made between two elements that require the realization of that relationship by means of further realizing elements. An IfcRelConnectsWithRealizingElements is a specialization of IfcRelConnectsElement where the connecting operation has the additional attribute of (one or many) realizing elements that may be used to realize or further qualify the relationship. It is defined as a ternary relationship.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelconnectswithrealizingelements.htm"
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|
},
|
|
"IfcRelContainedInSpatialStructure": {
|
|
"attributes": {
|
|
"RelatedElements": "Set of ~~elements~~ products, which are contained within this level of the spatial structure hierarchy.",
|
|
"RelatingStructure": "Spatial structure element, within which the element is contained. Any element can only be contained within one element of the project spatial structure."
|
|
},
|
|
"description": "This objectified relationship, IfcRelContainedInSpatialStructure, is used to assign elements to a certain level of the spatial project structure. Any element can only be assigned once to a certain level of the spatial structure. The question, which level is relevant for which type of element, can only be answered within the context of a particular project and might vary within the various regions. The containment relationship of an element within a spatial structure has to be a hierarchical relationship, an element can only be contained within a single spatial structure element. The reference relationship between an element and the spatial structure may not be hierarchical, i.e. an element can reference many spatial structure elements. Predefined spatial structure elements to which elements can be assigned are - site as IfcSite - building as IfcBuilding - storey as IfcBuildingStorey - space as IfcSpace Occurrences of the same element type can be assigned to different spatial structure elements depending on the context of the occurrence. *Containment Use Definition*:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelcontainedinspatialstructure.htm"
|
|
},
|
|
"IfcRelCoversBldgElements": {
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|
"attributes": {
|
|
"RelatedCoverings": "Relationship to the set of coverings at this element.",
|
|
"RelatingBuildingElement": "Relationship to the element that is covered."
|
|
},
|
|
"description": "The IfcRelCoversBldgElements is an objectified relationship between an element and one to many coverings, which cover the building element. Coverings may be defined primarily as coverings of elements, like an isolation covers a pipe, or as coverings of spaces, as a cladding is often referred to as a space finish. - IfcRelCoversBldgElements, this relationship, expresses the primary relation to the element, - IfcRelCoversSpaces expresses the primary relation to the space.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelcoversbldgelements.htm"
|
|
},
|
|
"IfcRelCoversSpaces": {
|
|
"attributes": {
|
|
"RelatedCoverings": "Relationship to the set of coverings covering this space.",
|
|
"RelatedSpace": "Relationship to the space object that is covered."
|
|
},
|
|
"description": "The objectified relationship, IfcRelCoversSpace, relates a space object to one or many coverings, which faces (or is assigned to) the space. The IFC specification provides two relationships: - IfcRelCoversBldgElements to assign coverings to elements, and - IfcRelCoversSpaces to assign coverings to spaces Which relationship should be applied has to be determined by the context of the project or application .",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelcoversspaces.htm"
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|
},
|
|
"IfcRelDecomposes": {
|
|
"attributes": {
|
|
"RelatedObjects": "The objects being nested or aggregated.",
|
|
"RelatingObject": "The object that represents the nest or aggregation."
|
|
},
|
|
"description": "The decomposition relationship, IfcRelDecomposes, defines the general concept of elements being composed or decomposed. The decomposition relationship denotes a whole/part hierarchy with the ability to navigate from the whole (the composition) to the parts and vice versa. Decompositions may be constraint by requiring both, the whole and its parts, to be of the same type - thus establishing a nesting relationship. Or they may require some form of physical containment, thus establishing special types of aggregation relationships. Decompositions imply a dependency, i.e. the definition of the whole depends on the definition of the parts and the parts depend on the existence of the whole. The decomposition relationship can be applied in a recursive manner, i.e. a decomposed element can be part in another decomposition. Cyclic references have to be prevented at application level.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcreldecomposes.htm"
|
|
},
|
|
"IfcRelDefines": {
|
|
"attributes": {
|
|
"RelatedObjects": "Reference to the objects (or single object) to which the property definition applies."
|
|
},
|
|
"description": "A definition relationship (IfcRelDefines) that uses a type definition or property set definition (seens as partial type information) to define the properties of the object instance. It is a specific - occurrence relationship with implied dependencies (as the occurrence properties depend on the specific properties). The IfcRelDefines relationship establishes the link between one type (specific) information and several objects (occurrences). Those occurrences then share the same type (or partial type) information.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcreldefines.htm"
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|
},
|
|
"IfcRelDefinesByProperties": {
|
|
"attributes": {
|
|
"RelatingPropertyDefinition": "Reference to the property set definition for that object or set of objects."
|
|
},
|
|
"description": "This objectified relationship (IfcRelDefinesByProperties) defines the relationships between property set definitions and objects. Properties are aggregated in property sets, property sets can be grouped to define an object type. The IfcRelDefinesByProperties is a 1-to-N relationship, as it allows for the assignment of one property set to a single or to many objects. Those objects then share the same property definition.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcreldefinesbyproperties.htm"
|
|
},
|
|
"IfcRelDefinesByType": {
|
|
"attributes": {
|
|
"RelatingType": "Reference to the type (or style) information for that object or set of objects."
|
|
},
|
|
"description": "This objectified relationship (IfcRelDefinesByType) defines the relationships between an object type and objects. The IfcRelDefinesByType is a 1-to-N relationship, as it allows for the assignment of one type information to a single or to many objects. Those objects then share the same object type.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcreldefinesbytype.htm"
|
|
},
|
|
"IfcRelFillsElement": {
|
|
"attributes": {
|
|
"RelatedBuildingElement": "Reference to ~~building~~ element that occupies fully or partially the associated opening.",
|
|
"RelatingOpeningElement": "Opening Element being filled by virtue of this relationship."
|
|
},
|
|
"description": "Objectified relationship between an opening element and an ~~building~~ element that fills (or partially fills) the opening element. It is an one-to-one relationship.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelfillselement.htm"
|
|
},
|
|
"IfcRelFlowControlElements": {
|
|
"attributes": {
|
|
"RelatedControlElements": "References control elements which may be used to impart control on the Distribution Element.",
|
|
"RelatingFlowElement": "Relationship to a distribution flow element"
|
|
},
|
|
"description": "Objectified relationship between a distribution flow element occurrence instance and one-to-many control element occurrence instances. Currently it is applied to IfcDistributionFlowelEment and IfcDistributionControlElement.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcrelflowcontrolelements.htm"
|
|
},
|
|
"IfcRelInteractionRequirements": {
|
|
"attributes": {
|
|
"DailyInteraction": "Number of interactions occurring on a daily basis.",
|
|
"ImportanceRating": "Represents the level of importance of interaction. 0 represents lowest importance, 1 represents highest importance.",
|
|
"LocationOfInteraction": "The location where this interaction happens.",
|
|
"RelatedSpaceProgram": "Related space program for the interaction requirement.",
|
|
"RelatingSpaceProgram": "Relating space program for the interaction requirement."
|
|
},
|
|
"description": "The interaction requirement (IfcRelInteractionRequirements) is provided as a relationship that defines the requirements for the interaction (adjacency) of two spaces in the architectural program. In addition the relationship can define the interaction between two parties, such as persons, departments, organizations, that are associated to the space programs (interaction relations between workstations, workstation groups, floor blocks, or spaces, are defined through their associated space programs). The interaction requirement is encoded as an normalised ratio measure between 0 and 1.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcarchitecturedomain/lexical/ifcrelinteractionrequirements.htm"
|
|
},
|
|
"IfcRelNests": {
|
|
"description": "The nesting relationship IfcRelNests is a special type of the general composition/decomposition (or whole/part) relationship IfcRelDecomposes. The nesting relationship can be applied to all subtypes of object, however it requires both the whole and the part to be of the same object type. Decompositions imply a dependency, i.e. the definition of the whole depends on the definition of the parts and the parts depend on the existence of the whole. The behavior that is implied from the dependency has to be established inside the applications.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelnests.htm"
|
|
},
|
|
"IfcRelOccupiesSpaces": {
|
|
"description": "IfcRelOccupiesSpaces is a relationship class that further constrains the parent relationship IfcRelAssignsToActor to a relationship between occupants (IfcOccupant) and either a space (IfcSpace), a collection of spaces (IfcZone), a building storey (IfcBuildingStorey), or a building (IfcBuilding).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedfacilitieselements/lexical/ifcreloccupiesspaces.htm"
|
|
},
|
|
"IfcRelOverridesProperties": {
|
|
"attributes": {
|
|
"OverridingProperties": "A property set, which contains those properties, that have a different value for the subset of objects."
|
|
},
|
|
"description": "The objectified relationship (IfcRelOverridesProperties) defines the relationships between objects and a standard property set. It also defines a set of properties, which values override the standard values given within the standard property set. The inherited attributes should be interpreted as follows: - SELF\\IfcRelDefinedByProperties.RelatingPropertyDefinition: Property set, which defines the standard set of properties assigned to all objects, that have the same set of properties, - SELF\\IfcRelDefines.RelatedObjects: An object occurrence, to which the same set of properties is applied. The object is characterized that certain property values, given by the standard set of properties, have a different value than those defined for all objects of the same style, - OverridingProperties: A set of properties, that have a different value for the subset of objects. The set of the individual overriding properties have to correspond with a standard property set and its containing properties, as given by the RelatingPropertyDefinition attribute. The correspondence is established by the Name attribute. It is provided as specialization of IfcRelDefinedByProperties relationship.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcreloverridesproperties.htm"
|
|
},
|
|
"IfcRelProjectsElement": {
|
|
"attributes": {
|
|
"RelatedFeatureElement": "Reference to the _IfcFeatureElementAddition_ that defines an addition to the volume of the element, by using a Boolean addition operation. An example is a projection at the associated element.",
|
|
"RelatingElement": "Element at which a projection is created by the associated _IfcProjectionElement_."
|
|
},
|
|
"description": "The IfcRelProjectsElement is an objectified relationship between an element and one projection element that creates a modifier to the shape of the element. This relationship implies a Boolean operation of addition for the geometric bodies of the building element and the projection element. The relationship is defined to be a 1:1 relationship, if a building element has more than one projection, several relationship objects have to be used, each pointing to a different projection element.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelprojectselement.htm"
|
|
},
|
|
"IfcRelReferencedInSpatialStructure": {
|
|
"attributes": {
|
|
"RelatedElements": "Set of products, which are referenced within this level of the spatial structure hierarchy. > NOTE Referenced elements are contained elsewhere within the spatial structure, they are referenced additionally by this spatial structure element, e.g., because they span several stories.",
|
|
"RelatingStructure": "Spatial structure element, within which the element is referenced. Any element can be contained within zero, one or many elements of the project spatial structure."
|
|
},
|
|
"description": "This objectified relationship, IfcRelReferencedInSpatialStructure, is used to assign elements in addition to those levels of the project spatial structure, in which they are referenced, but not primarily contained. Any element can be referenced to zero, one or several levels of the spatial structure. Whereas the IfcRelContainsInSpatialStructure relationship is required to be hierarchical (an element can only be contained in exactly one spatial structure element), the IfcRelReferencedInSpatialStructure is not restricted to be hierarchical. Predefined spatial structure elements to which elements can be assigned are - site as IfcSite - building as IfcBuilding - storey as IfcBuildingStorey - space as IfcSpace The same element can be assigned to different spatial structure elements depending on the context. *Use Definition*",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelreferencedinspatialstructure.htm"
|
|
},
|
|
"IfcRelSchedulesCostItems": {
|
|
"description": "An IfcRelSchedulesCostItems is a subtype of IfcRelAssignsToControl that enables one or many instances of IfcCostItem to be assigned to an instance of IfcCostSchedule. IfcRelSchedulesCostItems is used specifically for assigning instances of IfcCostItem to an IfcCostSchedule and incorporates WHERE rules that rigidly enforce this usage.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedmgmtelements/lexical/ifcrelschedulescostitems.htm"
|
|
},
|
|
"IfcRelSequence": {
|
|
"attributes": {
|
|
"RelatedProcess": "Reference to the Process, that is the successor.",
|
|
"RelatingProcess": "Reference to the Process, that is the predecessor.",
|
|
"SequenceType": "The way in which the time lag applies to the sequence.",
|
|
"TimeLag": "Time Duration of the sequence, it is the time lag between the predecessor and the successor as specified by the SequenceType."
|
|
},
|
|
"description": "This objectified relationship handles the concatenation of processes over time. The sequence is defined as relationship between two processes. The related object is the successor of the relating object, being the predecessor. A time lag is assigned to a sequence, and the sequence type defines the way in which the time lag applies to the sequence. IfcRelSequence is defined as an one-to-one relationship, therefore it assigns one predecessor to one successor. However, each IfcProcess can have multiple predecessors and successors, as the sequence relationship is truly an N-to-M relationship.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelsequence.htm"
|
|
},
|
|
"IfcRelServicesBuildings": {
|
|
"attributes": {
|
|
"RelatedBuildings": "Spatial structure elements (including site, building, storeys) that are serviced by the system.",
|
|
"RelatingSystem": "System that services the Buildings."
|
|
},
|
|
"description": "An objectified relationship that defines the relationship between a system and the sites, buildings, storeys or spaces, it serves. Examples of systems are: - building service systems (heating, cooling, waste water system) represented by instances of IfcSystem - idealized structural analysis systems represented by instances of IfcStructuralAnalysisSystem",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelservicesbuildings.htm"
|
|
},
|
|
"IfcRelSpaceBoundary": {
|
|
"attributes": {
|
|
"ConnectionGeometry": "Physical representation of the space boundary. Provided as a **curve or** surface given within the LCS of the space.",
|
|
"InternalOrExternalBoundary": "Defines, whether the Space Boundary is internal (Internal), or external, i.e. adjacent to open space (that can be an partially enclosed space, such as terrace (External).",
|
|
"PhysicalOrVirtualBoundary": "Defines, whether the Space Boundary is physical (Physical) or virtual (Virtual).",
|
|
"RelatedBuildingElement": "Reference to ~~Building~~ Element, that defines the Space Boundaries.",
|
|
"RelatingSpace": "Reference to one spaces that is delimited by this boundary."
|
|
},
|
|
"description": "The space boundary (IfcRelSpaceBoundary) defines the physical or virtual delimiter of a space as its relationship to the surrounding elements. - In the case of physical space boundary, the placement and shape of the boundary may be given, and the building element, providing the boundary, is referenced, - In the case of virtual space boundary, the placement and shape of the boundary may be given, but no building element is referenced. The exact definition of how space boundaries are broken down depends on the view, more detailed conventions on how space boundaries are decomposed can only be given at the domain or application type level. The IfcRelSpaceBoundary is defined as an objectified relationship that handles the element to space relationship by objectifying the relationship between an element and the space it bounds. It is given as a one-to-one relationship, but allows each building element to define many such relationship and each space to be defined by many such relationships. *Use Definitions* If the IfcRelSpaceBoundary is used to express a virtual boundary, the attribute PhysicalOrVirtualBoundary has to be set to VIRTUAL. If this virtual boundary is between two spaces, and the correct location is of interest, the attribute RelatedBuildingElement shall point to an instance of IfcVirtualElement, and the attribute ConnectionGeometry is required to be inserted. If the IfcRelSpaceBoundary is used to express a physical boundary between two spaces, the attribute PhysicalOrVirtualBoundary has to be set to PHYSICAL. The attribute RelatedBuildingElement has to be given and points to the element providing the space boundary. The attribute ConnectionGeometry may be inserted, in this case it describes the physical space boundary geometrically, or it may be omitted, in that case it describes a physical space boundary logically. *Geometry Use Definitions*: The IfcRelSpaceBoundary may have geometry attached. If geometry is not attached, the relationship between space and building element is handled only on a logical level. If geometry is attached, it is given within the local coordinate systems of the space and (if given in addition) of the building element. The connection geometry, when given, can be given as a curve (for 2D representations of space boundaries) or as a surface (for 3D representations of space boundaries). The geometric representation (through the ConnectionGeometry attribute) is defined using either 2D curve geometry or extruded surfaces for space boundaries which bounds prismatic spaces. The following constraints apply to the 2D curve representation: - Curve: IfcPolyline, IfcTrimmedCurve or IfcCompositeCurve The following constraints apply to the surface representation: - Surface: IfcSurfaceOfLinearExtrusion - Profile: IfcArbitraryOpenProfileDef - Extrusion: The extrusion direction shall be vertically, i.e., along the positive Z Axis of the co-ordinate system of the containing spatial structure element.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelspaceboundary.htm"
|
|
},
|
|
"IfcRelVoidsElement": {
|
|
"attributes": {
|
|
"RelatedOpeningElement": "Reference to the ~~opening~~ feature subtraction element which defines a void in the associated ~~opening~~ element.",
|
|
"RelatingBuildingElement": "Reference to ~~building~~ element in which a void is created by associated ~~opening~~ feature subtraction element."
|
|
},
|
|
"description": "Objectified relationship between an ~~building~~ element and one opening element that creates a void in the element. It is a one-to-one relationship. This relationship implies a Boolean operation of subtraction between the geometric bodies of the element and the opening.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelvoidselement.htm"
|
|
},
|
|
"IfcRelationship": {
|
|
"description": "The abstract generalization of all objectified relationships in IFC. Objectified relationships are the preferred way to handle relationships among objects. This allows to keep relationship specific properties directly at the relationship and opens the possibility to later handle relationship specific behavior. There are two different types of relationships, 1-to-1 relationships and 1-to-many relationship. used within the subtypes of IfcRelationship. The following convention applies to all subtypes: - The two sides of the objectified relationship are named - Relating+<name of relating object> and - Related+<name of related object> - In case of the 1-to-many relationship, the related side of the relationship shall be an aggregate SET 1:N",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelationship.htm"
|
|
},
|
|
"IfcRelaxation": {
|
|
"attributes": {
|
|
"InitialStress": "Stress at the beginning. Given as relative to the yield stress of the material and is therefore dimensionless.",
|
|
"RelaxationValue": "Time dependent loss of stress, relative to initial stress and therefore dimensionless."
|
|
},
|
|
"description": "Measure of the decrease in stress over long time interval resulting from plastic flow. It describes the time dependent relative relaxation value for a given initial stress level at constant strain.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcrelaxation.htm"
|
|
},
|
|
"IfcRepresentation": {
|
|
"attributes": {
|
|
"ContextOfItems": "Definition of the representation context for which the different subtypes of representation are valid.",
|
|
"Items": "Set of geometric representation items that are defined for this representation.",
|
|
"LayerAssignments": "Assignment of the whole representation to a single or multiple layer(s). The _LayerAssigments_ can be overridden by _LayerAssigments_ of the _IfcRepresentationItem_'s within the list of _Items_. > NOTE Implementation agreements can restrict the maximum number of layer assignments to 1.",
|
|
"OfProductRepresentation": "Reference to the product shape, for which it is the shape representation.",
|
|
"RepresentationIdentifier": "The optional identifier of the representation as used within a project.",
|
|
"RepresentationMap": "Use of the representation within an _IfcRepresentationMap_. If used, this _IfcRepresentation_ may be assigned to many representations as one of its _Items_ using an _IfcMappedItem_. Using _IfcRepresentationMap_ is the way to share one representation (often of type _IfcShapeRepresentation_) by many products.",
|
|
"RepresentationType": "The description of the type of a representation context. The representation type defines the type of geometry or topology used for representing the product representation. More information is given at the subtypes _IfcShapeRepresentation_ and _IfcTopologyRepresentation_. The supported values for context type are to be specified by implementers agreements."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-43:1992: A representation is one or more representation items that are related in a specified representation context as the representation of some concept. The IfcRepresentation defines the general concept of representing product properties.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcrepresentation.htm"
|
|
},
|
|
"IfcRepresentationContext": {
|
|
"attributes": {
|
|
"ContextIdentifier": "The optional identifier of the representation context as used within a project.",
|
|
"ContextType": "The description of the type of a representation context. The supported values for context type are to be specified by implementers agreements.",
|
|
"RepresentationsInContext": "All shape representations that are defined in the same representation context."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A representation context is a context in which a set of representation items are related. The IfcRepresentationContext defines the context to which the IfcRepresentation of a product is related.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcrepresentationcontext.htm"
|
|
},
|
|
"IfcRepresentationItem": {
|
|
"attributes": {
|
|
"LayerAssignments": "Assignment of the representation item to a single or multiple layer(s). The _LayerAssignments_ can override a _LayerAssignments_ of the _IfcRepresentation_ it is used within the list of _Items_. > NOTE Implementation agreements can restrict the maximum number of layer assignments to 1.",
|
|
"StyledByItem": "Reference to the _IfcStyledItem_ that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-43:1992: A representation item is an element of product data that participates in one or more representations or contributes to the definition of another representation item. A representation item contributes to the definition of another representation item when it is referenced by that representation item. Definition from IAI The IfcRepresentationItem is used within (and only within - directly or indirectly through other IfcRepresentationItem's or IfcShapeAspect's) an IfcRepresentation to represent an IfcProductRepresentation. Most commonly these IfcRepresentationItem's are geometric or topological representation items, that can (but not need to) have presentation style infomation assigned.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcrepresentationitem.htm"
|
|
},
|
|
"IfcRepresentationMap": {
|
|
"attributes": {
|
|
"MapUsage": "",
|
|
"MappedRepresentation": "A representation that is mapped to at least one mapped item.",
|
|
"MappingOrigin": "An axis2 placement that defines the position about which the mapped representation is mapped."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-43:1992: A representation map is the identification of a representation and a representation item in that representation for the purpose of mapping. The representation item defines the origin of the mapping. The representation map is used as the source of a mapping by a mapped item. An IfcRepresentationMap defines the base definition (also referred to as block, cell or macro) within the mapping origin, defined as the placement coordinate system. The representation map is restricted to Cartesian mapping.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcrepresentationmap.htm"
|
|
},
|
|
"IfcResource": {
|
|
"attributes": {
|
|
"ResourceOf": "Reference to the IfcRelAssignsToResource relationship and thus pointing to those objects, which are used as resources."
|
|
},
|
|
"description": "The IfcResource contains the information needed to represent the costs, schedule, and other impacts from the use of a thing in a process. It is not intended to use IfcResource to model the general properties of the things themselves, while an optional linkage from IfcResource to the things to be used can be specified (i.e. the relationship from subtypes of IfcResource to IfcProduct through the IfcRelAssignsToResource relationship). There are two basic intended use of IfcResource. First, if the attributes of the thing are not needed for the purpose of the use of IfcResource, or the types of things are not explicitly modeled in IFC yet, then the linkage between the resource and the thing doesn\u2019t have to be instantiated in the system. That is, the attributes of IfcResource (or its subtypes) alone are sufficient to represent the use of the thing as a resource for the purpose of the project. Second, if the attributes of the thing are needed for the use of IfcResource objects, and they are modeled explicitly as objects (e.g. classes or properties), then the IfcResource instances can be linked to the instances of the type of the things being referenced. Things that might be used as resources and that are already modeled in the IFC include physical products, people and organizations, and materials. The relationship object IfcRelAssignsToResource is provided for this approach. The inherited attribute ObjectType is used as a textual code that identifies the resource type.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcresource.htm"
|
|
},
|
|
"IfcRevolvedAreaSolid": {
|
|
"attributes": {
|
|
"Angle": "Angle through which the sweep will be made. This angle is measured from the plane of the sweep.",
|
|
"Axis": "Axis about which revolution will take place.",
|
|
"AxisLine": "The line of the axis of revolution. IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcCurve() || IfcLine(Axis.Location, IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector(Axis.Z,1.0))"
|
|
},
|
|
"description": "A revolved area solid (IfcRevolvedAreaSolid) is a solid created by revolving a planar bounded surface about an axis. Both, the axis and planar bounded surface shall be in the same plane and the axis shall not intersect the interior of the swept area. If the swept area has inner boundaries, i.e. holes defined, then those holes shall be swept into holes of the solid. The direction of revolution is clockwise when viewed along the axis in the positive direction. Informal propositions: - The AxisLine shall lie in the plane of the SweptArea (as defined at supertype IfcSweptAreaSolid). - The AxisLine shall not intersect the interior of the SweptArea (as defined at supertype IfcSweptAreaSolid). - The Angle shall be between 0\u00b0 and 360\u00b0, or 0 and 2p (depending on the unit type for IfcPlaneAngleMeasure). Illustration:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcrevolvedareasolid.htm"
|
|
},
|
|
"IfcRibPlateProfileProperties": {
|
|
"attributes": {
|
|
"Direction": "Defines the direction of profile definition as described on figure above.",
|
|
"RibHeight": "Height of the ribs.",
|
|
"RibSpacing": "Spacing between the axes of the ribs.",
|
|
"RibWidth": "Width of the ribs.",
|
|
"Thickness": "Defines the thickness of the structural face member."
|
|
},
|
|
"description": "Instances of the entity IfcRibPlateProfileProperties shall be used for a parameterized definition of rib plates.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofilepropertyresource/lexical/ifcribplateprofileproperties.htm"
|
|
},
|
|
"IfcRightCircularCone": {
|
|
"attributes": {
|
|
"BottomRadius": "",
|
|
"Height": ""
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A right circular cone is a CSG primitive in the form of a cone. It is defined by an axis, a point on the axis, (...) and a distance giving the location along the axis from the point to the base of the cone. In addition, a radius is given (...). In contrary to the ISO/CD 10303-42 definition, the IfcRightCircularCone may not be truncated. It provides: - SELF\\IfcCsgPrimitive3D.Position: The location and orientation of the axis system for the primitive. - SELF\\IfcCsgPrimitive3D.Position.Location: The center of the circular area being the bottom face of the cylinder. - SELF\\IfcCsgPrimitive3D.Position.Position[3]:_The z-axis of the inherited placement coordinate system provides the center axis of the _IfcRightCircularCone, and the apex is at the Height value applied to the positive direction of the z-axis. The BottomRadius defines the circular base at the xy-plane of the placement coordinate system. _",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcrightcircularcone.htm"
|
|
},
|
|
"IfcRightCircularCylinder": {
|
|
"attributes": {
|
|
"Height": "",
|
|
"Radius": ""
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A right circular cylinder is a CSG primitive in the form of a solid cylinder of finite height. It is defined by an axis point at the centre of one planar circular face, an axis, a height, and a radius. The faces are perpendicular to the axis and are circular discs with the specified radius. The height is the distance from the first circular face centre in the positive direction of the axis to the second circular face centre. The inherited Position attribute defines the IfcAxis2Placement3D and provides: - SELF\\IfcCsgPrimitive3D.Position: The location and orientation of the axis system for the primitive. - SELF\\IfcCsgPrimitive3D.Position.Location: The center of the circular area being the bottom face of the cylinder. - _SELF\\IfcCsgPrimitive3D.Position.Position[3]:_The z axis provides the center axis and the height is measured from the origin along the positive direction of the z axis.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcrightcircularcylinder.htm"
|
|
},
|
|
"IfcRoof": {
|
|
"attributes": {
|
|
"ShapeType": "Predefined shape types for a roof that are specified in an enumeration."
|
|
},
|
|
"description": "Definition from ISO 6707-1:1989: Construction enclosing the building from above. The IfcRoof is a description of the total roof. It acts as a container entity, that aggregates all components of the roof, it represents. The aggregation is handled via the IfcRelAggregates relationship, relating a roof (IfcRoof) with the related roof entities, like slabs (IfcSlab), rafters and purlins (IfcBeam), or other (included) roofs, such as dormers (IfcRoof). *Property Set Use Definition*: The property sets relating to the IfcRoof are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcRoof are part of this IFC release: - Pset_RoofCommon: common property set for all roof occurrences *Quantity Use Definition*: The quantities relating to the IfcRoof are defined by the IfcElementQuantity and attached by the IfcRelDefinesByProperties. It is accessible by the inverse IsDefinedBy relationship. The following quantities are foreseen, but will be subjected to the local standard of measurement: *Geometry Use Definitions*: The geometric representation of IfcRoof is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Independent geometric representations should only be used when the IfcRoof is not defined as an aggregate. If defined as an aggregate, the geometric representation is the sum of the representation of the components within the aggregate. Local Position The local placement for IfcRoof is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level.. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. If the LocalPlacement is given for the IfcRoof, then all components, which are aggregated to the roof should use this placement as their relative placement. Geometric Representation If the IfcRoof has components (referenced by_SELF\\IfcObject.IsDecomposedBy_) then no independent geometric representation shall defined for the IfcRoof. The IfcRoof is then geometrically represented by the geometric representation of its components. The components are accessed via SELF\\IfcObject.IsDecomposedBy[1].RelatedObjects. If the IfcRoof has no components defined (empty set of SELF\\IfcObject.IsDecomposedBy) then the IfcRoof may be represented by an IfcShapeRepresentation with the RepresentationType = 'Brep'. Illustration:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcroof.htm"
|
|
},
|
|
"IfcRoot": {
|
|
"attributes": {
|
|
"Description": "Optional description, provided for exchanging informative comments.",
|
|
"GlobalId": "Assignment of a globally unique identifier within the entire software world.",
|
|
"Name": "Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule.",
|
|
"OwnerHistory": "Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object, NOTE: only the last modification in stored."
|
|
},
|
|
"description": "Definition from IAI: The IfcRoot is the most abstract and root class for all IFC entity definitions that roots in the kernel or in subsequent layers of the IFC object model. It is therefore the common supertype all all IFC entities, beside those defined in an IFC resource schema. All entities that are subtypes of IfcRoot can be used independently, whereas resource schema entities, that are not subtypes of IfcRoot, are not supposed to be independent entities. The IfcRoot assigns the globally unique ID, and the ownership and history information to the entity. In addition it may provide for a name and a description about the concepts.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcroot.htm"
|
|
},
|
|
"IfcRoundedEdgeFeature": {
|
|
"attributes": {
|
|
"Radius": "The radius of the feature cross section."
|
|
},
|
|
"description": "An edge feature with a rounded cross section shape. Geometry Use Definitions: The geometric representation of IfcRoundedEdgeFeature is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined in the supertype IfcFeatureElementSubtraction. Standard Geometric Representation The use of Standard Geometric Representations is defined in the supertype IfcFeatureElementSubtraction.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcroundededgefeature.htm"
|
|
},
|
|
"IfcRoundedRectangleProfileDef": {
|
|
"attributes": {
|
|
"RoundingRadius": "Radius of the circular arcs, by which all four corners of the rectangle are equally rounded. If not given, zero (= no rounding arcs) applies."
|
|
},
|
|
"description": "Definition from IAI: The IfcRoundedRectangleProfileDef defines a rectangle with equally rounded corners as the profile definition used by the swept surface geometry or the swept area solid. It is given by the X extent, the Y extent, and the radius for the rounded corners, and placed within the 2D position coordinate system, established by the Position attribute. It is placed centric within the position coordinate system, i.e. in the center of the bounding box. Illustration: Table: Parameter of rounded rectangle profile definition",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcroundedrectangleprofiledef.htm"
|
|
},
|
|
"IfcSIUnit": {
|
|
"attributes": {
|
|
"Dimensions": "The dimensional exponents of SI units are derived by function _IfcDimensionsForSiUnit_. IfcDimensionsForSiUnit (SELF.Name)",
|
|
"Name": "The word, or group of words, by which the SI unit is referred to.",
|
|
"Prefix": "The SI Prefix for defining decimal multiples and submultiples of the unit."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-41:1992: An SI unit is the fixed quantity used as a standard in terms of which items are measured as defined by ISO 1000 (clause 2). IfcSIUnit covers both standard base SI units, like meter and second, and derived SI units, like Pascal, square meter and cubic meter.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcsiunit.htm"
|
|
},
|
|
"IfcSanitaryTerminalType": {
|
|
"description": "IfcSanitaryTerminalType defines a particular type of IfcFlowTerminal that is a fixed appliance or terminal usually supplied with water and used for drinking, cleaning or foul water disposal or that is an item of equipment directly used with such an appliance or terminal. Refer also to definition in BS6100 100 3406. *Use Definitions* The IfcSanitaryTerminalType defines a particular type of sanitary terminal, which may be included into the spatial context of the building model through an (or multiple) instances of IfcFlowTerminal. The parameters of the sanitary terminal type are defined through the type driven property sets referred to by the predefined type attribute of IfcSanitaryTerminalType. *Property Set Use Definition*: The property sets relating to the IfcSanitaryTerminalType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcSanitaryTerminalType are part of this IFC release: - Pset_SanitaryTerminalTypeBath: specific property set for the properties of a bath , if available - Pset_SanitaryTerminalTypeBidet: specific property set for the properties of a bidet , if available - Pset_SanitaryTerminalTypeCistern: specific property set for the properties of a cistern (associated with a WC, urinal or range of such devices), if available - Pset_SanitaryTerminalTypeSanitaryFountain: specific property set for the properties of a sanitary fountain, typically for drinking water, if available - Pset_SanitaryTerminalTypeShower: specific property set for the properties of a shower, if available - Pset_SanitaryTerminalTypeSink: specific property set for the properties of a sink , if available - Pset_SanitaryTerminalTypeToiletPan: specific property set for the properties of a toilet pan, if available - Pset_SanitaryTerminalTypeUrinal: specific property set for the properties of a urinal, if available - Pset_SanitaryTerminalTypeWCSeat: specific property set for the properties of a WC seat, if available - Pset_SanitaryTerminalTypeWashHandBasin: specific property set for the properties of a wash hand basin, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"BATH": "Sanitary appliance for immersion of the human body or parts of it.",
|
|
"BIDET": "Waste water appliance for washing the excretory organs while sitting astride the bowl.",
|
|
"CISTERN": "A water storage unit attached to a sanitary terminal that is fitted with a device, operated automatically or by the user, that discharges water to cleanse a water closet (toilet) pan, urinal or slop hopper.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"SANITARYFOUNTAIN": "A sanitary terminal that provides a low pressure jet of water for a specific purpose.",
|
|
"SHOWER": "Installation or waste water appliance that emits a spray of water to wash the human body.",
|
|
"SINK": "Waste water appliance for receiving, retaining or disposing of domestic, culinary, laboratory or industrial process liquids.",
|
|
"TOILETPAN": "Soil appliance for the disposal of excrement.",
|
|
"URINAL": "Soil appliance that receives urine and directs it to a waste outlet.",
|
|
"USERDEFINED": "User-defined type.",
|
|
"WASHHANDBASIN": "Waste water appliance for washing the upper parts of the body.",
|
|
"WCSEAT": "Hinged seat that fits on the top of a water closet (WC) pan.\n{ .deprecated}\n> DEPRECATION Enumerator shall not be used in IFC4."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcplumbingfireprotectiondomain/lexical/ifcsanitaryterminaltype.htm"
|
|
},
|
|
"IfcScheduleTimeControl": {
|
|
"attributes": {
|
|
"ActualDuration": "The actual duration of the task.",
|
|
"ActualFinish": "The date on which a task is actually finished.",
|
|
"ActualStart": "The date on which a task is actually started. NOTE: The scheduled start date must be greater than or equal to the earliest start date. No constraint is applied to the actual start date with respect to the scheduled start date since a task may be started earlier than had originally been scheduled if circumstances allow.",
|
|
"Completion": "The extent of completion expressed as a ratio or percentage.",
|
|
"EarlyFinish": "The earliest date on which a task can be finished.",
|
|
"EarlyStart": "The earliest date on which a task can be started.",
|
|
"FinishFloat": "The difference between the late finish and early finish of a task. Finish float measures how long an task's finish can be delayed and still not have an impact on the overall duration of a schedule.",
|
|
"FreeFloat": "The amount of time during which the start or finish of a task may be varied without any effect on the overall programme of work.",
|
|
"IsCritical": "A flag which identifies whether a scheduled task is a critical item within the programme. NOTE: A task becomes critical when the float time becomes zero or negative.",
|
|
"LateFinish": "The latest date on which a task can be finished.",
|
|
"LateStart": "The latest date on which a task can be started.",
|
|
"RemainingTime": "The amount of time remaining to complete a task. NOTE: The time remaining in which to complete a task may be determined both for tasks which have not yet started and those which have. Remaining time for a task not yet started has the same value as the scheduled duration. For a task already started, remaining time is calculated as the difference between the scheduled finish and the point of analysis.",
|
|
"ScheduleDuration": "The amount of time which is scheduled for completion of a task. NOTE: Scheduled Duration may be calculated as the time from scheduled start date to scheduled finish date.",
|
|
"ScheduleFinish": "The date on which a task is scheduled to be finished. NOTE: The scheduled finish date must be greater than or equal to the earliest finish date.",
|
|
"ScheduleStart": "The date on which a task is scheduled to be started. NOTE: The scheduled start date must be greater than or equal to the earliest start date.",
|
|
"ScheduleTimeControlAssigned": "The assigned schedule time control in the relationship.",
|
|
"StartFloat": "The difference between the late start and early start of a task. Start float measures how long an task's start can be delayed and still not have an impact on the overall duration of a schedule.",
|
|
"StatusTime": "The date or time at which the status of the tasks within the schedule is analyzed.",
|
|
"TotalFloat": "The difference between the duration available to carry out a task and the scheduled duration of the task. NOTE: Total Float time may be calculated as being the difference between the scheduled duration of a task and the available duration from earliest start to latest finish. Float time may be either positive, zero or negative. Where it is zero or negative, the task becomes critical."
|
|
},
|
|
"description": "The IfcScheduleTimeControl captures the time-related information about a process including the different types (i.e. actual, or scheduled) of starting and ending times, duration, float times, etc. Use Definitions Scheduled and actual durations of a task and all float times should be derived within an application from relevant start and finish times that are also attributes of this class. Note that they are not directly derived within the IFC specification at this stage due to the differences in data type between time measures date/time selections. The critical nature of an IfcScheduleTimeControl may also be derived within an application by comparing relevant start and finish date/time selections but is not derived within the IFC specification at this stage.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprocessextension/lexical/ifcscheduletimecontrol.htm"
|
|
},
|
|
"IfcSectionProperties": {
|
|
"attributes": {
|
|
"EndProfile": "The cross section profile at the end point of the longitudinal section.",
|
|
"SectionType": "An indicator whether a specific piece of a cross section is uniform or tapered in longitudinal direction.",
|
|
"StartProfile": "The cross section profile at the start point of the longitudinal section."
|
|
},
|
|
"description": "An IfcSectionProperties defines the cross section properties for a single longitudinal piece of a cross section. General usage: The section piece may be either uniform or tapered. In the latter case an end profile should also be provided. The start and end profiles are assumed to be of the same profile type. Generally only rectangular or circular cross section profiles are assumed to be used.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofilepropertyresource/lexical/ifcsectionproperties.htm"
|
|
},
|
|
"IfcSectionReinforcementProperties": {
|
|
"attributes": {
|
|
"CrossSectionReinforcementDefinitions": "The set of reinforcment properties attached to a section reinforcement properties definition.",
|
|
"LongitudinalEndPosition": "The end position in longitudinal direction for the section reinforcement properties.",
|
|
"LongitudinalStartPosition": "The start position in longitudinal direction for the section reinforcement properties.",
|
|
"ReinforcementRole": "The role, purpose or usage of the reinforcement, i.e. the kind of loads and stresses it is intended to carry, defined for the section reinforcement properties.",
|
|
"SectionDefinition": "Definition of the cross section profile and longitudinal section type.",
|
|
"TransversePosition": "The position for the section reinforcement properties in transverse direction."
|
|
},
|
|
"description": "An IfcSectionReinforcementProperties defines the cross section properties of reinforcement for a single longitudinal piece of a cross section with a specific reinforcement usage type. General usage: Several sets of cross section reinforcement properties represented by instances of IfcReinforcementProperties may be attached to the section reinforcement properties, one for each combination of steel grade and reinforcement bar type and size.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofilepropertyresource/lexical/ifcsectionreinforcementproperties.htm"
|
|
},
|
|
"IfcSectionedSpine": {
|
|
"attributes": {
|
|
"CrossSectionPositions": "Position coordinate systems for the cross sections that form the sectioned spine. The profiles defining the cross sections are positioned within the xy plane of the corresponding position coordinate system.",
|
|
"CrossSections": "A list of at least two cross sections, each defined within the xy plane of the position coordinate system of the cross section. The position coordinate system is given by the corresponding list CrossSectionPositions.",
|
|
"Dim": "The dimensionality of the spine curve is always 3. 3",
|
|
"SpineCurve": "A single composite curve, that defines the spine curve. Each of the composite curve segments correspond to the part between two cross-sections."
|
|
},
|
|
"description": "Definition from ISO/DIS 10303-42-ed2:1999: A sectioned spine is a representation of the shape of a three dimensional object composed of a spine curve and a number of planar cross sections. The shape is defined between the first element of cross sections and the last element of this set. A sectioned spine (IfcSectionedSpine) is a representation of the shape of a three dimensional object composed by a number of planar cross sections, and a spine curve. The shape is defined between the first element of cross sections and the last element of the cross sections. A sectioned spine may be used to represent a surface or a solid but the interpolation of the shape between the cross sections is not defined. For the representation of a solid all cross sections are areas. For representation of a surface all cross sections are curves. The cross sections are defined as profiles, whereas the consecutive profiles may be derived by a transformation of the start profile or the previous consecutive profile. The spine curve shall be of type IfcCompositeCurve, each of its segments (IfcCompositeCurveSegment) shall correspond to the part between exactly two consecutive cross-sections. Informal propositions - non of the cross sections, after being placed by the cross section positions, shall intersect - non of the cross sections, after being placed by the cross section positions, shall lie in the same plane - the local origin of each cross section position shall lie at the beginning or end of a composite curve segment.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcsectionedspine.htm"
|
|
},
|
|
"IfcSensorType": {
|
|
"description": "An IfcSensorType defines a particular type of sensor which is used for detection in a control system such as a building automation control system. *Use Definitions* An IfcSensorType provides for all forms of sensor. Usage of IfcSensorType defines the parameters for one or more occurrences of IfcDistributionControlElement. Parameters are specified through property sets that are enumerated in the IfcSensorTypeEnum data type. *Property Set Use Definition*: The property sets relating to the IfcSensorType defined by the IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcSensorType are part of this IFC release: - Pset_SensorTypeCO2Sensor: specific property set for the properties of a CO2 sensor, if available - Pset_SensorTypeFireSensor: specific property set for the properties of a fire sensor, if available - Pset_SensorTypeGasSensor: specific property set for the properties of a gas sensor, if available - Pset_SensorTypeHeatSensor: specific property set for the properties of a heat sensor, if available - Pset_SensorTypeHumiditySensor: specific property set for the properties of a humidity sensor, if available - Pset_SensorTypeLightSensor: specific property set for the properties of a light sensor, if available - Pset_SensorTypeMovementSensor: specific property set for the properties of a movement sensor, if available - Pset_SensorTypePressureSensor: specific property set for the properties of a pressure sensor, if available - Pset_SensorTypeSmokeSensor: specific property set for the properties of a smoke sensor, if available - Pset_SensorTypeSoundSensor: specific property set for the properties of a sound sensor, if available - Pset_SensorTypeTemperatureSensor: specific property set for the properties of a temperature sensor, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
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"predefined_types": {
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"CO2SENSOR": "",
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"FIRESENSOR": "A device that senses or detects fire",
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|
"FLOWSENSOR": "A device that senses or detects flow in a fluid.",
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"GASSENSOR": "A device that senses or detects gas concentration (other than CO2)",
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|
"HEATSENSOR": "A device that senses or detects heat.",
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|
"HUMIDITYSENSOR": "A device that senses or detects humidity.",
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|
"LIGHTSENSOR": "A device that senses or detects light.",
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|
"MOISTURESENSOR": "A device that senses or detects moisture.",
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|
"MOVEMENTSENSOR": "A device that senses or detects movement.",
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|
"NOTDEFINED": "Undefined type.",
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|
"PRESSURESENSOR": "A device that senses or detects pressure.",
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|
"SMOKESENSOR": "A device that senses or detects smoke.",
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|
"SOUNDSENSOR": "A device that senses or detects sound.",
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|
"TEMPERATURESENSOR": "A device that senses or detects temperature.",
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"USERDEFINED": "User-defined type."
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|
},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcbuildingcontrolsdomain/lexical/ifcsensortype.htm"
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|
},
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|
"IfcServiceLife": {
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|
"attributes": {
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|
"ServiceLifeDuration": "The length or duration of a service life.",
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|
"ServiceLifeType": "Predefined service life types from which that required may be set."
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|
},
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|
"description": "An IfcServiceLife is the period of time that an artefact (typically a product or asset) will last. IfcServiceLife is related to one or more products through the IfcRelAssignsToProduct relationship class. An IfcServiceLife may also be assigned to an asset through use of the IfcRelAssignsToGroup relationship class Note that the IfcServiceLife.ServiceLifeDuration attribute replaces the previous IfcAsset.ExpectedLife attribute.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedfacilitieselements/lexical/ifcservicelife.htm"
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|
},
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|
"IfcServiceLifeFactor": {
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|
"attributes": {
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|
"LowerValue": "Lower of the three values assigned to the service life factor.",
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|
"MostUsedValue": "Most used of the three values assigned to the service life factor.",
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|
"UpperValue": "Upper of the three values assigned to the service life factor."
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|
},
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|
"description": "An IfcServiceLifeFactor captures the various factors that impact upon the expected service life of an artefact. Note that each instance of IfcServiceLifeFactor may have a name that describes the form of impact that the factor has on the service life. Because there is a significant list of such potential impacts, they are not explicitly collected together into an enumeration. In order to name an instance of IfcServiceLifeFactor, the inherited Name attribute should be used. Within the IFC specification, any number of service life factors may be allowed to impact upon the service life of an artefact. In many cases, it is probable that the ISO standard that specifies good practice for service life consideration will be applied. Within the ISO standard, there are seven defined (named) service life factors that may be applied to an IfcServiceLife. These are captured in the IfcServiceLifeFactorEnum (together with a user defined capability). Each factor can have three values that define an upper, lower and most used (or median) value. One or more instances of IfcServiceLifeFactor can be related to an IfcServiceLife through the IfcRelDefinesByProperties relationship class.",
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|
"predefined_types": {
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|
"A_QUALITYOFCOMPONENTS": "",
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|
"B_DESIGNLEVEL": "",
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|
"C_WORKEXECUTIONLEVEL": "",
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|
"D_INDOORENVIRONMENT": "",
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|
"E_OUTDOORENVIRONMENT": "",
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|
"F_INUSECONDITIONS": "",
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|
"G_MAINTENANCELEVEL": "",
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|
"NOTDEFINED": "",
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|
"USERDEFINED": ""
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|
},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedfacilitieselements/lexical/ifcservicelifefactor.htm"
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|
},
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|
"IfcShapeAspect": {
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|
"attributes": {
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|
"Description": "The word or group of words that characterize the shape aspect. It can be used to add additional meaning to the name of the aspect.",
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|
"Name": "The word or group of words by which the shape aspect is known. It is a tag to indicate the particular semantic of a component within the product definition shape, used to provide meaning. Example: use the tag \"Glazing\" to define which component of a window shape defines the glazing area.",
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|
"PartOfProductDefinitionShape": "Reference to the product definition shape of which this class is an aspect.",
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|
"ProductDefinitional": "An indication that the shape aspect is on the physical boundary of the product definition shape. If the value of this attribute is TRUE, it shall be asserted that the shape aspect being identified is on such a boundary. If the value is FALSE, it shall be asserted that the shape aspect being identified is not on such a boundary. If the value is UNKNOWN, it shall be asserted that it is not known whether or not the shape aspect being identified is on such a boundary. --- EXAMPLE: Would be FALSE for a center line, identified as shape aspect; would be TRUE for a cantilever. ---",
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|
"ShapeRepresentations": "List of ~~shape~~ representations. Each member defines a valid representation of a particular type within a particular representation context as being an aspect (or part) of a product definition."
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|
},
|
|
"description": "Definition from ISO/CD 10303-41:1992: The shape aspect is an identifiable element of the shape of a product. Definition from IAI: The IfcShapeAspect allows for grouping of shape representation items that represent aspects (or components) of the shape of a product. Thereby shape representations of components of the product shape represent a distinctive part to a product that can be explicitly addressed.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcshapeaspect.htm"
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|
},
|
|
"IfcShapeModel": {
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|
"attributes": {
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|
"OfShapeAspect": "Reference to the shape aspect, for which it is the shape representation."
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|
},
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|
"description": "The IfcShapeModel represents the concept of a particular geometric and/or topological representation of a product's shape or a product component's shape within a representation context. This representation context has to be a geometric representation context (with the exception of topology representations without associated geometry). The two subtypes are IfcShapeRepresentation to cover the geometric models (or sets) that represent a shape, and IfcTopologyRepresentation to cover the conectivity of a product or product component. The topology may or may not have geometry associated. The IfcShapeModel can be a shape representation (geometric and/or topologogical) of a product (via IfcProductDefinitionShape), or a shape representation (geometric and/or topologogical) of a component of a product shape (via IfcShapeAspect).",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcshapemodel.htm"
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|
},
|
|
"IfcShapeRepresentation": {
|
|
"description": "Definition from ISO/CD 10303-42:1992: The shape representation is a specific kind of representation that represents a shape. Definition from IAI: The IfcShapeRepresentation represents the concept of a particular geometric representation of a product or a product component within a specific geometric representation context. The inherited attribute RepresentationType is used to define the geometric model used for the shape representation, the inherited attribute RepresentationIdentifier is used to denote the part of the representation captured by the IfcShapeRepresentation (e.g. Axis, Body, etc.). Several representation types for shape representation are included as predefined types: Table 1: string values for the inherited attribute 'RepresentationType'.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcshaperepresentation.htm"
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|
},
|
|
"IfcShellBasedSurfaceModel": {
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|
"attributes": {
|
|
"Dim": "The space dimensionality of this class, it is always 3. 3",
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|
"SbsmBoundary": ""
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|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A shell based surface model is described by a set of open or closed shells of dimensionality 2. The shells shall not intersect except at edges and vertices. In particular, distinct faces may not intersect. A complete face of one shell may be shared with another shell. Coincident portions of shells shall both reference the same faces, edges and vertices defining the coincident region. There shall be at least one shell. A shell may exist independently of a surface model. Informal propositions - The dimensionality of the shell based surface model is 2. - The shells shall not overlap or intersect except at common faces, edges or vertices.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcshellbasedsurfacemodel.htm"
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|
},
|
|
"IfcSimpleProperty": {
|
|
"description": "A generalization of a single property object. The various subtypes of IfcSimpleProperty establish different ways in which a property value can be set.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifcsimpleproperty.htm"
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|
},
|
|
"IfcSite": {
|
|
"attributes": {
|
|
"LandTitleNumber": "The land title number (designation of the site within a regional system).",
|
|
"RefElevation": "Datum elevation relative to sea level.",
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|
"RefLatitude": "World Latitude at reference point (most likely defined in legal description). Defined as integer values for degrees, minutes, seconds, and, optionally, millionths of seconds with respect to the world geodetic system WGS84. > Latitudes are measured relative to the geodetic equator, north of the equator by positive values - from 0 till +90, south of the equator by negative values - from 0 till -90.",
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|
"RefLongitude": "World Longitude at reference point (most likely defined in legal description). Defined as integer values for degrees, minutes, seconds, and, optionally, millionths of seconds with respect to the world geodetic system WGS84. > Longitudes are measured relative to the geodetic zero meridian, nominally the same as the Greenwich prime meridian: longitudes west of the zero meridian have positive values - from 0 till +180, longitudes east of the zero meridian have negative values - from 0 till -180.",
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|
"SiteAddress": "Address given to the site for postal purposes."
|
|
},
|
|
"description": "Definition from ISO 6707-1:1989: Area where construction works are undertaken. A defined area of land, possibly covered with water, on which the project construction is to be completed. A site may be used to erect building(s) or other AEC products. A site (IfcSite) may include a definition of the single geographic reference point for this site (global position using Longitude, Latitude and Elevation) for the project. This definition may specify an exact global position of the origin of the local placement of the IfcSite in geospatial terms or it may specify an approximate position intended for informational purposes only. The geometrical placement of the site, defined by the IfcLocalPlacement, shall be always relative to the spatial structure element, in which this site is included, or absolute, i.e. to the world coordinate system, as established by the geometric representation context of the project. The world coordinate system, established at the IfcProject.RepresentationContexts, may include a definition of the true north within the XY plane of the world coordinate system, if provided, it can be obtained at IfcGeometricRepresentationContext.TrueNorth. A project may span over several connected or disconnected sites. Therefore site complex provides for a collection of sites included in a project. A site can also be decomposed in parts, where each part defines a site section. This is defined by the composition type attribute of the supertype IfcSpatialStructureElements which is interpreted as follow: - COMPLEX = site complex - ELEMENT = site - PARTIAL = site section *Property Set Use Definition* The property sets relating to the IfcSite are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcSite are part of this IFC release: - Pset_SiteCommon: common property set for all types of site *Quantity Use Definition* The quantities relating to the IfcSite are defined by the IfcElementQuantity and attached by the IfcRelAssignsProperties. The following quantities are foreseen, but will be subjected to the local standard of measurement: *Spatial Structure Use Definition* The IfcSite is used to build the spatial structure of a building (that serves as the primary project breakdown and is required to be hierarchical). The spatial structure elements are linked together by using the objectified relationship IfcRelAggregates. The IfcSite references them by its inverse relationships: - IfcSite.Decomposes -- referencing (IfcProject || IfcSite) by IfcRelAggregates.RelatingObject, If it refers to another instance of IfcSite, the referenced IfcSite needs to have a different and higher CompositionType, i.e. COMPLEX (if the other IfcSite has ELEMENT), or ELEMENT (if the other IfcSite has PARTIAL). - IfcSite.IsDecomposedBy -- referencing (IfcSite || IfcBuilding || IfcSpace) by IfcRelAggregates.RelatedObjects. If it refers to another instance of IfcSite, the referenced IfcSite needs to have a different and lower CompositionType, i.e. ELEMENT (if the other IfcSite has COMPLEX), or PARTIAL (if the other IfcSite has ELEMENT). If there are building elements and/or other elements directly related to the IfcSite (like a fence, or a shear wall), they are associated with the IfcSite by using the objectified relationship IfcRelContainedInSpatialStructure. The IfcIfcSite references them by its inverse relationship: * IfcSite.ContainsElements -- referencing any subtype of IfcProduct (with the exception of other spatial structure element) by IfcRelContainedInSpatialStructure.RelatedElements. *Geometry Use Definitions* The geometric representation of IfcSite is given by the IfcProductDefinitionShape and IfcLocalPlacement allowing multiple geometric representations. Local placement The local placement for IfcSite is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point to the IfcSpatialStructureElement of type \"IfcSite\", if relative placement is used (e.g. to position a site relative a a site complex, or a site section to a site). - If the relative placement is not used, the absolute placement is defined within the world coordinate system. If there is only one site object, then this is the default situation. Foot Print Representation The foot print representation of IfcSite is given by either a single 2D curve (such as IfcPolyline or IfcCompositeCurve), or by a list of 2D curves (in case of inner boundaries). The representation identifier and type of this geometric representation of IfcSite is: - IfcShapeRepresentation.RepresentationIdentifier = 'FootPrint' - IfcShapeRepresentation.RepresentationType = 'GeometricCurveSet' Survey Points Representation The survey point representation of IfcSite is defined using a set of survey points and optionally breaklines. The breaklines are restricted to only connect points given in the set of survey points. Breaklines, if given, are used to constrain the triangulation. The representation identifier and type of this geometric representation of IfcSite is: - IfcShapeRepresentation.RepresentationIdentifier = 'SurveyPoints' - IfcShapeRepresentation.RepresentationType = 'GeometricSet' Facetation Representation The facetation representation of IfcSite is defined using a surface model, based on the IfcFaceBasedSurfaceModel or on the IfcShellBasedSurfaceModel. Normally the surface model is the result after triangulation of the site survey points. The representation identifier and type of this representation of IfcSite is: - IfcShapeRepresentation.RepresentationIdentifier = 'Facetation' - IfcShapeRepresentation.RepresentationType = 'SurfaceModel' Body Representation The body (or solid model) representation of IfcSite is defined using a faceted boundary representation based on the IfcFacetedBrep or on the IfcFacetedBrepWithVoids. The representation identifier and type of this representation of IfcSite is: - IfcShapeRepresentation.RepresentationIdentifier = 'Body' - IfcShapeRepresentation.RepresentationType = 'Brep'",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcsite.htm"
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|
},
|
|
"IfcSlab": {
|
|
"description": "A slab is a component of the construction that normally encloses a space vertically. The slab may provide the lower support (floor) or upper construction (roof slab) in any space in a building. It shall be noted, that only the core or constructional part of this construction is considered to be a slab. The upper finish (flooring, roofing) and the lower finish (ceiling, suspended ceiling) are considered to be coverings. A special type of slab is the landing, described as a floor section to which one or more stair flights or ramp flights connect. May or may not be adjacent to a building storey floor.",
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|
"predefined_types": {
|
|
"BASESLAB": "The slab is used to represent a floor slab against the ground (and thereby being a part of the foundation). Another name is mat foundation.",
|
|
"FLOOR": "The slab is used to represent a floor slab.",
|
|
"LANDING": "The slab is used to represent a landing within a stair or ramp.",
|
|
"NOTDEFINED": "",
|
|
"ROOF": "The slab is used to represent a roof slab (either flat or sloped).",
|
|
"USERDEFINED": ""
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcslab.htm"
|
|
},
|
|
"IfcSlabType": {
|
|
"description": "The element type (IfcSlabType) defines a list of commonly shared property set definitions of a slab and an optional set of product representations. It is used to define a slab specification (i.e. the specific product information, that is common to all occurrences of that product type). An IfcSlabType is used to define the common properties of a specific slab that may be applied to many instances of that type to assign a specific style. A slab type can be used for a floor slab, a roof slab, a stair landing or a ramp flight. Building element types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The IfcSlabType can have common material (using the inverse relationship HasAssociations) or property set information (using HasPropertySets) assigned. If present, it does apply equally to all occurrences of the IfcSlabType. Property set information may be overridden at the occurrence. The occurrences of the IfcSlabType are represented by instances of IfcSlab. ~~or IfcRampFlight~~ Informal proposition: - The material assignment, if provided using the IfcRelAssociatesMaterial relationship, shall not reference the IfcMaterialLayerSetUsage.",
|
|
"predefined_types": {
|
|
"BASESLAB": "The slab is used to represent a floor slab against the ground (and thereby being a part of the foundation). Another name is mat foundation.",
|
|
"FLOOR": "The slab is used to represent a floor slab.",
|
|
"LANDING": "The slab is used to represent a landing within a stair or ramp.",
|
|
"NOTDEFINED": "",
|
|
"ROOF": "The slab is used to represent a roof slab (either flat or sloped).",
|
|
"USERDEFINED": ""
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcslabtype.htm"
|
|
},
|
|
"IfcSlippageConnectionCondition": {
|
|
"attributes": {
|
|
"SlippageX": "Slippage of that connection. Defines the maximum displacement in x-direction without any loading applied.",
|
|
"SlippageY": "Slippage of that connection. Defines the maximum displacement in y-direction without any loading applied.",
|
|
"SlippageZ": "Slippage of that connection. Defines the maximum displacement in z-direction without any loading applied."
|
|
},
|
|
"description": "Instances of the entity IfcSlippageConnectionCondition shall be used to describe connection properties needed to specify slippage.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcslippageconnectioncondition.htm"
|
|
},
|
|
"IfcSolidModel": {
|
|
"attributes": {
|
|
"Dim": "The space dimensionality of this class, it is always 3. 3"
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A solid model is a complete representation of the nominal shape of a product such that all points in the interior are connected. Any point can be classified as being inside, outside, or on the boundary of a solid. There are several different types of solid model representations.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcsolidmodel.htm"
|
|
},
|
|
"IfcSoundProperties": {
|
|
"attributes": {
|
|
"IsAttenuating": "If TRUE, values represent sound attenuation. If FALSE, values represent sound generation.",
|
|
"SoundScale": "Reference sound scale",
|
|
"SoundValues": "Sound values at a specific frequency. There may be cases where less than eight values are specified."
|
|
},
|
|
"description": "Common definition to capture the properties of sound typically used within the context of building services and flow distribution systems. Sound properties are sound power or pressure levels across eight octave bands specifying the amount of sound generation or sound attenuation. IfcSoundProperties is a statically defined property set and should be attached to the instance(s) of IfcDistributionFlowElement through the IfcRelDefinesByProperties relationship.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcsoundproperties.htm"
|
|
},
|
|
"IfcSoundValue": {
|
|
"attributes": {
|
|
"Frequency": "The frequency of the sound.",
|
|
"SoundLevelSingleValue": "A sound pressure or sound power value. For sound pressure levels, the values are measured in decibels at a reference pressure of 20 microPascals for the referenced octave band frequency. For sound power levels, the values are measured in decibels at a reference power of 1 picowatt(10\\^(-12) watt) for the referenced octave band frequency.",
|
|
"SoundLevelTimeSeries": "A time series of sound pressure or sound power values. For sound pressure levels, the values are measured in decibels at a reference pressure of 20 microPascals for the referenced octave band frequency. For sound power levels, the values are measured in decibels at a reference power of 1 picowatt(10\\^(-12) watt) for the referenced octave band frequency."
|
|
},
|
|
"description": "A sound value or time series of sound values at a specified frequency.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcsoundvalue.htm"
|
|
},
|
|
"IfcSpace": {
|
|
"attributes": {
|
|
"BoundedBy": "Reference to Set of Space Boundaries that defines the physical or virtual delimitation of that Space.",
|
|
"ElevationWithFlooring": "Level of flooring of this space; the average shall be taken, if the space ground surface is sloping or if there are level differences within this space.",
|
|
"HasCoverings": "Reference to _IfcCovering_ by virtue of the objectified relationship _IfcRelCoversSpaces_. It defines the concept of a space having coverings assigned. Those coverings may represent different flooring, or tiling areas. > NOTE Coverings are often managed by the space, and not by the building element, which they cover.",
|
|
"InteriorOrExteriorSpace": "Defines, whether the Space is interior (Internal), or exterior (External), i.e. part of the outer space."
|
|
},
|
|
"description": "A space represents an area or volume bounded actually or theoretically. Spaces are areas or volumes that provide for certain functions within a building.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcspace.htm"
|
|
},
|
|
"IfcSpaceHeaterType": {
|
|
"description": "The element type IfcSpaceHeaterType defines a list of commonly shared property set definitions of a space heater and an optional set of product representations. It is used to define a space heater specification (i.e. the specific product information, that is common to all occurrences of that product type). A space heater type is used to define the common properties of a space heater device that may be applied to many occurrences of that type. Space heaters utilize a combination of radiation and/or natural convection using a heating source such as steam or hot water. Examples of space heaters include radiators, convectors, baseboard and finned-tube heaters, etc. Space heater types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcSpaceHeaterType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_SpaceHeaterTypeCommon: common property set for all space heater types Pset_SpaceHeaterTypeHydronic: property set for all hydronic space heater types",
|
|
"predefined_types": {
|
|
"BASEBOARDHEATER": "",
|
|
"CONVECTOR": "A heat-distributing unit that operates with gravity-circulated air.",
|
|
"FINNEDTUBEUNIT": "",
|
|
"NOTDEFINED": "Undefined space heater type.",
|
|
"PANELRADIATOR": "",
|
|
"SECTIONALRADIATOR": "",
|
|
"TUBULARRADIATOR": "",
|
|
"UNITHEATER": "",
|
|
"USERDEFINED": "User-defined space heater type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcspaceheatertype.htm"
|
|
},
|
|
"IfcSpaceProgram": {
|
|
"attributes": {
|
|
"HasInteractionReqsFrom": "Set of inverse relationships to space or work interaction requirement objects (FOR RelatedObject).",
|
|
"HasInteractionReqsTo": "Set of inverse relationships to space or work interaction requirements (FOR RelatingObject).",
|
|
"MaxRequiredArea": "The maximum floor area programmed for this space (according to client requirements)",
|
|
"MinRequiredArea": "The minimum floor area programmed for this space (according to client requirements)",
|
|
"RequestedLocation": "Location within the building structure, requested for the space.",
|
|
"SpaceProgramIdentifier": "Identifier for this space program. It often refers to a number (or code) assigned to the space program. Example: R-001.",
|
|
"StandardRequiredArea": "The floor area programmed for this space (according to client requirements)."
|
|
},
|
|
"description": "Architectural program for a space in the building or facility being designed; essentially the requirements definition for such a building space. The assignment of a person or an organization to a space program, e.g., as the anticipated occupants of the space, is handled through using the objectified relationship IfcRelAssignsToActor referring to IfcActor. Space programs can be nested, i.e. an IfcSpaceProgram can specify a program group up to any desired level. This is handled through using the objectified relationship IfcRelNests. *Property Set Use Definition*: The property sets relating to the IfcSpaceProgram are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcSpaceProgram are part of this IFC release: - Pset_SpaceProgramCommon: common property set for all types of the space program *General Use Definition* The IfcSpaceProgram entity is used to define: - the architectural program for a space in the building or facility being designed; - the standard for space allocation that can be assigned to persons within an organization. As the architectural program, the IfcSpaceProgram class sets down the requirements definition for a space in the building or facility being designed. Used in this way, it defines the client requirements for the space before the building in designed. Space programs can change over the life cycle of a building, after the building is occupied. Changes to space programs take place in the facilities management/operations phase of the building life cycle. As a space standard for facilities management (FM), the IfcSpaceProgram class defines the requirements for usage of a space according to the roles of persons that will occupy the space. This could take into account role driven elements such as whether the space should be a single person office, corner space, glazing on two sides etc. In order to use the class as an space standard within FM, a classification of spaces must have been established. This does not mean that each individual space needs to have a classification although for locating persons having an assigned space standard, this would be desirable.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcarchitecturedomain/lexical/ifcspaceprogram.htm"
|
|
},
|
|
"IfcSpaceThermalLoadProperties": {
|
|
"attributes": {
|
|
"ApplicableValueRatio": "Percentage of use requirement or criteria applicable to the space, interpretation depends on the source type.",
|
|
"MaximumValue": "The maximum thermal load value. If this value is less than zero (negative), then the thermal load is lost from the space. If the value is greater than zero (positive), then the thermal load is a gain to the space. If the minimum value is not specified, then this value is the actual value. At least one of the maximum, minimum, or time series values must be specified.",
|
|
"MinimumValue": "The minimum thermal load value. If this value is less than zero (negative), then the thermal load is lost from the space. If the value is greater than zero (positive), then the thermal load is a gain to the space. The requirement for the inclusion of this attribute is dependent on the load source. At least one of the maximum, minimum, or time series values must be specified.",
|
|
"PropertySource": "The source of the space thermal load properties (e.g., are these design values, measured values, etc.).",
|
|
"SourceDescription": "Further specification for the source, which might be specific for a region or project. E.g. whether the heat gain from Person is caused by specific activities.",
|
|
"ThermalLoadSource": "Source of the thermal loss or gain. Depending on the source, the maximum and minimum values have to be interpreted. Refer to the space usage in Pset_SpaceProgramCommon to determine thermal loads associated with the activity levels of people.",
|
|
"ThermalLoadTimeSeriesValues": "A time series of the thermal load values. If a value is less than zero (negative), then the thermal load is lost from the space. If the value is greater than zero (positive), then the thermal load is a gain to the space. These values are contributed from the specified thermal load source. At least one of the maximum, minimum, or time series values must be specified.",
|
|
"ThermalLoadType": "Defines the type of thermal load (e.g., sensible, latent, radiant, etc.).",
|
|
"UserDefinedPropertySource": "This attribute must be defined if the PropertySource is USERDEFINED.",
|
|
"UserDefinedThermalLoadSource": "This attribute must be defined if the ThermalLoadSource is USERDEFINED."
|
|
},
|
|
"description": "The space thermal load IfcSpaceThermalLoadProperties defines all thermal losses and gains occurring within a space or zone. Those losses or gains can either be requirements (desired values) or criteria (actual values). The thermal load source attribute defines an enumeration of possible sources of the thermal load. The maximum, minimum, time series and applicable value ratio values are all interpreted according to the source. The maximum and minimum values should not be used if time series values are provided. The IfcSpaceThermalLoadProperties is a statically defined property set and should be attached to the instance(s) of IfcSpace through the IfcRelDefinesByProperties relationship. If there are several different thermal loads occurring within a space, multiple instances of IfcSpaceThermalLoadProperties should be assigned.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcspacethermalloadproperties.htm"
|
|
},
|
|
"IfcSpaceType": {
|
|
"description": "The IfcSpaceType defines a list of commonly shared property set definitions of a space and an optional set of product representations. It is used to define an space specification (i.e. the specific space information, that is common to all occurrences of that space type). A space type is used to define the common properties of a certain type of space that may be applied to many instances of that type to assign a specific style. Space types may be exchanged without being already assigned to occurrences. The occurrences of IfcSpaceType are represented by instances of IfcSpace.",
|
|
"predefined_types": {
|
|
"NOTDEFINED": "",
|
|
"USERDEFINED": ""
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcspacetype.htm"
|
|
},
|
|
"IfcSpatialStructureElement": {
|
|
"attributes": {
|
|
"CompositionType": "Denotes, whether the predefined spatial structure element represents itself, or an aggregate (complex) or a part (part). The interpretation is given separately for each subtype of spatial structure element.",
|
|
"ContainsElements": "Set of spatial containment relationships, that holds those elements, which are contained within this element of the project spatial structure. > NOTE The spatial containment relationship, established by IfcRelContainedInSpatialStructure, is required to be an hierarchical relationship, i.e. each element can only be assigned to 0 or 1 spatial structure element.",
|
|
"LongName": "Long name for a spatial structure element, used for informal purposes. Maybe used in conjunction with the inherited Name attribute.",
|
|
"ReferencesElements": "Set of spatial reference relationships, that holds those elements, which are referenced, but not contained, within this element of the project spatial structure. > NOTE The spatial reference relationship, established by IfcRelReferencedInSpatialStructure, is not required to be an hierarchical relationship, i.e. each element can be assigned to 0, 1 or many spatial structure elements. EXAMPLE A curtain wall maybe contained in the ground floor, but maybe referenced in all floors, it reaches.",
|
|
"ServicedBySystems": "Set of relationships to Systems, that provides a certain service to the Building. The relationship is handled by the objectified relationship IfcRelServicesBuildings."
|
|
},
|
|
"description": "A spatial structure element (IfcSpatialStructureElement) is the generalization of all spatial elements that might be used to define a spatial structure. That spatial structure is often used to provide a project structure to organize a building project. A spatial project structure might define as many levels of decomposition as necessary for the building project. Elements within the spatial project structure are: - site as IfcSite - building as IfcBuilding - storey as IfcBuildingStorey - space as IfcSpace or aggregations or parts thereof. The composition type declares an element to be either an element itself, or an aggregation (complex) or a decomposition (part). The interpretation of these types is given at each subtype of IfcSpatialStructureElement. The IfcRelAggregates is defined as an 1-to-many relationship and used to establish the relationship between exactly two levels within the spatial project structure. Finally the highest level of the spatial structure is assigned to IfcProject using the IfcRelAggregates. Informal proposition: - The spatial project structure, established by the IfcRelAggregates, shall be acyclic. - A site should not be (directly or indirectly) associated to a building, storey or space. - A building should not be (directly or indirectly) associated to a storey or space. - A storey should not be (directly or indirectly) associated to a space. *Spatial Structure Use Definition*",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcspatialstructureelement.htm"
|
|
},
|
|
"IfcSpatialStructureElementType": {
|
|
"description": "The element type (IfcSpatialStructureElementType) defines a list of commonly shared property set definitions of a spatial structure element and an optional set of product representations. It is used to define an element specification (i.e. the specific element information, that is common to all occurrences of that element type). A spatial structure element type is used to define the common properties of a certain type of a spatial structure element that may be applied to many instances of that type to assign a specific style. Spatial structure element types (i.e. the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of subtypes of the abstract IfcSpatialStructureElementType are represented by instances of subtypes of IfcSpatialStructureElement.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcspatialstructureelementtype.htm"
|
|
},
|
|
"IfcSphere": {
|
|
"attributes": {
|
|
"Radius": ""
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A sphere is a CSG primitive with a spherical shape defined by a centre and a radius. The inherited Position attribute defines the IfcAxis2Placement3D and provides: - SELF\\IfcCsgPrimitive3D.Position: The location and orientation of the axis system for the primitive. - SELF\\IfcCsgPrimitive3D.Position.Location: The center of the sphere.. - _SELF\\IfcCsgPrimitive3D.Position.Position[3]:_The z axis points at its positve direction towards the north pole, and by its negative directions towards the south pole.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcsphere.htm"
|
|
},
|
|
"IfcStackTerminalType": {
|
|
"description": "The IfcStackTerminalType defines a particular type of IfcFlowTerminal placed at the top of a ventilating stack (to prevent ingress by birds, rainwater etc.) or rainwater pipe (to act as a collector or hopper for discharge from guttering). *Use Definitions* An IfcStackTerminalType identifies a particular type of IfcFlowTerminal that is placed at the top of a vertical pipe in a waste/drainage/rainwater system to fulfill a particular purpose. The purpose is by default in the context of the stack subsystem in which the terminal participates. The particular type of the stack terminal is defined by the set value of the stack terminal type enumeration. An IfcStackTerminalType may be included into the spatial context of the building model through an (or multiple) instances of IfcFlowTerminal. *Property Set Use Definition*: Note that there are no predefined property sets assigned to this type at present. *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"BIRDCAGE": "Guard cage, typically wire mesh, at the top of the stack preventing access by birds.",
|
|
"COWL": "A cowling placed at the top of a stack to eliminate downdraft.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"RAINWATERHOPPER": "A box placed at the top of a rainwater downpipe to catch rainwater from guttering.",
|
|
"USERDEFINED": "User-defined type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcplumbingfireprotectiondomain/lexical/ifcstackterminaltype.htm"
|
|
},
|
|
"IfcStair": {
|
|
"attributes": {
|
|
"ShapeType": "Predefined shape types for a stair that are specified in an Enum."
|
|
},
|
|
"description": "Definition from ISO 6707-1:1989: Construction comprising a succession of horizontal stages (steps or landings) that make it possible to pass on foot to other levels. A vertical passageway allowing occupants to walk (step) from one floor level to another floor level at a different elevation. It may include a landing as an intermediate floor slab. The stair is a container entity that aggregates all components of the stair, it represents. The aggregation is handled via the IfcRelAggregates relationship, relating an IfcStair with the related flights (IfcStairFlight) and landings (IfcSlab with type 'Landing'). *Property Set Use Definition*: The property sets relating to the IfcStair are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcStair are part of this IFC release: - Pset_StairCommon: common property set for all stair occurrences *Geometry Use Definitions*: The geometric representation of IfcStair is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Independent geometric representations should only be used when the IfcStair is not defined as an aggregate. If defined as an aggregate, the geometric representation is the sum of the representation of the components within the aggregate. Local placement The local placement for IfcStair is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. If the LocalPlacement is given for the IfcStair, then all components, which are aggregated to the stair should use this placement as their relative placement. Geometric Representation If the IfcStair has components (referenced by SELF\\IfcObject.IsDecomposedBy) then no independent geometric representation shall defined for the IfcStair. The IfcStair is then geometrically represented by the geometric representation of its components. The components are accessed via SELF\\IfcObject.IsDecomposedBy[1].RelatedObjects. If the IfcStair has no components defined (empty set of SELF\\IfcObject.IsDecomposedBy) then the IfcStair may be represented by an IfcShapeRepresentation with the RepresentationType = 'Brep'. Illustration:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcstair.htm"
|
|
},
|
|
"IfcStairFlight": {
|
|
"attributes": {
|
|
"NumberOfRiser": "Number of the risers included in the stair flight.",
|
|
"NumberOfTreads": "Number of treads included in the stair flight.",
|
|
"RiserHeight": "Vertical distance from tread to tread. The riser height is supposed to be equal for all stairs in a stair flight.",
|
|
"TreadLength": "Horizontal distance from the front to the back of the tread. The tread length is supposed to be equal for all steps of the stair flight."
|
|
},
|
|
"description": "Assembly of building components in a single \"run\" of stair steps (not interrupted by a landing). The stair steps and any stringers are included in this object. A winder is regarded as part of a stair flight. An IfcStairFlight is normally aggregated by a stair (IfcStair) through the IfcRelAggregates relationship, the stair flight is then included in the set of IfcRelAggregates.RelatedObjects. An IfcStairFlight normally connects the floor slab of zero to two different storeys (or partial storeys) within a building. The connection relationship between the IfcStairFlight and the IfcSlab is expressed using the IfcRelConnectsElements relationship. *Property Set Use Definition*: The property sets relating to the IfcStairFlight are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcStairFlight are part of this IFC release: - Pset_StairFlightCommon: common property set for all stair flight occurrences *Geometry Use Definitions*: The geometric representation of IfcStairFlight is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local placement The local placement for IfcStairFlight is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level. - If the IfcStairFlight, however, is used by an IfcStair, and this container class defines its own local placement, then the PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the aggregate. Standard Geometric Representation The standard geometric representation of IfcStair is defined using the following multiple shape representations for its definition: - WalkingLine: A two-dimensional open curve (IfcBoundedCurve) defining the walking line for the stair flight. - Boundary: A two-dimensional closed curve (IfcBoundedCurve) defining the boundary of the stair flight. - Body: A Brep representation (subtypes of IfcManifoldSolidBrep) defining the 3D shape of the stair flight First Representation: WalkingLine The walking line is represented by a two-dimensional open curve within a particular shape representation. The curve is directed (direction has to be interpreted as specified at the subtypes of IfcCurve). Second Representation: Boundary The flight boundary is represented by a two-dimensional closed curve within a particular shape representation. Third Representation: Body The three dimensional shape of the flight is represented by a Brep representation.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcstairflight.htm"
|
|
},
|
|
"IfcStairFlightType": {
|
|
"description": "The element type (IfcStairFlightType) defines a list of commonly shared property set definitions of a stair flight and an optional set of product representations. It is used to define an stair flight specification (i.e. the specific product information, that is common to all occurrences of that product type). A stair flight type is used to define the common properties of a certain type of a stair flight that may be applied to many instances of that type to assign a specific style. Stair flight types may be exchanged without being already assigned to occurrences. The occurrences of the IfcStairFlightType are represented by instances of IfcStairFlight.",
|
|
"predefined_types": {
|
|
"CURVED": "A stair flight with a curved walking line.",
|
|
"FREEFORM": "A stair flight with a free form walking line (and outer boundaries).",
|
|
"NOTDEFINED": "Undefined stair flight.",
|
|
"SPIRAL": "A stair flight with a circular or elliptic walking line.",
|
|
"STRAIGHT": "A stair flight with a straight walking line.",
|
|
"USERDEFINED": "User-defined stair flight.",
|
|
"WINDER": "A stair flight with a walking line including straight and curved sections."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcstairflighttype.htm"
|
|
},
|
|
"IfcStructuralAction": {
|
|
"attributes": {
|
|
"CausedBy": "Optional reference to an instance of IfcStructuralReaction representing a result of another structural analysis model which creates this action upon the considered structural analysis model.",
|
|
"DestabilizingLoad": "Indicates if this action may cause a stability problem. If it is 'FALSE', no further investigations regarding stability problems are necessary."
|
|
},
|
|
"description": "A structural action is a structural activity that acts upon a structural item or building element. Example: The following figure illustrates the rationale for the use of the attribute 'CausedBy' for the representation of the dependencies between actions and action results. The given simplified structure contains two mechanical models that are analyzed independently, but do influence each other.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralaction.htm"
|
|
},
|
|
"IfcStructuralActivity": {
|
|
"attributes": {
|
|
"AppliedLoad": "Reference to the load resource, which is used to define the load type, direction and load values. The specified load types are provided in the IfcStructuralLoadResource presented at the end of this document.",
|
|
"AssignedToStructuralItem": "References to the IfcRelConnectsStructuralActivity relationship by which activities can be associated to structural representations.",
|
|
"GlobalOrLocal": "Indicates if the load values are defined by using the local coordinate system or the global project coordinate system."
|
|
},
|
|
"description": "The abstract entity IfcStructuralActivity combines the definition of actions (such as forces, displacement, etc) and reactions (supports and deformations) which are specified by using the basic load definitions from the_IfcStructuralLoadResource_. It also uses the inherited capabilities for the definition of a location and a local coordinate system. The differentiation between actions and reactions is realized by instantiating objects either from subclasses of IfcStructuralAction or IfcStructuralReaction respectively. They inherit commonly needed attributes from the abstract superclass IfcStructuralActivity. Possible dependencies between actions and reactions must be explicitly captured. The use of the location and local coordinate system, given by ObjectPlacement, is optional as it is not always needed or useful. In addition the IfcStructuralActivity defines the relation needed to associate actions and/or reactions to the IfcStructuralItem to which it applies.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralactivity.htm"
|
|
},
|
|
"IfcStructuralAnalysisModel": {
|
|
"attributes": {
|
|
"HasResults": "References to all result groups available for this structural analysis model.",
|
|
"LoadedBy": "References to all load groups to be analyzed.",
|
|
"OrientationOf2DPlane": "If the selected model type (PredefinedType) describes a 2D system the orientation is needed to define the upright direction to the focused plane (z-axes). This is needed because all data for the structural analysis model (structural members, structural activities) are defined by using 3-D space. The orientation is given in relation to the coordinate system of the project. By 3D systems this value is not asserted."
|
|
},
|
|
"description": "The IfcStructuralAnalysisModel is used to assemble all information needed to represent a structural analysis model. It encompasses certain general properties (such as analysis type), references to all contained structural members, structural supports or connecting members, the connection properties, as well as loads and the respective load results. Important functionalities for the description of an analysis model are derived from existing IFC entities: - From IfcSystem it inherits the ability to couple the analysis model via IfcRelServicesBuildings to one or more IfcBuildings as necessary. - From IfcGroup it inherits the inverse attribute IsGroupedBy, pointing to the relationship class IfcRelAssignsToGroup. This allows to group structural members (instances of IfcStructuralMember), and supports (instances of IfcStructuralConnection) which belong to a specific analysis model. NOTE: Loads (as instances of IfcStructuralAction) are not included through IsGroupedBy. Loads are assigned through the LoadedBy attribute relationship, using load groups as a grouping mechanism. Only top-level load groups should be referenced via LoadedBy. NOTE: Results (as instances of IfcStructuralReaction) are not included through IsGroupedBy. Results are assigned through the HasResults attribute relationship, using result groups as a grouping mechanism. - From IfcObject it inherits the inverse attribute IsDecomposedBy pointing to the relationship class IfcRelNests. It provides the hierarchy between the separate (partial) analysis models.",
|
|
"predefined_types": {
|
|
"IN_PLANE_LOADING_2D": "",
|
|
"LOADING_3D": "",
|
|
"NOTDEFINED": "",
|
|
"OUT_PLANE_LOADING_2D": "",
|
|
"USERDEFINED": ""
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralanalysismodel.htm"
|
|
},
|
|
"IfcStructuralConnection": {
|
|
"attributes": {
|
|
"AppliedCondition": "Optional reference to an instance of IfcBoundaryCondition which defines the support condition of this 'connection'.",
|
|
"ConnectsStructuralMembers": "References to the IfcRelConnectsStructuralMembers relationship by which structural members can be associated to structural connections."
|
|
},
|
|
"description": "The abstract entity IfcStructuralConnection is the superclass of entities representing structural supports or connecting elements (nodes). Point connections, curve connections and surface connections are supported.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralconnection.htm"
|
|
},
|
|
"IfcStructuralConnectionCondition": {
|
|
"attributes": {
|
|
"Name": "Optionally defines a name for this connection condition."
|
|
},
|
|
"description": "Instances of the entity IfcStructuralConnectionCondition or its respective subclasses shall be used to describe more rarely needed connection properties.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralconnectioncondition.htm"
|
|
},
|
|
"IfcStructuralCurveConnection": {
|
|
"description": "Instances of the entity IfcStructuralCurveConnection shall be used to describe 'linear nodes' or 'linear supports', i.e. lines where two or more face members (walls, plates) are joined. All values defined by AppliedCondition are given within a coordinate system which is derived from the local coordinate system defined by this instance.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralcurveconnection.htm"
|
|
},
|
|
"IfcStructuralCurveMember": {
|
|
"description": "Definition from IAI: Instances of the entity IfcStructuralCurveMember shall be used to describe linear structural elements. Profile and material properties are defined by using objectified relationships: - The material properties are defined by IfcMechanicalMaterialProperties (and subtypes), they are connected through IfcMaterial and IfcRelAssociatesMaterial and are accessible via the inherited inverse relationship HasAssociations. - The profile properties are defined by IfcMechanicalProfileProperties (and subtypes), they are connected through IfcRelAssociatesProfileProperties and are accessible via the inherited inverse relationship HasAssociations. *Use Definition* *Topology Use Definition* Instances of IfcStructuralCurveMember shall have a topology representation. It includes a placement and a product representation. The IfcProductRepresentation shall be given by an item of Representations being of type \"IfcTopologyRepresentation\". Placement The placement for IfcStructuralCurveMember is determined at its supertype IfcProduct. It is defined by the optional IfcObjectPlacement, referenced by ObjectPlacement at IfcProduct, which establishes, if given, the object coordinate system that is referenced by all topological representations of that product. - If the ObjectPlacement attribute is omitted, then all topological representations are given directly in world coordinates. This is the preferred representation. - If the ObjectPlacement attribute is provided, then it establishes an object coordinate system for all topological representations which are given object coordinates. If the PlacementRelTo relationship of IfcLocalPlacement is omitted, the object coordinate system is established within the world coordinate system. If the PlacementRelTo relationship of IfcLocalPlacement is given, it shall point to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. Topology Representation Instances of IfcStructuralCurveMember shall have a topology representation given by an edge with an optional additional geometric representation of the included curve. It can be provided by either - IfcEdge - IfcOrientedEdge - IfcEdgeCurve which should be the single item of IfcTopologyRepresentation.Items. The IfcEdge might be referenced by two or many IfcSubedge, representing sections of the IfcStructuralCurveMember with changing properties. See subtype IfcStructuralCurveMemberVarying for the use definition.",
|
|
"predefined_types": {
|
|
"CABLE": "",
|
|
"COMPRESSION_MEMBER": "",
|
|
"NOTDEFINED": "",
|
|
"PIN_JOINED_MEMBER": "",
|
|
"RIGID_JOINED_MEMBER": "",
|
|
"TENSION_MEMBER": "",
|
|
"USERDEFINED": ""
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralcurvemember.htm"
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},
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"IfcStructuralCurveMemberVarying": {
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"description": "Definition from IAI: Instances of the entity IfcStructuralCurveMemberVarying shall be used to describe linear structural elements with varying profile properties. The varying profile properties are assigned through the IfcRelAssociatesProfileProperties with an additional link to the IfcShapeAspect, which relates the profile properties to the different vertices of the structural curve member. *Use Definition* *Topology Use Definition* Instances of IfcStructuralCurveMemberVarying shall have a topology representation. It includes a placement and a product representation. The IfcProductRepresentation shall be given by an item of Representations being of type \"IfcTopologyRepresentation\". The guidelines on using the location and topological representation capabilities are identical with the supertype IfcStructuralCurveMember. The additional requirement is that if the varying profile not only has different (morphing) profiles at the start and end edge, then the IfcTopologyRepresentation.Item[1]_shall be an _IfcEdge (or IfcEdgeCurve, IfcOrientedEdge) that is referenced by the Parent attribute of at least two IfcSubedge's. *Shape Aspect Use Definition* The attribute HasAssociations references a set of IfcRelAssociatesProfileProperties, each referring to an IfcShapeAspect, that has a list of ShapeRepresentations. Each individual IfcShapeRepresentation within that list shall have a single (or two) item(s) within its list of Items. The type of the item shall be: - IfcVertexPoint It references either a start or an end vertex (or both) to which the profile properties apply.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralcurvemembervarying.htm"
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},
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"IfcStructuralItem": {
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"attributes": {
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"AssignedStructuralActivity": "Inverse relationship to all structural activities (i.e. to actions or reactions) which are assigned to this structural member."
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},
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"description": "**Definition from IAI:** The abstract entity_IfcStructuralItem_ covers structural members and structural connections. It defines the relation needed to associate structural actions to structural members and connections. ****Topology Use Definition**** Instances of IfcStructuralItem shall have a topology representation. It includes a placement and a product representation. The IfcProductRepresentation shall be given by an item of Representations being of type \"IfcTopologyRepresentation\". **Local Placement** All IfcStructuralItem_s which are grouped within a common _IfcStructuralAnalysisModel should have equal object placements. Placement within the world coordinate system of the project is the easiest way to ensure this, especially if structural items belong to more than one analysis model. All geometric entities within the topological representation (such as IfcVertexPoint, IfcEdgeCurve, or IfcFaceSurface) are founded in the object coordinate system established by ObjectPlacement. in Release IFC2x Edition 2.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralitem.htm"
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},
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"IfcStructuralLinearAction": {
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"attributes": {
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"ProjectedOrTrue": "Defines if the load values are given by using the length of the member on which they act (true length) or by using the projected length resulting from the loaded member and the global project coordinate system. It is only considered if the global project coordinate system is used, and if the action is of type IfcStructuralLinearAction or IfcStructuralPlanarAction."
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},
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"description": "Instances of the entity IfcStructuralLinearAction are used to define constant linear actions. Structural loads applicable to linear actions are IfcStructuralLoadLinearForce and IfcStructuralLoadTemperature. The structural load, defining the linear action is given by the attribute AppliedLoad at the supertype IfcStructuralActivity. The coordinate system, in which the AppliedLoad is defined is given by the attribute ObjectPlacement at the supertype IfcProduct. *Topology Use Definition* Special case: If applied to building elements, placement and representation of the structural action are often implied by those of the building elements and are therefore optional for the actions. Standard case: If applied to structural items, instances of IfcStructuralLinearAction shall have a topology representation. It includes a placement and a product representation. The IfcProductRepresentation shall be given by an item of Representations being of type \"IfcTopologyRepresentation\". Placement The placement for IfcStructuralLinearAction is determined at its supertype IfcProduct. It is defined by the optional IfcObjectPlacement, referenced by ObjectPlacement at IfcProduct, which establishes, if given, the object coordinate system that is referenced by the applied load. - If the ObjectPlacement attribute is omitted, then all topological representations are given directly in world coordinates. - If the ObjectPlacement attribute is provided, then it establishes an object coordinate system for all topological representations which are given object coordinates. If the PlacementRelTo relationship of IfcLocalPlacement is omitted, the object coordinate system is established within the world coordinate system. If the PlacementRelTo relationship of IfcLocalPlacement is given, it shall point to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. Topology Representation Instances of IfcStructuralLinearAction shall have a topology representation given by an edge with an optional additional geometric representation of the included curve. It can be provided by either - IfcEdge - IfcOrientedEdge - IfcEdgeCurve which should be the single item of IfcTopologyRepresentation.Items. If the topological item is not of type IfcEdgeCurve, a line connection is assumed between the two vertices of the edge.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructurallinearaction.htm"
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},
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"IfcStructuralLinearActionVarying": {
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"attributes": {
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"SubsequentAppliedLoads": "A list containing load values which are assigned to the position defined through the shape aspect. The first load is already defined by the inherited attribute AppliedLoad and shall not be contained in this list.",
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"VaryingAppliedLoadLocation": "A shape aspect, containing a list of shape representations, each defining either one Cartesian point or one point on curve (by parameter values) which are needed to provide the positions of the VaryingAppliedLoads. The values contained in the list of IfcShapeAspect.ShapeRepresentations correspond to the values at the same position in the list VaryingAppliedLoads.",
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"VaryingAppliedLoads": "Derived list of all varying applied loads by pushing the inherited AppliedLoad value to the beginning of the list of SubsequentAppliedLoads. IfcAddToBeginOfList(SELF\\IfcStructuralActivity.AppliedLoad, SubsequentAppliedLoads)"
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},
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"description": "Instances of the entity IfcStructuralLinearActionVarying are used to define varying linear actions. IfcStructuralLinearActionVarying inherits the needed attributes and applicable structural load types from its superclass IfcStructuralLinearAction. *Topology Use Definition* Instances of IfcStructuralLinearActionVarying shall have a topology representation. It includes a placement and a product representation. The IfcProductRepresentation shall be given by an item of Representations being of type \"IfcTopologyRepresentation\". The definition of the topological representation is given at the supertype IfcStructuralLinearAction. One additional constraint applies: - The topology representation has to be given by an IfcEdgeCurve to provide a parameterized geometric representation of the curve between both vertices. This parameterization is needed for the location of the varying loads. *Shape Aspect Use Definition* The attribute VaryingAppliedLoadLocation reference a shape aspect, that has a list of ShapeRepresentations. Each individual IfcShapeRepresentation within that list shall have a single item within its list of Items. The type of the item shall be either: - IfcCartesianPoint, or - IfcPointOnCurve Each list member within the list of ShapeRepresentations corresponds to the list member (at same position) of the list VaryingAppliedLoads, and provides the position of the applied load. At least two applied load values shall be given, the distribution of the applied linear loads across the surface of the planar action is constructed by linear interpolation. The following examples shows a definition of a varying applied loads by four points on curve. Example:",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructurallinearactionvarying.htm"
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},
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"IfcStructuralLoad": {
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"attributes": {
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"Name": "Optionally defines a name for this load."
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},
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"description": "The abstract entity IfcStructuralLoad is the supertype of all loads which can be defined (actions or reactions, as well as dynamic or static). Subtypes of this entity are an important part of the definition of actions and reactions. They are used to specify the load values. The location and the used coordinate system are defined by instances of IfcStructuralActivity which reference an instance of IfcStructuralLoad for the definition of the load values. This offers the possibility to use instances of IfcStructuralLoad by several instances of IfcStructuralActivity.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralload.htm"
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},
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"IfcStructuralLoadGroup": {
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"attributes": {
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"ActionSource": "Source of actions in the group. Normally needed if 'PredefinedType' specifies a LOAD_CASE.",
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"ActionType": "Type of actions in the group. Normally needed if 'PredefinedType' specifies a LOAD_COMBINATION_GROUP.",
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"Coefficient": "Load factor. If omitted, a factor is not yet known or not specified. A load factor of 1.0 shall be explicitly exported as Coefficient = 1.0.",
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"LoadGroupFor": "Analysis models in which this load group is used.",
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"Purpose": "Description of the purpose of this instance. Among else, possible values of the Purpose of load combinations are 'SLS', 'ULS', 'ALS' to indicate serviceability, ultimate, or accidental limit state.",
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"SourceOfResultGroup": "Results which were computed using this load group."
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},
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"description": "The entity IfcStructuralLoadGroup is used to structure the physical impacts. By using the grouping features inherited from IfcGroup, instances of IfcStructuralAction (or its subclasses) and of IfcStructuralLoadGroup can be used to define load groups, load cases and load combinations. An optional coefficient can be provided to represent safety factors known from several codes of practice. (see also IfcLoadGroupTypeEnum) Use Definition The following example illustrates the use of this entity class for the different load group types. Common to all these types is the application of the same grouping mechanism (via IfcGroup) for the specification of the needed groups that may optionally contain an additional load factor (attribute Coefficient). The calculation of internal forces and the provision of safety coefficients is dependent on the building codes used; therefore only a generic representation of load groups is provided by this entity class.",
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"predefined_types": {
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"LOAD_CASE": "Groups LOAD_GROUPs and instances of subtypes of _IfcStructuralAction_.\n It should be used as a container for loads with the same origin.",
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"LOAD_COMBINATION": "An intermediate level between LOAD_CASE and LOAD_COMBINATION. This level is obsolete and deprecated. Before the introduction of _IfcRelAssignsToGroupByFactor_, the purpose of this level was to provide a factor with which one or more LOAD_CASEs occur in a LOAD_COMBINATION.",
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"LOAD_COMBINATION_GROUP": "",
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"LOAD_GROUP": "Groups instances of subtypes of _IfcStructuralAction_. It shall be used as a container for loads grouped together for specific purposes, such as loads which are part of a special load pattern.",
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"NOTDEFINED": "The grouping level is not yet known.",
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"USERDEFINED": "A grouping level which does not follow the standard hierarchy of load group types."
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},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralloadgroup.htm"
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},
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"IfcStructuralLoadLinearForce": {
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"attributes": {
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"LinearForceX": "Linear force value in x-direction.",
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"LinearForceY": "Linear force value in y-direction.",
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"LinearForceZ": "Linear force value in z-direction.",
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"LinearMomentX": "Linear moment about the x-axis.",
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"LinearMomentY": "Linear moment about the y-axis.",
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"LinearMomentZ": "Linear moment about the z-axis."
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},
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"description": "An instance of the entity IfcStructuralLoadLinearForce shall be used to define actions on curves. All values are given within the chosen coordinate system of the 'activity element' (subtypes of IfcStructuralActivity), either the local coordinate system of the activity element or the global project coordinate system which is referenced by the activity element as its geometric representation context. The units of the force and moment values are given within the global unit assignment (IfcUnitAssignment).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadlinearforce.htm"
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},
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"IfcStructuralLoadPlanarForce": {
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|
"attributes": {
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|
"PlanarForceX": "Planar force value in x-direction.",
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|
"PlanarForceY": "Planar force value in y-direction.",
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|
"PlanarForceZ": "Planar force value in z-direction."
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},
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"description": "An instance of the entity IfcStructuralLoadPlanarForce shall be used to define actions on faces. All values are given within the chosen coordinate system of the 'activity element' (subtypes of IfcStructuralActivity), either the local coordinate system of the activity element or the global project coordinate system which is referenced by the activity element as its geometric representation context. The units of the force values are given within the global unit assignment (IfcUnitAssignment).",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadplanarforce.htm"
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},
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|
"IfcStructuralLoadSingleDisplacement": {
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"attributes": {
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"DisplacementX": "Displacement in x-direction.",
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"DisplacementY": "Displacement in y-direction.",
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|
"DisplacementZ": "Displacement in z-direction.",
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"RotationalDisplacementRX": "Rotation about the x-axis.",
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"RotationalDisplacementRY": "Rotation about the y-axis.",
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"RotationalDisplacementRZ": "Rotation about the z-axis."
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},
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"description": "Instances of the entity IfcStructuralLoadSingleDisplacement shall be used to define the displacements of an action operating on a single point. All values are given within the chosen coordinate system of the 'activity element' (subtypes of IfcStructuralActivity), either the local coordinate system of the activity element or the global project coordinate system which is referenced by the activity element as its geometric representation context. The units of the displacement and rotation values are given within the global unit assignment (IfcUnitAssignment).",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadsingledisplacement.htm"
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|
},
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|
"IfcStructuralLoadSingleDisplacementDistortion": {
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"attributes": {
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"Distortion": "The distortion curvature given to the displacement load."
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},
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"description": "Instances of the entity IfcStructuralLoadSingleForceWarping, as a subtype of IfcStructuralLoadSingleForce, shall be used to define an action operation on a single point. In addition to forces and moments defined by its supertype a warping moment can be defined. All values are given within the chosen coordinate system of the 'activity element' (subtypes of IfcStructuralActivity), either the local coordinate system of the activity element or the global project coordinate system which is referenced by the activity element as its geometric representation context. The units of the displacement and rotation values are given within the global unit assignment (IfcUnitAssignment).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadsingledisplacementdistortion.htm"
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},
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|
"IfcStructuralLoadSingleForce": {
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"attributes": {
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"ForceX": "Force value in x-direction.",
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"ForceY": "Force value in y-direction.",
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"ForceZ": "Force value in z-direction.",
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|
"MomentX": "Moment about the x-axis.",
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"MomentY": "Moment about the y-axis.",
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"MomentZ": "Moment about the z-axis."
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|
},
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|
"description": "Instances of the entity IfcStructuralLoadSingleForce shall be used to define the forces and moments of an action operating on a single point. All values are given within the chosen coordinate system of the 'activity element' (subtypes of IfcStructuralActivity), either the local coordinate system of the activity element or the global project coordinate system which is referenced by the activity element as its geometric representation context. The units of the force and moment values are given within the global unit assignment (IfcUnitAssignment).",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadsingleforce.htm"
|
|
},
|
|
"IfcStructuralLoadSingleForceWarping": {
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|
"attributes": {
|
|
"WarpingMoment": "The warping moment at the point load."
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|
},
|
|
"description": "Instances of the entity IfcStructuralLoadSingleForceWarping, as a subtype of IfcStructuralLoadSingleForce, shall be used to define an action operation on a single point. In addition to forces and moments defined by its supertype a warping moment can be defined. All values are given within the chosen coordinate system of the 'activity element' (subtypes of IfcStructuralActivity), either the local coordinate system of the activity element or the global project coordinate system which is referenced by the activity element as its geometric representation context. The units of the force and moment values are given within the global unit assignment (IfcUnitAssignment).",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadsingleforcewarping.htm"
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},
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|
"IfcStructuralLoadStatic": {
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|
"description": "The abstract entity IfcStructuralLoadStatic is the supertype of all static loads (actions or reactions) which can be defined.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadstatic.htm"
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|
},
|
|
"IfcStructuralLoadTemperature": {
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"attributes": {
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"DeltaT_Constant": "Temperature change which is applied to the complete section of the structural member. A positive value describes an increase in temperature.",
|
|
"DeltaT_Y": "Temperature change which is applied to the outer fiber of the positive Y-direction. A positive value describes an increase in temperature.",
|
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"DeltaT_Z": "Temperature change which is applied to the outer fiber of the positive Z-direction. A positive value describes an increase in temperature."
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|
},
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"description": "An instance of the entity IfcStructuralLoadTemperature shall be used to define actions which are caused by a temperature change. The change of temperature is given with a constant value which is applied to the complete section and values for the outer fibre of the positive Y and Z directions. All values are given within the chosen coordinate system of the 'activity element' (subtypes of IfcStructuralActivity), either the local coordinate system of the activity element or the global project coordinate system which is referenced by the activity element as its geometric representation context. The unit of the temperature values are given within the global unit assignment (IfcUnitAssignment).",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadtemperature.htm"
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},
|
|
"IfcStructuralMember": {
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"attributes": {
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"ConnectedBy": "Inverse relationship to all structural connections (i.e. to supports or connecting elements) which are defined for this structural member.",
|
|
"ReferencesElement": "Inverse link to the relationship object, that connects a physical element to this structural member (the element of which this structural member is the analytical idealization)."
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|
},
|
|
"description": "Definition from IAI: The abstract entity IfcStructuralMember is the superclass of all structural elements representing the structural behavior of building elements. A further differentiation is made for structural curve members and structural face members (see IfcStructuralCurveMember and IfcStructuralFaceMember). Structural members can have - a material definition, using IfcStructuralMember o-- IfcRelAssociatesMaterial --o IfcMaterial - a profile definition, using IfcStructuralMember o-- IRelAssociatesProfileProperties --o IfcProfileProperties - a parent analysis model, using IfcStructuralMember o-- IfcRelAssignsToGroup --o IfcStructuralAnalysisModel *Use Definition*",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralmember.htm"
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|
},
|
|
"IfcStructuralPlanarAction": {
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"attributes": {
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|
"ProjectedOrTrue": "Defines if the load values are given by using the length of the member on which they act (true length) or by using the projected length resulting from the loaded member and the global project coordinate system. It is only considered if the global project coordinate system is used, and if the action is of type IfcStructuralLinearAction or IfcStructuralPlanarAction."
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},
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"description": "Instances of the entity IfcStructuralPlanarAction are used to define constant planar actions. Structural loads applicable to planar actions are IfcStructuralLoadPlanarForce and IfcStructuralLoadTemperature. The structural load, defining the planar action is given by the attribute AppliedLoad at the supertype IfcStructuralActivity. The coordinate system, in which the AppliedLoad is defined is given by the attribute ObjectPlacement at the supertype IfcProduct. *Topology Use Definition* Special case: If applied to building elements, placement and representation of the structural action are often implied by those of the building elements and are therefore optional for the actions. Standard case: If applied to structural items, instances of IfcStructuralPlanarAction shall have a topology representation. It includes a placement and a product representation. The IfcProductRepresentation shall be given by an item of Representations being of type \"IfcTopologyRepresentation\". Placement The placement for IfcStructuralPlanarAction is determined at its supertype IfcProduct. It is defined by the optional IfcObjectPlacement, referenced by ObjectPlacement at IfcProduct, which establishes, if given, the object coordinate system that is referenced by the applied load. - If the ObjectPlacement attribute is omitted, then all topological representations are given directly in world coordinates. - If the ObjectPlacement attribute is provided, then it establishes an object coordinate system for all topological representations which are given object coordinates. If the PlacementRelTo relationship of IfcLocalPlacement is omitted, the object coordinate system is established within the world coordinate system. If the PlacementRelTo relationship of IfcLocalPlacement is given, it shall point to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. Topology Representation Instances of IfcStructuralPlanarAction shall have a topology representation given by a face with an optional additional geometric representation of the included surface. It can be provided by either - IfcFace - IfcFaceSurface which should be the single item of IfcTopologyRepresentation.Items.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralplanaraction.htm"
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},
|
|
"IfcStructuralPlanarActionVarying": {
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|
"attributes": {
|
|
"SubsequentAppliedLoads": "A list containing load values which are assigned to the position defined through the shape aspect. The first load is already defined by the inherited attribute AppliedLoad and shall not be contained in this list.",
|
|
"VaryingAppliedLoadLocation": "A shape aspect, containing a list of shape representations, each defining either one Cartesian point or one point on curve (by parameter values) which are needed to provide the positions of the VaryingAppliedLoads. The values contained in the list of IfcShapeAspect.ShapeRepresentations correspond to the values at the same position in the list VaryingAppliedLoads.",
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|
"VaryingAppliedLoads": "Derived list of all varying applied loads by pushing the inherited AppliedLoad value to the beginning of the list of SubsequentAppliedLoads. IfcAddToBeginOfList(SELF\\IfcStructuralActivity.AppliedLoad, SubsequentAppliedLoads)"
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|
},
|
|
"description": "Instances of the entity IfcStructuralPlanarActionVarying are used to define varying planar actions. IfcStructuralPlanarActionVarying inherits the needed attributes and applicable structural load types from its superclass IfcStructuralLinearAction. *Topology Use Definition* Instances of IfcStructuralPlanarActionVarying shall have a topology representation. It includes a placement and a product representation. The IfcProductRepresentation shall be given by an item of Representations being of type \"IfcTopologyRepresentation\". The definition of the topological representation is given at the supertype IfcStructuralPlanarAction. *Shape Aspect Use Definition* The attribute VaryingAppliedLoadLocation reference a shape aspect, that has a list of ShapeRepresentations. Each individual IfcShapeRepresentation within that list shall have a single item within its list of Items. The type of the item shall be either: - IfcCartesianPoint, or - IfcPointOnSurface Each list member within the list of ShapeRepresentations corresponds to the list member (at same position) of the list VaryingAppliedLoads, and provides the position of the applied load. At least three applied load values shall be given, the distribution of the applied planar loads across the surface of the planar action is constructed by triangulation. The following examples shows a definition of a varying applied loads by four Cartesian points.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralplanaractionvarying.htm"
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|
},
|
|
"IfcStructuralPointAction": {
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|
"description": "Instances of the entity IfcStructuralPointAction are used to define point actions. Structural loads applicable to point actions are IfcStructuralLoadSingleForce (and subtype), and IfcStructuralLoadSingleDisplacement (and subtype). The structural load, defining the point action is given by the attribute AppliedLoad at the supertype IfcStructuralActivity. The coordinate system, in which the AppliedLoad is defined is given by the attribute ObjectPlacement at the supertype IfcProduct. *Topology Use Definition* Special case: If applied to building elements, placement and representation of the structural action are often implied by those of the building elements and are therefore optional for the actions. Standard case: If applied to structural items, instances of IfcStructuralPointAction shall have a topology representation. It includes a placement and a product representation. The IfcProductRepresentation shall be given by an item of Representations being of type \"IfcTopologyRepresentation\". Placement The placement for IfcStructuralPointAction is determined at its supertype IfcProduct. It is defined by the optional IfcObjectPlacement, referenced by ObjectPlacement at IfcProduct, which establishes, if given, the object coordinate system that is referenced by the applied load. - If the ObjectPlacement attribute is omitted, then all topological representations are given directly in world coordinates. - If the ObjectPlacement attribute is provided, then it establishes an object coordinate system for all topological representations which are given object coordinates. If the PlacementRelTo relationship of IfcLocalPlacement is omitted, the object coordinate system is established within the world coordinate system. If the PlacementRelTo relationship of IfcLocalPlacement is given, it shall point to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. Topology Representation Instances of IfcStructuralPointAction may have a topology representation given by a vertex with an optional additional geometric representation by a Cartesian point. It can be provided by either - IfcVertex - IfcVertexPoint which should be the single item of IfcTopologyRepresentation.Items. If no topology representation is given, the location of the placement is taken as the vertex at which the point actions acts upon the structural item.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralpointaction.htm"
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|
},
|
|
"IfcStructuralPointConnection": {
|
|
"description": "Instances of the entity IfcStructuralPointConnection shall be used to describe structural nodes or point supports. All values defined by AppliedCondition are given within the local coordinate system, which is defined by this instance.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralpointconnection.htm"
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|
},
|
|
"IfcStructuralPointReaction": {
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"description": "Instances of the entity IfcStructuralPointReaction are used to define point reactions. IfcStructuralPointReaction inherits all needed attributes from its superclass IfcStructuralReaction. The structural load, defining the point reaction is given by the attribute AppliedLoad at the supertype IfcStructuralActivity. The coordinate system, in which the AppliedLoad is defined is given by the attribute ObjectPlacement at the supertype IfcProduct. *Topology Use Definition* Instances of IfcStructuralPointReaction shall have a topology representation. It includes a placement and a product representation. The IfcProductRepresentation shall be given by an item of Representations being of type \"IfcTopologyRepresentation\". Placement The placement for IfcStructuralPointReaction is determined at its supertype IfcProduct. It is defined by the optional IfcObjectPlacement, referenced by ObjectPlacement at IfcProduct, which establishes, if given, the object coordinate system that is referenced by the applied load. - Ifc the ObjectPlacement attribute is omitted, then all topological representations are given directly in world coordinates. - Ifc the ObjectPlacement attribute is provided, then it establishes an object coordinate system for all topological representations which are given object coordinates. If the PlacementRelTo relationship of IfcLocalPlacement is omitted, the object coordinate system is established within the world coordinate system. If the PlacementRelTo relationship of IfcLocalPlacement is given, it shall point to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. Topology Representation Instances of IfcStructuralPointReaction may have a topology representation given by a vertex with an optional additional geometric representation by a Cartesian point. It can be provided by either - IfcVertex - IfcVertexPoint which should be the single item of IfcTopologyRepresentation.Items. If no topology representation is given, the location of the placement is taken as the vertex at which the point reaction takes place.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralpointreaction.htm"
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},
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"IfcStructuralProfileProperties": {
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"attributes": {
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"CentreOfGravityInX": "Location of the profile's centre of gravity in the geometric X direction. The _CentreOfGravityInX_ is measured in the global length unit as defined at _IfcProject.UnitsInContext_.",
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"CentreOfGravityInY": "Location of the profile's centre of gravity in the geometric Y direction. The _CentreOfGravityInY_ is measured in the global length unit as defined at _IfcProject.UnitsInContext_.",
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"MaximumSectionModulusY": "Bending resistance about Y-axis of profile coordinate system at maximum Z-ordinate. Usually measured in [mm3].",
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"MaximumSectionModulusZ": "Bending resistance about Z-axis of profile coordinate system at maximum Y-ordinate. Usually measured in [mm3].",
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"MinimumSectionModulusY": "Bending resistance about Y-axis of profile coordinate system at minimum Z-ordinate. Usually measured in [mm3].",
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"MinimumSectionModulusZ": "Bending resistance about Z-axis of profile coordinate system at minimum Y-ordinate. Usually measured in [mm3].",
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|
"MomentOfInertiaY": "Moment of inertia about Y-axis of profile coordinate system. Usually measured in [mm4].",
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"MomentOfInertiaYZ": "Moment of inertia about Y and Z-axes of profile coordinate system. Usually measured in [mm4].",
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"MomentOfInertiaZ": "Moment of inertia about Z-axis of profile coordinate system. Usually measured in [mm4].",
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"ShearCentreY": "Location of the profile's shear centre in the structural Y direction. Mapped on IFC profile coordinate system it is the offset in the direction of the negative X axis. The offset is relative to the center of gravity. The _ShearCentreY_ is measured in the global length unit as defined at _IfcProject.UnitsInContext_.",
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"ShearCentreZ": "Location of the profile's shear centre in the structural Z direction. Mapped on IFC profile coordinate system it is the offset in the direction of the negative Y axis. The offset is relative to the center of gravity. The _ShearCentreZ_ is measured in the global length unit as defined at _IfcProject.UnitsInContext_.",
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"ShearDeformationAreaY": "Area of the profile for calculating the shear deformation for a shear force parallel to the profile's Y-axis. Usually measured in [mm2].",
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"ShearDeformationAreaZ": "Area of the profile for calculating the shear deformation for a shear force parallel to the profile's Z-axis. Usually measured in [mm2].",
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"TorsionalConstantX": "Torsional constant about X-axis of profile coordinate system. Usually measured in [mm4].",
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"TorsionalSectionModulus": "Torsional resistance (about the profiles X-axis). Usually measured in [mm3].",
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"WarpingConstant": "Warping constant of the profile for torsional action. Usually measured in [mm6]."
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},
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"description": "Definition from IAI: This is a collection of structural properties applicable to all linear structural members having a profile definition. For the structural profile properties a further material dependent specialization is given for taking into account specific profile properties applicable only in the context of a specific building material. The center of gravity is measured from the origin of the geometric profile definition (see subtypes of IfcProfileDef). The CentreOfGravityInX defines the distance along the geometric x axis of the geometric profile definition, the CentreOfGravityInY defines the distance along the geometric y axis. - For parameterized profiles: Center of gravity is measured from the center of the profile definition, which is the center of the bounding box of that profile geometry. - For arbitrary profiles: Center of gravity is measured from the 0.,0. local origin of the underlying 2D coordinate system of the explicit profile definition. The shear center is measured from the gravity center and is given in the structural coordinates, defined by: * origin = center of gravity * y axis = negative x axis of the geometric coordinate system * z axis = negative y axis of the geometric coordinate system Illustration:",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofilepropertyresource/lexical/ifcstructuralprofileproperties.htm"
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},
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"IfcStructuralReaction": {
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"attributes": {
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"Causes": "Optional reference to instances of IfcStructuralAction which directly depend on this reaction. This reference is only needed if dependencies between structural analysis models must be captured."
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},
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"description": "A structural reaction is a structural activity that results from a structural action imposed to a structural item or building element. A support is an example for a structural reaction.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralreaction.htm"
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},
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"IfcStructuralResultGroup": {
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"attributes": {
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"IsLinear": "This Boolean value allows to easily recognize if a linear analysis has been applied (allowing the superposition of analysis results), or vice versa.",
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"ResultForLoadGroup": "Reference to an instance of IfcStructuralLoadGroup for which this instance represents the result.",
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"ResultGroupFor": "Reference to an instance of IfcStructuralAnalysisModel for which this instance captures a result.",
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"TheoryType": "Specifies the analysis theory used to obtain the respective results."
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},
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|
"description": "Instances of the entity IfcStructuralResultGroup are used to group results of structural analysis calculations and to capture the connection to the underlying basic load group. The basic functionality for grouping inherited from IfcGroup is used to collect instances from IfcStructuralReaction or its respective subclasses.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralresultgroup.htm"
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},
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"IfcStructuralSteelProfileProperties": {
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"attributes": {
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"PlasticShapeFactorY": "Ratio of plastic versus elastic bending moment capacity (about y-axis) of the profile.",
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"PlasticShapeFactorZ": "Ratio of plastic versus elastic bending moment capacity (about z-axis) of the profile.",
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"ShearAreaY": "Area of the profile for calculating the shear stress for a shear force parallel to the profile's Y-axis. Usually measured in [mm2].",
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"ShearAreaZ": "Area of the profile for calculating the shear stress for a shear force parallel to the profile's Z-axis. Usually measured in [mm2]."
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|
},
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|
"description": "This is a collection of structural properties applicable to all linear structural members having a profile definition. These structural members are made of steel (or other metalic and isotropic material).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofilepropertyresource/lexical/ifcstructuralsteelprofileproperties.htm"
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},
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"IfcStructuralSurfaceConnection": {
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"description": "Instances of the entity IfcStructuralSurfaceConnection are used to describe structural supports provided by planar elements. All values defined by AppliedCondition are given within the local coordinate system, which is defined by this instance.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralsurfaceconnection.htm"
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},
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"IfcStructuralSurfaceMember": {
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"attributes": {
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"Thickness": "Defines the typically understood thickness of the structural face member, i.e. the smallest spatial dimension of the element."
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},
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"description": "Instances of the entity IfcStructuralSurfaceMember shall be used to describe planar structural elements. The material properties are defined by IfcMechanicalMaterialProperties (and subtypes) and they are connected through IfcMaterial and IfcRelAssociatesMaterial and are accessible via the inherited inverse relationship HasAssociations. *Topology Use Definition* Instances of IfcStructuralSurfaceMember shall have a topology representation. It includes a placement and a product representation. The IfcProductRepresentation shall be given by an item of Representations being of type \"IfcTopologyRepresentation\". Placement The placement for IfcStructuralSurfaceMember is determined at its supertype IfcProduct. It is defined by the optional IfcObjectPlacement, referenced by ObjectPlacement at IfcProduct, which establishes, if given, the object coordinate system that is referenced by all topological representations of that product. - If the ObjectPlacement attribute is omitted, then all topological representations are given directly in world coordinates. - If the ObjectPlacement attribute is provided, then it establishes an object coordinate system for all topological representations which are given object coordinates. If the PlacementRelTo relationship of IfcLocalPlacement is omitted, the object coordinate system is established within the world coordinate system. If the PlacementRelTo relationship of IfcLocalPlacement is given, it shall point to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. Topology Representation Instances of IfcStructuralSurfaceMember shall have a topology representation given by a face with an optional additional geometric representation of the included surface. It can be provided by either - IfcFace - IfcFaceSurface which should be the single item of IfcTopologyRepresentation.Items.",
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"predefined_types": {
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"BENDING_ELEMENT": "",
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"MEMBRANE_ELEMENT": "",
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"NOTDEFINED": "",
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"SHELL": "",
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"USERDEFINED": ""
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralsurfacemember.htm"
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},
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"IfcStructuralSurfaceMemberVarying": {
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"attributes": {
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"SubsequentThickness": "Defines the variable thickness of the structural face member using two or more subsequent and additional thickness values. The first thickness value is already given by the inherited Thickness value and shall not be included in the list.",
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"VaryingThickness": "Derived list of all varying thickness values by pushing the inherited starting thickness to the beginning of the list of SubsequentThickness. IfcAddToBeginOfList(SELF\\IfcStructuralSurfaceMember.Thickness, SubsequentThickness)",
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"VaryingThicknessLocation": "A shape aspect, containing a list of shape representations, each defining either one Cartesian point or one point on surface (by parameter values) which are needed to provide the positions of the VaryingThickness. The values contained in the list of IfcShapeAspect.ShapeRepresentations correspond to the values at the same position in the list VaryingThickness. The locations shall be along the outer bounds of the face (or surface) only."
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|
},
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"description": "Instances of the entity IfcStructuralSurfaceMemberVarying shall be used to describe planar structural elements with a varying thickness. The inherited Thickness attribute shall be given, the additional, subsequent thickness values are given by the SubsequentThickness list. The derived list VaryingThickness is created by pushing the_Thickness_ attribute at the beginning of the SubsequentThickness list. *Topology Use Definition* Instances of IfcStructuralSurfaceMemberVarying shall have a topology representation. It includes a placement and a product representation. The IfcProductRepresentation shall be given by an item of Representations being of type \"IfcTopologyRepresentation\". The guidelines on using the location and topological representation capabilities are identical with those at the supertype IfcStructuralSurfaceMember. *Shape Aspect Use Definition* The attribute VaryingThicknessLocation references a shape aspect that has a list of ShapeRepresentations. Each individual IfcShapeRepresentation within that list shall have a single item within its list of Items. The type of the item shall be either: - IfcCartesianPoint, or - IfcPointOnSurface Each list member within the list of ShapeRepresentations corresponds to the list member (at same position) of the list VaryingThickness, and provides the thickness at that location. At least three thickness values shall be given, the analytical volume is constructed by triangulation. The following example shows a definition of a varying thickness by four Cartesian points.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralsurfacemembervarying.htm"
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},
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"IfcStructuredDimensionCallout": {
|
|
"description": "The structured dimension callout represents a special type of a draughting callout, which identifies the various components of the dimension text. This is done by ensuring the correct Name attribute values for the annotation text occurrences used within the callout. Illustration from ISO 10303-202 page 497:",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcstructureddimensioncallout.htm"
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},
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"IfcStyleModel": {
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|
"description": "The IfcStyleModel represents the concept of a particular presentation style defined for a material (or other characteristic) of a product or a product component within a representation context. This representation context may (but has not to be) a geometric representation context. The IfcStyleModel can be a style representation (presentation style) of a material (via IfcMaterialDefinitionRepresentation), potentially differentiated for different representation contexts (e.g. different material hatching depending on the scale of the target representation context).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcstylemodel.htm"
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},
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|
"IfcStyledItem": {
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"attributes": {
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|
"Item": "A geometric representation item to which the style is assigned.",
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|
"Name": "The word, or group of words, by which the styled item is referred to.",
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|
"Styles": "Representation style assignments which are assigned to an item. NOTE: In current IFC release only one presentation style assignment shall be assigned."
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|
},
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|
"description": "Definition from ISO/CD 10303-46:1992: The styled item is an assignment of style for presentation to a geometric representation item as it is used in a representation. Definition from IAI: The IfcStyledItem holds presentation style information for products, either explicitly for an IfcGeometricRepresentationItem being part of an IfcShapeRepresentation assigned to a product, or by assigning presentation information to IfcMaterial being assigned as other representation for a product.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcstyleditem.htm"
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},
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|
"IfcStyledRepresentation": {
|
|
"description": "Definition from IAI: The IfcStyledRepresentation represents the concept of a styled presentation being a representation of a product or a product component, like material. within a representation context. This representation context does not need to be (but may be) a geometric representation context. A styled representation has to include one or several styled items or annotation occurrences with the associated style information (curve, symbol, text, fill area, or surface styles). It may also contain the geometric representation items that are styled.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcstyledrepresentation.htm"
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|
},
|
|
"IfcSubContractResource": {
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|
"attributes": {
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|
"JobDescription": "The description of the jobs that this subcontract should complete.",
|
|
"SubContractor": "The actor performing the role of the subcontracted resource."
|
|
},
|
|
"description": "An IfcSubContractResource is a construction resource needed in a construction process that represents a type of sub-contractor. An IfcSubContractResource can be used in cost estimating and work planning without specifying the subcontractor. However, it can be associated with an actor fulfilling the subcontractor role when detailed work planning is performed. The type of subcontractor can also be identified in a construction crew resource.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstructionmgmtdomain/lexical/ifcsubcontractresource.htm"
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},
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|
"IfcSubedge": {
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|
"attributes": {
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|
"ParentEdge": "The Edge, or Subedge, which contains the Subedge."
|
|
},
|
|
"description": "Definition from ISO/DIS 10303-42:1999(E): A subedge is an edge whose domain is a connected portion of the domain of an existing edge. The topological constraints on a subedge are the same as those on an edge. Informal propositions: - The domain of the subedge is formally defined to be the domain of the parent edge, as trimmed by the subedge start vertex and subedge end vertex. - The start vertex and end vertex shall be within the union of the domains of the vertices of the parent edge and the domain of the parent edge.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcsubedge.htm"
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},
|
|
"IfcSurface": {
|
|
"description": "Definition from ISO/CD 10303-42:1992: A surface can be envisioned as a set of connected points in 3-dimensional space which is always locally 2-dimensional, but need not be a manifold. Informal proposition: - A surface has non zero area. - A surface is arcwise connected.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcsurface.htm"
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},
|
|
"IfcSurfaceCurveSweptAreaSolid": {
|
|
"attributes": {
|
|
"Directrix": "The curve used to define the sweeping operation. The solid is generated by sweeping the SELF\\IfcSweptAreaSolid.SweptArea along the Directrix.",
|
|
"EndParam": "The parameter value on the Directrix at which the sweeping operation ends.",
|
|
"ReferenceSurface": "The surface containing the Directrix.",
|
|
"StartParam": "The parameter value on the Directrix at which the sweeping operation commences."
|
|
},
|
|
"description": "Definition from ISO/DIS 10303-42:1999(E): A surface curve swept area solid is a type of swept area solid which is the result of sweeping a face along a Directrix lying on a ReferenceSurface. The orientation of the SweptArea is related to the direction of the surface normal. The SweptArea is required to be a curve bounded surface lying in the plane z = 0 and this is swept along the Directrix in such a way that the origin of the local coordinate system used to define the SweptArea is on the Directrix and the local x-axis is in the direction of the normal to the ReferenceSurface at the current point. The resulting solid has the property that the cross section of the surface by the normal plane to the Directrix at any point is a copy of the SweptArea. The orientation of the SweptArea as it sweeps along the Directrix is precisely defined by a CartesianTransformationOperator3d with attributes: - LocalOrigin as point (0; 0; 0), - Axis1 as the normal N to the ReferenceSurface at the point of the Directrix with parameter u. - Axis3 as the direction of the tangent vector t at the point of the Directrix with parameter u. The remaining attributes are defaulted to define a corresponding transformation matrix T(u), which varies with the Directrix parameter u. The swept face is given by IfcProfileDef (or subtypes), the profile definition is given within a 2D coordinate system, which is inserted into the XY plane of the Position coordinate system inherited from the supertype IfcSweptAreaSolid. The attributes of the CartesianTransformationOperator3d (as given above) should apply to the Position coordinate system, in which the profile is inserted. Informal propositions: - The SweptArea shall lie in the plane z = 0. - The directrix shall lie on the ReferenceSurface.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcsurfacecurvesweptareasolid.htm"
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|
},
|
|
"IfcSurfaceOfLinearExtrusion": {
|
|
"attributes": {
|
|
"Depth": "The depth of the extrusion, it determines the parameterization.",
|
|
"ExtrudedDirection": "The direction of the extrusion.",
|
|
"ExtrusionAxis": "The extrusion axis defined as vector. IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector (ExtrudedDirection, Depth)"
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: This surface is a simple swept surface or a generalized cylinder obtained by sweeping a curve in a given direction. The parameterization is as follows where the curve has a parameterization l(u): Informal propositions: - The surface shall not self-intersect",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcsurfaceoflinearextrusion.htm"
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|
},
|
|
"IfcSurfaceOfRevolution": {
|
|
"attributes": {
|
|
"AxisLine": "The line coinciding with the axis of revolution. IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcCurve() || IfcLine(AxisPosition.Location, IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector(AxisPosition.Z,1.0))",
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"AxisPosition": "A point on the axis of revolution and the direction of the axis of revolution."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A surface of revolution (IfcSurfaceOfRevolution) is the surface obtained by rotating a curve one complete revolution about an axis. The data shall be interpreted as below. The parameterization is as follows where the curve has a parameterization l(u): For a surface of revolution the parametric range is 0 < u < 360 degree. The parameterization range for v is defined by referenced curve. Informal propositions: - The surface shall not self-intersect - The swept curve shall not be coincident with the axis line for any finite part of its legth.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcsurfaceofrevolution.htm"
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|
},
|
|
"IfcSurfaceStyle": {
|
|
"attributes": {
|
|
"Side": "An indication of which side of the surface to apply the style.",
|
|
"Styles": "A collection of different surface styles."
|
|
},
|
|
"description": "An assignment of one or many surface style elements to a surface, defined by subtypes of IfcSurface, IfcFaceBasedSurfaceModel, IfcShellBasedSurfaceModel, or by subtypes of IfcSolidModel. The positive direction of the surface normal relates to the positive side. In case of solids the outside of the solid is to be taken as positive side.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacestyle.htm"
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|
},
|
|
"IfcSurfaceStyleLighting": {
|
|
"attributes": {
|
|
"DiffuseReflectionColour": "The degree of diffusion of the reflected light. In the case of specular surfaces there is no diffusion. The greater the diffusing power of the reflecting surface, the smaller the specular component of the reflected light, up to the point where only diffuse light is produced. A value of 1 means totally diffuse for that colour part of the light. > The factor can be measured physically and has three ratios for the red, green and blue part of the light.",
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|
"DiffuseTransmissionColour": "The degree of diffusion of the transmitted light. In the case of completely transparent materials there is no diffusion. The greater the diffusing power, the smaller the direct component of the transmitted light, up to the point where only diffuse light is produced.A value of 1 means totally diffuse for that colour part of the light. > The factor can be measured physically and has three ratios for the red, green and blue part of the light.",
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|
"ReflectanceColour": "A coefficient that determines the extent that the light falling onto a surface is fully or partially reflected. > The factor can be measured physically and has three ratios for the red, green and blue part of the light.",
|
|
"TransmissionColour": "Describes how the light falling on a body is totally or partially transmitted. > The factor can be measured physically and has three ratios for the red, green and blue part of the light."
|
|
},
|
|
"description": "IfcSurfaceStyleLighting is a container class for properties for calculation of physically exact illuminance related to a particular surface style. The illustration above shows the reflection and transmission components from an incident ray. The sum of the components for reflection and transmission is a value of 1.0 denoting that the incident ray is completely decomposed into reflection and transmission components. Each value of reflection and transmission is therefore within the range 0.0 to 1.0. All these factors can be measured physically and are ratios for the red, green and blue part of the light. These properties are defined in the model as Type IfcColorRGB with a factor for each colour.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacestylelighting.htm"
|
|
},
|
|
"IfcSurfaceStyleRefraction": {
|
|
"attributes": {
|
|
"DispersionFactor": "The Abbe constant given as a fixed ratio between the refractive indices of the material at different wavelengths. A low Abbe number means a high dispersive power. In general this translates to a greater angular spread of the emergent spectrum.",
|
|
"RefractionIndex": "The index of refraction for all wave lengths of light. The refraction index is the ratio between the speed of light in a vacuum and the speed of light in the medium. E.g. glass has a refraction index of 1.5, whereas water has an index of 1.33"
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|
},
|
|
"description": "IfcSurfaceStyleRefraction extends the surface style lighting, or the surface style rendering definition for properties for calculation of physically exact illuminance by adding seldomly used properties. Currently this includes the refraction index (by which the light ray refracts when passing through a prism) and the dispersion factor (or Abbe constant) which takes into account the wavelength dependency of the refraction.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacestylerefraction.htm"
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|
},
|
|
"IfcSurfaceStyleRendering": {
|
|
"attributes": {
|
|
"DiffuseColour": "The diffuse part of the reflectance equation can be given as either a colour or a scalar factor. The diffuse colour field reflects all light sources depending on the angle of the surface with respect to the light source. The more directly the surface faces the light, the more diffuse light reflects. The diffuse factor field specifies how much diffuse light from light sources this surface shall reflect. Diffuse light depends on the angle of the surface with respect to the light source. The more directly the surface faces the light, the more diffuse light reflects. The diffuse colour is then defined by surface colour \\* diffuse factor.",
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|
"DiffuseTransmissionColour": "The diffuse transmission part of the reflectance equation can be given as either a colour or a scalar factor. It only applies to materials whose Transparency field is greater than zero. The diffuse transmission colour specifies how much diffuse light is reflected at the opposite side of the material surface. The diffuse transmission factor field specifies how much diffuse light from light sources this surface shall reflect on the opposite side of the material surface. The diffuse transmissive colour is then defined by surface colour \\* diffuse transmissive factor.",
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|
"ReflectanceMethod": "Identifies the predefined types of reflectance method from which the method required may be set.",
|
|
"ReflectionColour": "The reflection (or mirror) part of the reflectance equation can be given as either a colour or a scalar factor. Applies to \"glass\" and \"mirror\" reflection models. The reflection colour specifies the contribution made by light from the mirror direction, i.e. light being reflected from the surface. The reflection factor specifies the amount of contribution made by light from the mirror direction. The reflection colour is then defined by surface colour \\* reflection factor.",
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|
"SpecularColour": "The specular part of the reflectance equation can be given as either a colour or a scalar factor. The specular colour determine the specular highlights (e.g., the shiny spots on an apple). When the angle from the light to the surface is close to the angle from the surface to the viewer, the specular colour is added to the diffuse and ambient colour calculations. The specular factor defines the specular part, the specular colour is then defined by surface colour \\* specular factor.",
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|
"SpecularHighlight": "The exponent or roughness part of the specular reflectance.",
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|
"TransmissionColour": "The transmissive part of the reflectance equation can be given as either a colour or a scalar factor. It only applies to materials which Transparency field is greater than zero. The transmissive colour field specifies the colour that passes through a transparant material (like the colour that shines through a glass). The transmissive factor defines the transmissive part, the transmissive colour is then defined by surface colour \\* transmissive factor.",
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|
"Transparency": "Definition from ISO/CD 10303-46: The degree of transparency is indicated by the percentage of light traversing the surface. Definition from VRML97 - ISO/IEC 14772-1:1997: The transparency field specifies how \"clear\" an object is, with 1.0 being completely transparent, and 0.0 completely opaque. If not given, the value 0.0 (opaque) is assumed."
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|
},
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|
"description": "IfcSurfaceStyleRendering holds the properties for visualization related to a particular surface side style. It allows rendering properties to be defined by: - a transparency component (Transparency attribute) - a colour component (SurfaceColour attribute inherited from IfcSurfaceStyleShading) - a reflectance component, given either by applying reflectance factors to the surface colour: diffuse component (SurfaceColour * DiffuseFactor) transmission component (SurfaceColour * TransmissionFactor ) diffuse transmission component (SurfaceColour * DiffuseTransmissionFactor) reflection component (SurfaceColour * ReflectionFactor) specular component (SurfaceColour * SpecularFactor attribute together with SpecularHighlight) explicitly defining such factors as colours (DiffuseColour, TransmissionColour, DiffuseTransmissionColour, ReflectionColour and SpecularColour) - a displacement component, currently only given by a texture map with the TextureType = bump - a coverage component, currently only given by the alpha component of the texture map (2 or 4 component colour texture)",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacestylerendering.htm"
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|
},
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|
"IfcSurfaceStyleShading": {
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|
"attributes": {
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|
"SurfaceColour": "The colour used to render the surface. The surface colour for visualisation is defined by specifying the intensity of red, green and blue."
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|
},
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|
"description": "Definition from ISO/CD 10303-46:1992: The surface style rendering allows the realistic visualization of surfaces referring to rendering techniques based on the laws of physics and mathematics. The entity IfcSurfaceStyleShading allows for colour information used for shading, whereas subtypes provide data for more sophisticated rendering techniques. The surface colour is used for colouring or simple shading of the assigned surfaces.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacestyleshading.htm"
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|
},
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|
"IfcSurfaceStyleWithTextures": {
|
|
"attributes": {
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|
"Textures": "The textures applied to the surface. Only one image map with the same image map type shall be applied."
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|
},
|
|
"description": "Definition from IAI: The entity IfcSurfaceStyleWithTextures allows for the assignment of image textures to surface styles. These image textures can be applied repeating across the surface or mapped with a particular scale upon the surface. The entity IfcSurfaceStyleWithTextures is part of the surface style table for presentation information assigned to surfaces for shading, rendering and lighting with textures. The mapping of the texture onto the surface or the solid is determined by the texture coordinates, each IfcAnnotationSurfaceOccurrence has a TextureCoordinates attribute, referencing the texture coordinates for the occurrence of the IfcSurfaceStyleWithTextures.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacestylewithtextures.htm"
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|
},
|
|
"IfcSurfaceTexture": {
|
|
"attributes": {
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|
"RepeatS": "The RepeatS field specifies how the texture wraps in the S direction. If RepeatS is TRUE (the default), the texture map is repeated outside the [0.0, 1.0] texture coordinate range in the S direction so that it fills the shape. If repeatS is FALSE, the texture coordinates are clamped in the S direction to lie within the [0.0, 1.0] range.",
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|
"RepeatT": "The RepeatT field specifies how the texture wraps in the T direction. If RepeatT is TRUE (the default), the texture map is repeated outside the [0.0, 1.0] texture coordinate range in the T direction so that it fills the shape. If repeatT is FALSE, the texture coordinates are clamped in the T direction to lie within the [0.0, 1.0] range.",
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"TextureTransform": "These parameters support changes to the size, orientation, and position of textures on shapes. Note that these operations appear reversed when viewed on the surface of geometry. For example, a scale value of (2 2) will scale the texture coordinates and have the net effect of shrinking the texture size by a factor of 2 (texture coordinates are twice as large and thus cause the texture to repeat). A translation of (0.5 0.0) translates the texture coordinates +.5 units along the S-axis and has the net effect of translating the texture -0.5 along the S-axis on the geometry's surface. A rotation of PI/2 of the texture coordinates results in a -PI/2 rotation of the texture on the geometry.",
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|
"TextureType": "Identifies the predefined types of image map from which the type required may be set."
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|
},
|
|
"description": "Definition from IAI: An IfcSurfaceTexture provides a 2-dimensional image-based texture map. It can either be given by referencing an external image file through an URL reference (IfcImageTexture), or by explicitly including an array of pixels (IfcPixelTexture). The following additional definitions from ISO/IEC FCD 19775:200x, the Extensible 3D (X3D) specification, apply: - Texture: An image used in a texture map to create visual appearance effects when applied to geometry nodes. - Texture map: A texture plus the general parameters necessary for mapping the texture to geometry. Texture maps are defined by 2D images that contain an array of colour values describing the texture. The texture map values are interpreted differently depending on the number of components in the texture map and the specifics of the image format. In general, texture maps may be described using one of the following forms: - Intensity textures (one-component) - Intensity plus alpha opacity textures (two-component) - Full RGB textures (three-component) - Full RGB plus alpha opacity textures (four-component)",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacetexture.htm"
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|
},
|
|
"IfcSweptAreaSolid": {
|
|
"attributes": {
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|
"Position": "Position coordinate system for the swept area.",
|
|
"SweptArea": "The surface defining the area to be swept. It is given as a profile definition within the xy plane of the position coordinate system."
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|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: The swept area solid entity collects the entities which are defined procedurally by sweeping action on planar bounded surfaces. The position is space of the swept solid will be dependent upon the position of the swept area. The swept area will be a face of the resulting swept area solid, except for the case of a revolved area solid with angle equal to 2 p (or 360 degrees). The swept area is defined by a cross section (also referred to as profile), which is given as a closed two-dimensional boundary on an implicit plane. The swept area is defined in the xy plane of the position coordinate system, which is given for the swept area solid.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcsweptareasolid.htm"
|
|
},
|
|
"IfcSweptDiskSolid": {
|
|
"attributes": {
|
|
"Directrix": "The curve used to define the sweeping operation. The solid is generated by sweeping a circular disk along the directrix.",
|
|
"EndParam": "The parameter value on the directrix at which the sweeping operation ends.",
|
|
"InnerRadius": "This attribute is optional, if present it defines the radius of a circular hole in the centre of the disk.",
|
|
"Radius": "The radius of the circular disk to be swept along the directrix.",
|
|
"StartParam": "The parameter value on the directrix at which the sweeping operation commences."
|
|
},
|
|
"description": "Definition from ISO/FDIS 10303-42-ed3:2002: A swept disk solid is the solid produced by sweeping a circular disk along a three dimensional curve. During the sweeping operation the normal to the plane of the circular disk is in the direction of the tangent to the directrix curve and the center of the disk lies on the directrix. The circular disk may, optionally, have a central hole, in this case the resulting solid has a through hole, or, an internal void when the directrix forms a close curve.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcsweptdisksolid.htm"
|
|
},
|
|
"IfcSweptSurface": {
|
|
"attributes": {
|
|
"Dim": "The space dimensionality of this class, derived from the dimensionality of the Position. Position.Dim",
|
|
"Position": "Position coordinate system for the placement of the profile within the xy plane of the axis placement.",
|
|
"SweptCurve": "The curve to be swept in defining the surface. The curve is defined as a profile within the position coordinate system."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A swept surface is one that is constructed by sweeping a curve along another curve.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcsweptsurface.htm"
|
|
},
|
|
"IfcSwitchingDeviceType": {
|
|
"description": "An IfcSwitchingDeviceType defines a particular type of switch which is a mechanically operated contactor. *Use Definitions* An IfcSwitchingDeviceType is a subtype of IfcFlowControllerType that provides for all forms of switch. Usage of IfcSwitchingDeviceType defines the parameters for one or more occurrences of IfcFlowController. Parameters are specified through property sets that are enumerated in the IfcSwitchingDeviceTypeEnum data type. *Property Set Use Definition*: The property sets relating to the IfcSwitchingDeviceType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcSwitchingDeviceType are part of this IFC release: - Pset_ElectricalDeviceCommon: property set for properties that are common to all types of electrical devices, if available - Pset_SwitchingDeviceTypeCommon: property set for properties that are common to all types of switching device, if available - Pset_SwitchingDeviceTypeContactor: specific property set for the properties of a contactor , if available - Pset_SwitchingDeviceTypeEmergencyStop: specific property set for the properties of an emergency stop device, if available - Pset_SwitchingDeviceTypeStarter: specific property set for the properties of a starter, if available - Pset_SwitchingDeviceTypeSwitchDisconnector: specific property set for the properties of a switch disconnector, if available - Pset_SwitchingDeviceTypeToggleSwitch: specific property set for the properties of a toggle switch, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"CONTACTOR": "An electrical device used to control the flow of power in a circuit on or off.",
|
|
"EMERGENCYSTOP": "An emergency stop device acts to remove as quickly as possible any danger that may have arisen unexpectedly.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"STARTER": "A starter is a switch which in the closed position controls the application of power to an electrical device.",
|
|
"SWITCHDISCONNECTOR": "A switch disconnector is a switch which in the open position satisfies the isolating requirements specified for a disconnector.",
|
|
"TOGGLESWITCH": "A toggle switch has two positions, and may enable or isolate electrical power or other setting (according to the switched port type).",
|
|
"USERDEFINED": "User-defined type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcswitchingdevicetype.htm"
|
|
},
|
|
"IfcSymbolStyle": {
|
|
"attributes": {
|
|
"StyleOfSymbol": "The style applied to the symbol for its visual appearance."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: The symbol style is the presentation style that indicates the presentation of annotation symbols.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsymbolstyle.htm"
|
|
},
|
|
"IfcSystem": {
|
|
"attributes": {
|
|
"ServicesBuildings": "Reference to the ~~building~~ spatial structure via the objectified relationship _IfcRelServicesBuildings_, which is serviced by the system."
|
|
},
|
|
"description": "Organized combination of related parts within an AEC product, composed for a common purpose or function or to provide a service. System is essentially a functionally related aggregation of products. The grouping relationship to one or several instances of IfcProduct (the system members) is handled by IfcRelAssignsToGroup.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcsystem.htm"
|
|
},
|
|
"IfcSystemFurnitureElementType": {
|
|
"description": "An IfcSystemFurnitureElementType defines a particular type of component or element of systems or modular furniture. *Use Definitions* An IfcSystemFurnitureElementType provides for all types of elements of system furniture. Occurrences of a type of system furniture element are specified through IfcFurnishingElement. An occurrence of a complete IfcFurnishingElement made up of system furniture elements is created using IfcRelNests (if only the system furniture elements are specified) or IfcRelAggregates (in cases where both the system furniture elements, means of joining together the elements and other accessories such as cable tray and wiring etc. are included). *Property Set Use Definition*: The property sets relating to an IfcSystemFurnitureElementType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcSystemFurnitureElementType are part of this IFC release: - Pset_SystemFurnitureElementTypeCommon: property set for the properties common to all types of system furniture element, if available - Pset_SystemFurnitureElementTypePanel: specific property set for the properties of a system furniture panel, if available - Pset_SystemFurnitureElementTypeWorkSurface: specific property set for the properties of a system furniture work surface, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem. *Name Use Definitions*The name of the type of system furniture element is defined through the IfcSystemFurnitureElementType.Name attribute (through inheritance from IfcRoot). For further indormation on usage, refer to IfcFurnitureType",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedfacilitieselements/lexical/ifcsystemfurnitureelementtype.htm"
|
|
},
|
|
"IfcTShapeProfileDef": {
|
|
"attributes": {
|
|
"CentreOfGravityInY": "Location of centre of gravity along the x axis measured from the center of the bounding box.",
|
|
"Depth": "Web lengths, see illustration above (= h).",
|
|
"FilletRadius": "Fillet radius according the above illustration (= r1). If it is not given, zero is assumed.",
|
|
"FlangeEdgeRadius": "Edge radius according the above illustration (= r2). If it is not given, zero is assumed.",
|
|
"FlangeSlope": "Slope of web of the profile. If it is not given, zero is assumed.",
|
|
"FlangeThickness": "Constant wall thickness of flange (= tg).",
|
|
"FlangeWidth": "Flange lengths, see illustration above (= b).",
|
|
"WebEdgeRadius": "Edge radius according the above illustration (= r3). If it is not given, zero is assumed.",
|
|
"WebSlope": "Slope of flange of the profile. If it is not given, zero is assumed.",
|
|
"WebThickness": "Constant wall thickness of web (= ts)."
|
|
},
|
|
"description": "Definition from IAI: The IfcTShapeProfileDef defines a section profile that provides the defining parameters of a T-shaped section to be used by the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration. The centre of the position coordinate system is in the profiles centre of the ~~gravity~~ bounding box. The centre of gravity, if given, is located in x direction within the center of the bounding box, and in y-direction along the positive y axis, the offset value is given by the offset parameter CentreOfGravityInY. Illustration: Table: Parameters of T-shape profile definition",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifctshapeprofiledef.htm"
|
|
},
|
|
"IfcTable": {
|
|
"attributes": {
|
|
"Name": "A unique name which is intended to describe the usage of the Table.",
|
|
"NumberOfCellsInRow": "The number of cells in each row, this complies to the number of columns in a table. See WR2 that ensures that each row has the same number of cells. The actual value is derived from the first member of the Rows list. HIINDEX(Rows[1].RowCells)",
|
|
"NumberOfDataRows": "The number of rows in a table that contains data, i.e. total number of rows minus number of heading rows in table. SIZEOF(QUERY( Temp <* Rows | NOT(Temp.IsHeading)))",
|
|
"NumberOfHeadings": "The number of headings in a table. This is restricted by WR3 to max. one. SIZEOF(QUERY( Temp <* Rows | Temp.IsHeading))",
|
|
"Rows": "Reference to information content of rows."
|
|
},
|
|
"description": "A data structure for the provision of information in the form of rows and columns. Each instance may have a heading row with titles or descriptions for each column. The rows of information are stored as a list of IfcTableRow objects. Limitation: In this release of IFC the rows of an IfcTable object are constrained to have the same number of cells. The first Row of the table provides the number of cells. All other rows are forced to include the same number of cells. This is enforced by the WR2.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcutilityresource/lexical/ifctable.htm"
|
|
},
|
|
"IfcTableRow": {
|
|
"attributes": {
|
|
"IsHeading": "Flag which identifies if the row is a heading row or a row which contains row values. NOTE - If the row is a heading, the flag takes the value = TRUE.",
|
|
"OfTable": "Reference to the IfcTable, in which the IfcTableRow is defined (or contained).",
|
|
"RowCells": "The value of information by row and column using the units defined. NOTE - The row value identifies both the actual value and the units in which it is recorded. Each cell (unique row and column) may have a different value AND different units. If the row is a heading row, then the row values are strings defined by the IfcString."
|
|
},
|
|
"description": "The information content of each row within the table (other than the heading row). A table contains a number of rows which record information concerning the instance of the type of information recorded within the table. Limitation: Within this release of IFC all IfcTableRow objects referenced by an IfcTable shall have the same number of Row Cells. The actual number of Cells shall be taken from the number of cells of the first IfcTableRow for that table. The number of Cells is calculated by the derived attribute NumberOfCellsInRow in the associated IfcTable.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcutilityresource/lexical/ifctablerow.htm"
|
|
},
|
|
"IfcTankType": {
|
|
"description": "The element type IfcTankType defines a list of commonly shared property set definitions of a tank and an optional set of product representations. It is used to define a tank specification (i.e. the specific product information, that is common to all occurrences of that product type). A tank type is used to define the common properties of a Tank that may be applied to many occurrences of that type. A tank is a device used to hold gasses and liquids. Tank types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcTankType are represented by instances of IfcFlowStorageDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_TankTypeCommon: common property set for all tank types Pset_TankTypeExpansion: property set for expansion tank types Pset_TankTypePreformed: property set for preformed tank types Pset_TankTypePressureVessel: property set for pressure vessel tank types Pset_TankTypeSectional: property set for sectional tank types",
|
|
"predefined_types": {
|
|
"EXPANSION": "A closed container used in a closed fluid distribution system to mitigate the effects of thermal expansion or water hammer. The tank is typically constructed with a diaphragm dividing the tank into two sections, with fluid on one side of the diaphragm and air on the other. One example application is when connected to the primary circuit of a hot water system to accommodate the increase in volume of the water when it is heated.",
|
|
"NOTDEFINED": "Undefined tank type.",
|
|
"PREFORMED": "",
|
|
"PRESSUREVESSEL": "A closed container used for storing fluids or gases at a pressure different from the ambient pressure. A pressure vessel is typically rated by an authority having jurisdiction for the operational pressure.",
|
|
"SECTIONAL": "",
|
|
"USERDEFINED": "User-defined tank type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifctanktype.htm"
|
|
},
|
|
"IfcTask": {
|
|
"attributes": {
|
|
"IsMilestone": "Identifies whether a task is a milestone task (=TRUE) or not (= FALSE). NOTE: In small project planning applications, a milestone task may be understood to be a task having no duration. As such, it represents a singular point in time.",
|
|
"Priority": "A value that indicates the relative priority of the task (in comparison to the priorities of other tasks).",
|
|
"Status": "Current status of the task. NOTE: Particular values for status are not specified, these should be determined and agreed by local usage. Examples of possible status values include 'Not Yet Started', 'Started', 'Completed'.",
|
|
"TaskId": "An identifying designation given to a task.",
|
|
"WorkMethod": "The method of work used in carrying out a task."
|
|
},
|
|
"description": "An IfcTask is an identifiable unit of work to be carried out independently of any other units of work in a construction project. Use Definitions Work is identified as tasks (i.e. IfcTask) that are capable of either containing other tasks or being sub-items of other tasks. A task can be used to describe a process for the construction or installation of products. Each instance of IfcTask is given a name that is indicative of its content. A textual description of the the task may be be provided. Instances of IfcTask may be assigned to an IfcWorkControl (either a work plan or a work schedule) through the IfcRelAssignsTasks relationship class. The installation of a number of items of equipment within a particular space may be the subject of a single task which is identified as e.g. \u2018fix equipment in space 123\u2019. IfcTask represents the occurrence of a work performance of a type of process in a construction plan. A task can nest other tasks as sub-items; the nesting relationship is modeled by IfcRelNests. For example, the construction of a stud wall may be designated as a nesting task named \u2018install wall #1\u2019 including other tasks such as \u2018install dry wall\u2019, \u2018install studs\u2019, \u2018wall taping\u2019, and \u2018erect wall\u2019 as sub-processes. Special information relating to a task is asserted using IfcTask.ObjectType (inherited from IfcObject). Examples that may be used include fixed duration, fixed unit, fixed work. The sequential relationships between tasks are represented by IfcRelSequence in IfcKernel schema. Resource used by tasks are assigned by IfcRelAssignsToProcess. Quantities of resources consumed by the task are dealt with by defining the IfcElementQuantity for the resource and not at the instance of IfcTask. An IfcTask may be assigned a Work Breakdown Structure (WBS) code. A WBS code is dealt with as a classification of task and is associated to a task occurrence using the IfcRelAssociatesClassification relationship class. As well as being to designate the code, the classification structure of the IFC model also enables the source of the work breakdown structure classification to be identified.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprocessextension/lexical/ifctask.htm"
|
|
},
|
|
"IfcTelecomAddress": {
|
|
"attributes": {
|
|
"ElectronicMailAddresses": "The list of Email addresses at which Email messages may be received.",
|
|
"FacsimileNumbers": "The list of fax numbers at which fax messages may be received.",
|
|
"PagerNumber": "The pager number at which paging messages may be received.",
|
|
"TelephoneNumbers": "The list of telephone numbers at which telephone messages may be received.",
|
|
"WWWHomePageURL": "The world wide web address at which the preliminary page of information for the person or organization can be located. > NOTE: Information on the world wide web for a person or organization may be separated into a number of pages and across a number of host sites, all of which may be linked together. It is assumed that all such information may be referenced from a single page that is termed the home page for that person or organization."
|
|
},
|
|
"description": "Address to which telephone, electronic mail and other forms of telecommunications should be addressed.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifctelecomaddress.htm"
|
|
},
|
|
"IfcTendon": {
|
|
"attributes": {
|
|
"AnchorageSlip": "The deformation of an anchor or slippage of tendons when the prestressing device is released.",
|
|
"CrossSectionArea": "The effective cross-section area of the tendon.",
|
|
"FrictionCoefficient": "The friction coefficient for the bond between the tendon and the surrounding concrete.",
|
|
"MinCurvatureRadius": "The smallest curvature radius calculated on the whole effective length of the tendon where the tension properties are still valid.",
|
|
"NominalDiameter": "The nominal diameter defining the cross-section size of the tendon.",
|
|
"PreStress": "The prestress to be applied on the tendon.",
|
|
"TensionForce": "The maximum allowed tension force that can be applied on the tendon."
|
|
},
|
|
"description": "A steel element such as a wire, cable, bar, rod, or strand used to impart prestress to concrete when the element is tensioned. Geometry Use Definitions: The geometric representation of IfcTendon is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcBuildingElementComponent. Standard Geometric Representation using Swept Solid Representation The standard geometric representation of IfcTendon is defined using the swept solid representation. The RepresentationType attribute of IfcShapeRepresentation should have the value 'SweptSolid'. The solid is formed from a cross section approximated as a circular disk swept along any arbitrary curve. Given this, the following constraints apply to the standard representation: - Solid: IfcSweptDiskSolid introduced in IFC Release 2x2 shall be supported. - Profile: The circular disk cross section approximation is defined by the Radius attribute of IfcSweptDiskSolid. - Extrusion: The extrusion along any arbitrary curve is defined by the Directrix attribute of IfcSweptDiskSolid. Simplified Geometric Representation Simplified geometric representations may be used based on local agreements.",
|
|
"predefined_types": {
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|
"BAR": "The tendon is configured as a bar.",
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|
"COATED": "The tendon is coated.",
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|
"NOTDEFINED": "The type of tendon is not defined.",
|
|
"STRAND": "The tendon is a strand.",
|
|
"USERDEFINED": "The type of tendon is user defined.",
|
|
"WIRE": "The tendon is a wire."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifctendon.htm"
|
|
},
|
|
"IfcTendonAnchor": {
|
|
"description": "In prestressed or posttensioned concrete, the end connection for the tendons. Geometry Use Definitions: The geometric representation of IfcTendonAnchor is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are: Local Placement The use of local placement is defined at the supertype IfcBuildingElementComponent. Standard Geometric Representation The use of Standard Geometric Representations is defined at the supertype IfcBuildingElementComponent.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifctendonanchor.htm"
|
|
},
|
|
"IfcTerminatorSymbol": {
|
|
"attributes": {
|
|
"AnnotatedCurve": "The curve being annotated by the terminator symbol."
|
|
},
|
|
"description": "A terminator symbol is a special type of an annotated symbol which is assigned to a curve to indicate a direction, origin, target, or any other associated meaning.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcterminatorsymbol.htm"
|
|
},
|
|
"IfcTextLiteral": {
|
|
"attributes": {
|
|
"Literal": "The text literal to be presented.",
|
|
"Path": "The writing direction of the text literal.",
|
|
"Placement": "An _IfcAxis2Placement_ that determines the placement and orientation of the presented string. > When used with a text style based on IfcTextStyleWithBoxCharacteristics then the y-axis is taken as the reference direction for the box rotation angle and the box slant angle."
|
|
},
|
|
"description": "Definition from IAI: The text literal is a geometric representation item which describes a text string using a string literal and additional position, and path information.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifctextliteral.htm"
|
|
},
|
|
"IfcTextLiteralWithExtent": {
|
|
"attributes": {
|
|
"BoxAlignment": "The alignment of the text literal relative to its position.",
|
|
"Extent": "The extent in the x and y direction of the text literal."
|
|
},
|
|
"description": "Definition from IAI: The text literal with extent is a text literal with the additional explicit information of the planar extent (or surrounding text box). An alignment attribute defines, how the text box is aligned to the placement and how it may expand.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifctextliteralwithextent.htm"
|
|
},
|
|
"IfcTextStyle": {
|
|
"attributes": {
|
|
"TextCharacterAppearance": "A character style to be used for presented text.",
|
|
"TextFontStyle": "The style applied to the text font for its visual appearance. It defines the font family, font style, weight and size.",
|
|
"TextStyle": "The style applied to the text block for its visual appearance. It defines the text block characteristics, either for vector based or monospace text fonts (see select item _IfcTextStyleWithBoxCharacteristics_), or for true type text fonts (see select item _IfcTextStyleTextModel_."
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|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: The text style is a presentation style for annotation text.. Definition from IAI: The IfcTextStyle provides the text style table for presentation information assigned to text literals. The style is defined by color, text font characteristics, and text box characteristics. The definitions are based upon: - definitions from ISO/IS 10303-46:1994 for (old) vector based and monospace text. - definitions from Cascading Style Sheets, level 1, W3C Recommendation 17 Dec 1996, revised 11 Jan 1999, CSS1, for all true type text. The use of the CSS1 definitions is the preferred way to represent text styles. An IfcTextStyle, when representing (old) vector based and monospace text, is instantiated with: * TextCharacterAppearance:: IfcTextStyleForDefinedFont (with BackgroundColour = NIL) * TextStyle:: IfcTextStyleWithBoxCharacteristics * TextFontStyle:: IfcDraughtingPreDefinedTextFont or IfcExternallyDefinedTextFont An IfcTextStyle, when representing (new) true type text, based on CSS1 definitions, is instantiated with: * TextCharacterAppearance:: IfcTextStyleForDefinedFont * TextStyle:: IfcTextStyleTextModel * TextFontStyle:: IfcTextStyleFontModel An IfcTextStyle can be assigned to IfcTextLiteral via the IfcPresentationStyleAssignment through an intermediate IfcAnnotationTextOccurrence.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifctextstyle.htm"
|
|
},
|
|
"IfcTextStyleFontModel": {
|
|
"attributes": {
|
|
"FontFamily": "The value is a prioritized list of font family names and/or generic family names. The first list entry has the highest priority, if this font fails, the next list item shall be used. The last list item should (if possible) be a generic family.",
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|
"FontSize": "The font size provides the size or height of the text font. > NOTE The following values are allowed, <IfcLengthMeasure, with positive values, the length unit is globally defined at IfcUnitAssignment.",
|
|
"FontStyle": "The font style property selects between normal (sometimes referred to as \"roman\" or \"upright\"), italic and oblique faces within a font family.",
|
|
"FontVariant": "The font variant property selects between normal and small-caps. > NOTE It has been introduced for later compliance to full CSS1 support.",
|
|
"FontWeight": "The font weight property selects the weight of the font. > NOTE Values other then 'normal' and 'bold' have been introduced for later compliance to full CSS1 support."
|
|
},
|
|
"description": "Definition from CSS1 (W3C Recommendation): Setting font properties will be among the most common uses of style sheets. Unfortunately, there exists no well-defined and universally accepted taxonomy for classifying fonts, and terms that apply to one font family may not be appropriate for others. E.g. 'italic' is commonly used to label slanted text, but slanted text may also be labeled as being Oblique, Slanted, Incline, Cursive or Kursiv. Therefore it is not a simple problem to map typical font selection properties to a specific font. Font matching Because there is no accepted, universal taxonomy of font properties, matching of properties to font faces must be done carefully. The properties are matched in a well-defined order to insure that the results of this matching process are as consistent as possible across user agents (assuming that the same library of font faces is presented to each of them). - The user agent makes (or accesses) a database of relevant CSS1 properties of all the fonts of which the UA is aware. The UA may be aware of a font because it has been installed locally or it has been previously downloaded over the web. If there are two fonts with exactly the same properties, one of them is ignored. - At a given element and for each character in that element, the UA assembles the font-properties applicable to that element. Using the complete set of properties, the UA uses the 'font-family' property to choose a tentative font family. The remaining properties are tested against the family according to the matching criteria described with each property. If there are matches for all the remaining properties, then that is the matching font face for the given element. - If there is no matching font face within the 'font-family' being processed by step 2, and if there is a next alternative 'font-family' in the font set, then repeat step 2 with the next alternative 'font-family'. - If there is a matching font face, but it doesn't contain a glyph for the current character, and if there is a next alternative 'font-family' in the font sets, then repeat step 2 with the next alternative 'font-family'. - If there is no font within the family selected in 2, then use a UA-dependent default 'font-family' and repeat step 2, using the best match that can be obtained within the default font. (The above algorithm can be optimized to avoid having to revisit the CSS1 properties for each character.) The per-property matching rules from (2) above are as follows: - 'font-style' is tried first. 'italic' will be satisfied if there is either a face in the UA's font database labeled with the CSS keyword 'italic' (preferred) or 'oblique'. Otherwise the values must be matched exactly or font-style will fail. - 'font-variant' is tried next. 'normal' matches a font not labeled as 'small-caps'; 'small-caps' matches (1) a font labeled as 'small-caps', (2) a font in which the small caps are synthesized, or (3) a font where all lowercase letters are replaced by upper case letters. A small-caps font may be synthesized by electronically scaling uppercase letters from a normal font. - 'font-weight' is matched next, it will never fail. (See 'font-weight' below.) - 'font-size' must be matched within a UA-dependent margin of tolerance. (Typically, sizes for scalable fonts are rounded to the nearest whole pixel, while the tolerance for bitmapped fonts could be as large as 20%.) Further computations, are based on the 'font-size' value that is used, not the one that is specified. Definition from IAI: The inherited Name attribute is used to define the font name, particularly in cases, where no (list of) font families are provided.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifctextstylefontmodel.htm"
|
|
},
|
|
"IfcTextStyleForDefinedFont": {
|
|
"attributes": {
|
|
"BackgroundColour": "This property sets the background color of an element.",
|
|
"Colour": "This property describes the text color of an element (often referred to as the foreground color)."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-46:1992: A text style for defined font is a character glyph style for pre-defined or externally defined text fonts. Definition from CSS1 (W3C Recommendation): These properties describe the color (often called foreground color) and background of an element (i.e. the surface onto which the content is rendered). One can set a background color. Definition from IAI: The IfcTextStyleForDefinedFont combines the text font color with an optional background color, that fills the text box, defined by the planar extent given to the text literal.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifctextstylefordefinedfont.htm"
|
|
},
|
|
"IfcTextStyleTextModel": {
|
|
"attributes": {
|
|
"LetterSpacing": "The length unit indicates an addition to the default space between characters. Values can be negative, but there may be implementation-specific limits. The user agent is free to select the exact spacing algorithm. The letter spacing may also be influenced by justification (which is a value of the 'align' property). > NOTE The following values are allowed, IfcDescriptiveMeasure with value='normal', or IfcLengthMeasure, the length unit is globally defined at IfcUnitAssignment.",
|
|
"LineHeight": "The property sets the distance between two adjacent lines' baselines. When a ratio value is specified, the line height is given by the font size of the current element multiplied with the numerical value. A value of 'normal' sets the line height to a reasonable value for the element's font. It is suggested that user agents set the 'normal' value to be a ratio number in the range of 1.0 to 1.2. > NOTE The following values are allowed: IfcDescriptiveMeasure with value='normal', or IfcLengthMeasure, with non-negative values, the length unit is globally defined at IfcUnitAssignment, or IfcRatioMeasure.",
|
|
"TextAlign": "This property describes how text is aligned horizontally within the element. The actual justification algorithm used is dependent on the rendering algorithm.",
|
|
"TextDecoration": "This property describes decorations that are added to the text of an element.",
|
|
"TextIndent": "The property specifies the indentation that appears before the first formatted line. > NOTE It has been introduced for later compliance to full CSS1 support.",
|
|
"TextTransform": "This property describes how text characters may transform to upper case, lower case, or capitalized case, independent of the character case used in the text literal. > NOTE It has been introduced for later compliance to full CSS1 support.",
|
|
"WordSpacing": "The length unit indicates an addition to the default space between words. Values can be negative, but there may be implementation-specific limits. The user agent is free to select the exact spacing algorithm. The word spacing may also be influenced by justification (which is a value of the 'text-align' property). > NOTE It has been introduced for later compliance to full CSS1 support."
|
|
},
|
|
"description": "Definition from CSS1 (W3C Recommendation): The properties defined in the text model affect the visual presentation of characters, spaces, words, and paragraphs. Definition from IAI: The IfcTextStyleTextModel combines all text style properties, that affect the presentation of a text literal within a given extent. It includes the spacing between characters and words, the horizontal and vertical alignment of the text within the planar box of the extent, decorations (like underline), transformations of the literal (like uppercase), and the height of each text line within a multi-line text block.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifctextstyletextmodel.htm"
|
|
},
|
|
"IfcTextStyleWithBoxCharacteristics": {
|
|
"attributes": {
|
|
"BoxHeight": "It is the height scaling factor in the definition of a character glyph.",
|
|
"BoxRotateAngle": "It indicated that the box of a character glyph shall be presented at an angle to the base line of a text string within which the glyph occurs, the angle being that between the base line of the glyph and an axis perpendicular to the baseline of the text string.",
|
|
"BoxSlantAngle": "It indicated that the box of a character glyph shall be represented as a parallelogram, with the angle being between the character up line and an axis perpendicular to the character base line.",
|
|
"BoxWidth": "It is the width scaling factor in the definition of a character glyph.",
|
|
"CharacterSpacing": "The distance between the character boxes of adjacent characters."
|
|
},
|
|
"description": "Definition from IAI: The text style with box characteristics allows the presentation of annotated text by specifying the characteristics of the character boxes of the text and the spacing between the character boxes. The IfcTextStyleWithBoxCharacteristics is mainly used to provide some compatibility with ISO10303. Its usage is restricted to monospace text fonts (having uniform character boxes) and simple vector based text fonts. For true text fonts however the use of IfcTextStyleTextModel is required.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifctextstylewithboxcharacteristics.htm"
|
|
},
|
|
"IfcTextureCoordinate": {
|
|
"attributes": {
|
|
"AnnotatedSurface": ""
|
|
},
|
|
"description": "Definition from IAI: The IfcTextureCoordinate a an abstract supertype of the different kinds to apply texture coordinates to geometries. For vertex based geometries an explicit assignment of 2D texture vertices to the 3D geometry vertices is supported, in addition there can be a procedural description of texture coordinates. For parametrically described base geometry types a default mapping procedure is given.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifctexturecoordinate.htm"
|
|
},
|
|
"IfcTextureCoordinateGenerator": {
|
|
"attributes": {
|
|
"Mode": "The mode describes the algorithm used to compute texture coordinates.",
|
|
"Parameter": "The parameter used by the function as specified by Mode."
|
|
},
|
|
"description": "Definition from IAI: The IfcTextureCoordinateGenerator describes a procedurally defined mapping function with input parameter to map 2D texture coordinates to 3D geometry vertices. The allowable Mode values and input Parameter need to be agreed upon in implementer agreements. The following additional definitions from ISO/IEC FCD 19775:200x, the Extensible 3D (X3D) specification, apply:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifctexturecoordinategenerator.htm"
|
|
},
|
|
"IfcTextureMap": {
|
|
"attributes": {
|
|
"TextureMaps": "Reference to a list of texture vertex assignment to coordinates within a vertex based geometry."
|
|
},
|
|
"description": "Definition from IAI: An IfcTextureMap provides the mapping of the 2-dimensional texture coordinates to the surface onto which it is mapped. It is used for mapping the texture to vertex based geometry models, such as - IfcFacetedBrep - IfcFacetedBrepWithVoids - IfcFaceBasedSurfaceModel - IfcShellBasedSurfaceModel The IfcTextureMap provides a set of TextureMaps, each IfcVertexBasedTextureMap holds a corresponding pair of lists: - a list of TexturePoints, currently of type IfcCartesianPoint, and - a list of TexturesVertices of type IfcTextureVertex. Each IfcTextureVertex (given as S, T coordinates of 2 dimension) corresponds to the geometric coordinates of the IfcCartesianPoint (given as X, Y, and Z coordinates of 3 dimensions). Informal propositions: - All TexturePoints in the list TextureMaps of IfcVertexBasedTextureMap shall be used by the vertex based geometry, to which this texture map is assigned to by using the IfcAnnotationSurface.Item attribute.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifctexturemap.htm"
|
|
},
|
|
"IfcTextureVertex": {
|
|
"attributes": {
|
|
"Coordinates": "The first coordinate[1] is the S, the second coordinate[2] is the T parameter value."
|
|
},
|
|
"description": "Definition from IAI: An IfcTextureVertex is a list of 2 (S, T) texture coordinates. The following additional definitions from ISO/IEC FCD 19775:200x, the Extensible 3D (X3D) specification, apply:",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifctexturevertex.htm"
|
|
},
|
|
"IfcThermalMaterialProperties": {
|
|
"attributes": {
|
|
"BoilingPoint": "The boiling point of the material (fluid). Usually measured in Kelvin.",
|
|
"FreezingPoint": "The freezing point of the material (fluid). Usually measured in Kelvin.",
|
|
"SpecificHeatCapacity": "Defines the specific heat of the material: heat energy absorbed per temperature unit. Usually measured in [J/kg K].",
|
|
"ThermalConductivity": "The rate at which thermal energy is transmitted through the material.Usually in [W/m K]."
|
|
},
|
|
"description": "A container class with material thermal properties defined in IFC specification.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcthermalmaterialproperties.htm"
|
|
},
|
|
"IfcTimeSeries": {
|
|
"attributes": {
|
|
"DataOrigin": "The orgin of a time series data.",
|
|
"Description": "A text description of the data that the series represents.",
|
|
"DocumentedBy": "",
|
|
"EndTime": "The end time of a time series.",
|
|
"Name": "An unique name for the time series.",
|
|
"StartTime": "The start time of a time series.",
|
|
"TimeSeriesDataType": "The time series data type.",
|
|
"Unit": "The unit to be assigned to all values within the time series. Note that mixing units is not allowed. If the value is not given, the global unit for the type of _IfcValue_, as defined at _IfcProject.UnitsInContext_ is used.",
|
|
"UserDefinedDataOrigin": "Value of the data origin if DataOrigin attribute is USERDEFINED."
|
|
},
|
|
"description": "A time series is a set of a time-stamped data entries. It allows a natural association of data collected over intervals of time. Time series can be regular or irregular. In regular time series data arrive predictably at predefined intervals. In irregular time series some or all time stamps do not follow a repetitive pattern and unpredictable bursts of data may arrive at unspecified points in time. The modeling of buildings and their performance involves data that are generated and recorded over a period of time. Such data cover a large spectrum, from weather data to schedules of all kinds to status measurements to reporting to everything else that has a time related aspect. Their correct placement in time is essential for their proper understanding and use, and the IfcTimeSeries subtypes provide the appropriate data structures to accommodate these types of data.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctimeseriesresource/lexical/ifctimeseries.htm"
|
|
},
|
|
"IfcTimeSeriesReferenceRelationship": {
|
|
"attributes": {
|
|
"ReferencedTimeSeries": "",
|
|
"TimeSeriesReferences": ""
|
|
},
|
|
"description": "Relationship assigning documentation references to time series.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctimeseriesresource/lexical/ifctimeseriesreferencerelationship.htm"
|
|
},
|
|
"IfcTimeSeriesSchedule": {
|
|
"attributes": {
|
|
"ApplicableDates": "Defines an ordered list of the dates for which the time-series data are applicable. For example, the definition of all public holiday dates for a given year allows the formulation of a \"holiday\" occupancy schedule from overall occupancy data. Local time can be used if the dates are not bound to a particular year.",
|
|
"TimeSeries": "The time series is used to represent the values at discrete points in time that define the schedule. For example, a 24-hour occupancy schedule would be a regular time series with a start time at midnight, end time at (the following) midnight, and with 24 values indicating the occupancy load for each hour of the 24-hour period.",
|
|
"TimeSeriesScheduleType": "Defines the type of schedule, such as daily, weekly, monthly or annually."
|
|
},
|
|
"description": "The IfcTimeSeriesSchedule defines a time-series that is applicable to to one or more calendar dates. It typically contains a periodically repetitive time series used to define the schedule, facilitating the capture of hours of operation, occupancy loads, etc. Informal proposition: - If Intent : IfcConstraintIntentEnum is set to value UserDefined, then the intent shall be given by using inherited attribute IfcObject.ObjectType.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccontrolextension/lexical/ifctimeseriesschedule.htm"
|
|
},
|
|
"IfcTimeSeriesValue": {
|
|
"attributes": {
|
|
"ListValues": "A list of time-series values. At least one value is required."
|
|
},
|
|
"description": "A time series value is a list of values that comprise the time series. At least one value must be supplied. Applications are expected to normalize values by applying the following three rules: - All time (universal, local, daylight savings, and solar) is normalized against the ISO 8601 standard GMT/UTC (Universal Coordinated Time). - Any rollover is handled by the application providing the data. Rollover occurs, for example, when the measurement device resets itself while measuring and the recording data do not include the data measured before the reset. - The normalized data refer to the preceding time unit. The time series example shown in the figure below contains four time points: Time \"a\" indicates the beginning of the time series and the associated datum has no relevance. Data at time points \"b,\" \"c\" and \"d\" are associated with values 1, 2 and 3, respectively.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctimeseriesresource/lexical/ifctimeseriesvalue.htm"
|
|
},
|
|
"IfcTopologicalRepresentationItem": {
|
|
"description": "Definition from ISO/CD 10303-42:1992: The topological representation item is the supertype for all the topological representation items in the geometry resource.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifctopologicalrepresentationitem.htm"
|
|
},
|
|
"IfcTopologyRepresentation": {
|
|
"description": "Definition from IAI: The IfcTopologyRepresentation represents the concept of a particular topological representation of a product or a product component within a representation context. This representation context does not need to be (but may be) a geometric representation context. Several representation types for shape representation are included as predefined types: The representation type is given as a string value at the inherited attribute 'RepresentationType'.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifctopologyrepresentation.htm"
|
|
},
|
|
"IfcTransformerType": {
|
|
"description": "An IfcTransformerType defines a particular type of transformer that is an inductive stationary device that transfers electrical energy from one circuit to another. *Use Definitions* An IfcTransformerType is a subtype of IfcEnergyConversionDeviceType that provides for all forms of transformer. Usage of IfcTransformerType defines the parameters for one or more occurrences of IfcEnergyConversionDevice. Parameters are specified through a common property set. *Property Set Use Definition*: The property sets relating to the IfcTransformerType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcTransformerType are part of this IFC release: - Pset_ElectricalDeviceCommon: property set for properties that are common to all types of electrical devices, if available - Pset_TransformerTypeCommon: property set for properties that are common to all types of transformer, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
|
|
"predefined_types": {
|
|
"CURRENT": "A transformer that changes the current between circuits.",
|
|
"FREQUENCY": "A transformer that changes the frequency between circuits.",
|
|
"NOTDEFINED": "Undefined type.",
|
|
"USERDEFINED": "User-defined type.",
|
|
"VOLTAGE": "A transformer that changes the voltage between circuits."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifctransformertype.htm"
|
|
},
|
|
"IfcTransportElement": {
|
|
"attributes": {
|
|
"CapacityByNumber": "Capacity of the transportation element measured in numbers of person.",
|
|
"CapacityByWeight": "Capacity of the transport element measured by weight.",
|
|
"OperationType": "Predefined type for transport element."
|
|
},
|
|
"description": "Generalization of all transport related objects that move people, animals or goods within a building or building complex. The IfcTransportElement defines the occurrence of a covering type, that (if given) is expressed by the IfcTransportElementType. *Property Set Use Definition*: The property sets relating to the IfcTransportElement are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcTransportElement are part of this IFC release: - Pset_TransportElementCommon: common property set for all transport element occurrences - Pset_TransportElementElevator: specific property set for all occurrences of transport elements with the PredefinedType: ELEVATOR *Geometry Use Definitions*: The geometric representation of IfcTransportElement is given by the IfcProductDefinitionShape, allowing multiple geometric representation. Local Placement The local placement for IfcTransportElement is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement , which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. SurfaceModel Representation Any IfcTransportElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple surface models, based on either shell or face based models. Then the following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'SurfaceModel' Brep Representation Any IfcTransportElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple Boundary Representation elements (which are restricted to faceted Brep with or without voids). Then the following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'Brep' MappedRepresentation The new mapped item, IfcMappedItem, should be used if appropriate as it allows for reusing the geometry definition of the property element type at occurrences of the same equipment type. Then the following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: - RepresentationIdentifier : 'Body' - RepresentationType : 'MappedRepresentation'",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifctransportelement.htm"
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},
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"IfcTransportElementType": {
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|
"description": "The element type (IfcTransportElementType) defines a list of commonly shared property set definitions of an element and an optional set of product representations. It is used to define an element specification (i.e. the specific product information, that is common to all occurrences of that product type). A transport element type is used to define the common properties of a certain type of a transport element that may be applied to many instances of that type to assign a specific style. Transport element types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcTransportElementType are represented by instances of IfcTransportElement (or its subtypes).",
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"predefined_types": {
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"ELEVATOR": "Elevator or lift being a transport device to move people of good vertically.",
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|
"ESCALATOR": "Escalator being a transport device to move people. It consists of individual linked steps that move up and down on tracks while keeping the threads horizontal.",
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|
"MOVINGWALKWAY": "Moving walkway being a transport device to move people horizontally or on an incline. It is a slow conveyor belt that transports people.",
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"NOTDEFINED": "",
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|
"USERDEFINED": ""
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|
},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifctransportelementtype.htm"
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|
},
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|
"IfcTrapeziumProfileDef": {
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|
"attributes": {
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|
"BottomXDim": "The extent of the bottom line measured along the implicit x-axis.",
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|
"TopXDim": "The extent of the top line measured along the implicit x-axis.",
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|
"TopXOffset": "Offset from the beginning of the top line to the bottom line, measured along the implicit x-axis.",
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|
"YDim": "The extent of the distance between the parallel bottom and top lines measured along the implicit y-axis."
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},
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|
"description": "Definition from IAI: The IfcTrapeziumProfileDef defines a trapezium as the profile definition used by the swept surface geometry or the swept area solid. It is given by its Top X and Bottom X extent and its Y extent as well as by the offset of the Top X extend, and placed within the 2D position coordinate system, established by the Position attribute. It is placed centric within the position coordinate system, i.e. in the center of the bounding box. Illustration: Table: Parameter of trapezium profile definition",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifctrapeziumprofiledef.htm"
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},
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|
"IfcTrimmedCurve": {
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|
"attributes": {
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|
"BasisCurve": "The curve to be trimmed. For curves with multiple representations any parameter values given as Trim1 or Trim2 refer to the master representation of the BasisCurve only.",
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|
"MasterRepresentation": "Where both parameter and point are present at either end of the curve this indicates the preferred form.",
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|
"SenseAgreement": "Flag to indicate whether the direction of the trimmed curve agrees with or is opposed to the direction of the basis curve.",
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|
"Trim1": "The first trimming point which may be specified as a Cartesian point, as a real parameter or both.",
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|
"Trim2": "The second trimming point which may be specified as a Cartesian point, as a real parameter or both."
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|
},
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|
"description": "Definition from ISO/CD 10303-42:1992: A trimmed curve is a bounded curve which is created by taking a selected portion, between two identified points, of the associated basis curve. The basis curve itself is unaltered and more than one trimmed curve may reference the same basis curve. Trimming points for the curve may be identified by: - parametric value - geometric position - both of the above At least one of these shall be specified at each end of the curve. The SenseAgreement makes it possible to unambiguously define any segment of a closed curve such as a circle. The combinations of sense and ordered end points make it possible to define four distinct directed segments connecting two different points on a circle or other closed curve. For this purpose cyclic properties of the parameter range are assumed; for example, 370 degrees is equivalent to 10 degrees. The IfcTrimmedCurve has a parameterization which is inherited from the particular basis curve reference. More precisely the parameter s of the trimmed curve is derived from the parameter of the basis curve as follows: - if SenseAgreement is TRUE: s = t - t~1~ - if SenseAgreement is FALSE: s = t~2~ - t In the above equations t~1~ is the value given by Trim1 or the parameter value corresponding to point 1 and t~2~ is the value given by Trim2 or the parameter value corresponding to point 2. The resultant IfcTrimmedCurve has a parameter ranging from 0 at the first trimming point to |t~2~ - t~1~| at the second trimming point. Informal Propositions: - Where both the parameter value and the Cartesian point exist for Trim1 and Trim2 they shall be consistent. (i.e., the BasisCurve evaluated at the parameter value shall coincide with the specified point). - When a Cartesian point is specified by Trim1 or by Trim2 it shall lie on the BasisCurve. - Except the case of a closed BasisCurve where both parameter 1 and parameter 2 exist, they shall be consistent with the sense flag, i.e., (sense = parameter 1 < parameter 2). Or, for every open curve where both parameter 1 and parameter 2 exist, they shall be consistent with the SenseAgreement, i.e., SenseAgreement = (parameter 1 < parameter 2). - If both parameter 1 and parameter 2 exist, then parameter 1 <> parameter 2. For a closed base curve, e.g. IfcCircle or IfcEllipse, this also applies to the cyclic properties, as 360' is equal to 0', parameter 1 = 360' and parameter 2 = 0' are treated as being equal and therefore violating this proposition. - When a parameter value is specified by Trim1 or Trim2 it shall lie within the parametric range of the BasisCurve. Additional illustration from IAI:",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifctrimmedcurve.htm"
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|
},
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|
"IfcTubeBundleType": {
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|
"description": "The element type IfcTubeBundleType defines a list of commonly shared property set definitions of a tube buncle and an optional set of product representations. It is used to define a tube bundle specification (i.e. the specific product information, that is common to all occurrences of that product type). A tube bundle type is used to define the common properties of a tube bundle that may be applied to many occurrences of that type. A tube bundle is a device consisting of tubes and bundles of tubes used for heat transfer and contained typically within other energy conversion devices, such as a chiller or coil. The occurrences of the IfcTubeBundleType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_TubeBundleTypeCommon: common property set for all tube bundle types Pset_TubeBundleTypeFinned: property set for finned tube bundle types",
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|
"predefined_types": {
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|
"FINNED": "Finned tube bundle type.",
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|
"NOTDEFINED": "Undefined tube bundle type.",
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|
"USERDEFINED": "User-defined tube bundle type."
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|
},
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifctubebundletype.htm"
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|
},
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|
"IfcTwoDirectionRepeatFactor": {
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|
"attributes": {
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|
"SecondRepeatFactor": "A vector which specifies the relative positioning of tiles in the second direction."
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|
},
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|
"description": "Definition from ISO/CD 10303-46:1992: A two direction repeat factor combines two vectors which are used in the fill area style tiles entity for determining the shape and relative location of tiles. Given the initial position of any tile, the two direction repeat factor determines eight new positions according to the equation:",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifctwodirectionrepeatfactor.htm"
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|
},
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"IfcTypeObject": {
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|
"attributes": {
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|
"ApplicableOccurrence": "The attribute optionally defines the data type of the occurrence object, to which the assigned type object can relate. If not present, no instruction is given to which occurrence object the type object is applicable.",
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|
"HasPropertySets": "Set ~~list~~ of unique property sets, that are associated with the object type and are common to all object occurrences referring to this object type.",
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|
"ObjectTypeOf": "Reference to the relationship IfcRelDefinedByType and thus to those occurrence objects, which are defined by this type."
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|
},
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|
"description": "The object type (IfcTypeObject) defines the specific information about a type. It refers to the specific level of the well recognized generic - specific - occurrence modeling paradigm. The object style is represented by a list of property set definitions, where the order in the list implies a decreasing generality. The list of property sets describes the available specific information about the object type. Thereby the object type is used to define the common properties of a certain type (or style) of an object that may be applied to multiple instances of the same type. The IfcTypeObject gets assigned to the individual object instances (the occurrences) via the IfcRelDefinesByType relationship. Object types may be exchanged without being already assigned to objects. An object type may have an indication of the library (or catalogue) from which its definition originates. This association is handled by the inherited HasAssociations relationship.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifctypeobject.htm"
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},
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"IfcTypeProduct": {
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|
"attributes": {
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|
"RepresentationMaps": "List of unique representation maps. Each representation map describes a block definition of the shape of the product style. By providing more than one representation map, a multi-view block definition can be given.",
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|
"Tag": "The tag (or label) identifier at the particular type of a product, e.g. the article number (like the EAN). It is the identifier at the specific level."
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|
},
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|
"description": "The product type (IfcTypeProduct) defines a list of property set definitions of a product and an optional set of product representations. It is used to define a product specification (i.e. the specific product information, that is common to all occurrences of that product type). A product type is used to define the common properties of a certain type or style of an object that may be applied to instances of those products to assign a specific style to them. Product types may be exchanges without being already assigned to products.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifctypeproduct.htm"
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},
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|
"IfcUShapeProfileDef": {
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|
"attributes": {
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|
"CentreOfGravityInX": "Location of centre of gravity along the x axis measured from the center of the bounding box.",
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|
"Depth": "Web lengths, see illustration above (= h).",
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|
"EdgeRadius": "Edge radius according the above illustration (= r2). If it is not given, zero is assumed.",
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|
"FilletRadius": "Fillet radius according the above illustration (= r1). If it is not given, zero is assumed.",
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|
"FlangeSlope": "Slope of flange of the profile. If it is not given, zero is assumed.",
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|
"FlangeThickness": "Constant wall thickness of flange (= tg).",
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|
"FlangeWidth": "Flange lengths, see illustration above (= b).",
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|
"WebThickness": "Constant wall thickness of web (= ts)."
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|
},
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|
"description": "The IfcUShapeProfileDef defines a section profile that provides the defining parameters of a U-shape (channel) section to be used by the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration. The centre of the position coordinate system is in the\\^profiles centre of the ~~gravity~~ bounding box. The centre of gravity, if given, is located in y direction within the center of the bounding box, and in x-direction along the negative x axis, the offset value is given by the offset parameter CentreOfGravityInX. Illustration: Table: Parameters of U-shape profile definition",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcushapeprofiledef.htm"
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|
},
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|
"IfcUnitAssignment": {
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|
"attributes": {
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|
"Units": "Units to be included within a unit assignment."
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|
},
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|
"description": "A set of units which may be assigned. Within an IfcUnitAssigment each unit definition shall be unique. I.e. there shall be no redundant unit definitions for the same unit type, like length unit, area unit etc. For currencies, there shall be only a single IfcMonetaryUnit within an IfcUnitAssignment.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcunitassignment.htm"
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|
},
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|
"IfcUnitaryEquipmentType": {
|
|
"description": "The element type IfcUnitaryEquipmentType defines a list of commonly shared property set definitions of a unitary equipment element and an optional set of product representations. It is used to define a unitary equipment element specification (i.e. the specific product information, that is common to all occurrences of that product type). A unitary equipment type is used to define the common properties of unitary equipment that may be applied to many occurrences of that type. Unitary equipment typically combine a number of components into a single product, such as pre-packaged rooftop air-conditioning units, split systems, etc. Unitary equipment types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcUnitaryEquipmentType are represented by instances of IfcEnergyConversionDevice or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release:",
|
|
"predefined_types": {
|
|
"AIRCONDITIONINGUNIT": "A unitary packaged air-conditioning unit typically used in residential or light commercial applications.",
|
|
"AIRHANDLER": "A unitary air handling unit typically containing a fan, economizer, and coils.",
|
|
"NOTDEFINED": "Undefined unitary equipment type.",
|
|
"ROOFTOPUNIT": "A packaged assembly that is either field-erected or manufactured atop the roof of a large residential or commercial building and acts as a unitary component.",
|
|
"SPLITSYSTEM": "A system which separates the compressor from the evaporator, but acts as a unitary component typically within residential or light commercial applications.",
|
|
"USERDEFINED": "User-defined unitary equipment type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcunitaryequipmenttype.htm"
|
|
},
|
|
"IfcValveType": {
|
|
"description": "The element type IfcValveType defines a list of commonly shared property set definitions of a valve and an optional set of product representations. It is used to define a valve specification (i.e. the specific product information, that is common to all occurrences of that product type). A valve type is used to define the common properties of a valve that may be applied to many occurrences of that type. Valves are typically is used in a building services piping distribution system to control or modulate the flow of the fluid. Valve types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcValveType are represented by instances of IfcFlowController or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_ValveTypeCommon: common property set for all valve types Pset_ValveTypeAirRelease: property set for air release valve types Pset_ValveTypeDrawOffCock: property set for draw off cock valve types Pset_ValveTypeFaucet: property set for faucet valve types Pset_ValveTypeFlushing: property set for flushing valve types Pset_ValveTypeGasTap: property set for gas tap valve types Pset_ValveTypeIsolating: property set for isolating valve types Pset_ValveTypeMixing: property set for mixing valve types Pset_ValveTypePressureReducing: property set for pressure reducing valve types Pset_ValveTypePressureRelief: property set for pressure relief valve types",
|
|
"predefined_types": {
|
|
"AIRRELEASE": "Valve used to release air from a pipe or fitting.",
|
|
"ANTIVACUUM": "Valve that opens to admit air if the pressure falls below atmospheric pressure.",
|
|
"CHANGEOVER": "Valve that enables flow to be switched between pipelines (3 or 4 port).",
|
|
"CHECK": "Valve that permits water to flow in one direction only and is enclosed when there is no flow (2 port).",
|
|
"COMMISSIONING": "Valve used to facilitate commissioning of a system (2 port).",
|
|
"DIVERTING": "Valve that enables flow to be diverted from one branch of a pipeline to another (3 port).",
|
|
"DOUBLECHECK": "An assembly that incorporates two valves used to prevent backflow.",
|
|
"DOUBLEREGULATING": "Valve used to facilitate regulation of fluid flow in a system.",
|
|
"DRAWOFFCOCK": "A valve used to remove fluid from a piping system.",
|
|
"FAUCET": "Faucet valve typically used as a flow discharge.",
|
|
"FLUSHING": "Valve that flushes a predetermined quantity of water to cleanse a toilet, urinal, etc.",
|
|
"GASCOCK": "Valve that is used for controlling the flow of gas.",
|
|
"GASTAP": "Gas tap typically used for venting or discharging gas from a system.",
|
|
"ISOLATING": "Valve that closes off flow in a pipeline.",
|
|
"MIXING": "Valve that enables flow from two branches of a pipeline to be mixed together (3 port).",
|
|
"NOTDEFINED": "Undefined valve type.",
|
|
"PRESSUREREDUCING": "Valve that reduces the pressure of a fluid immediately downstream of its position in a pipeline to a preselected value or by a predetermined ratio.",
|
|
"PRESSURERELIEF": "Spring or weight loaded valve that automatically discharges to a safe place fluid that has built up to excessive pressure in pipes or fittings.",
|
|
"REGULATING": "Valve used to facilitate regulation of fluid flow in a system.",
|
|
"SAFETYCUTOFF": "Valve that closes under the action of a safety mechanism such as a drop weight, solenoid etc.",
|
|
"STEAMTRAP": "Valve that restricts flow of steam while allowing condensate to pass through.",
|
|
"STOPCOCK": "An isolating valve used on a domestic water service.",
|
|
"USERDEFINED": "User-defined valve type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcvalvetype.htm"
|
|
},
|
|
"IfcVector": {
|
|
"attributes": {
|
|
"Dim": "The space dimensionality of this class, it is derived from Orientation Orientation.Dim",
|
|
"Magnitude": "The magnitude of the vector. All vectors of Magnitude 0.0 are regarded as equal in value regardless of the orientation attribute.",
|
|
"Orientation": "The direction of the vector."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: The vector is defined in terms of the direction and magnitude of the vector. The value of the magnitude attribute defines the magnitude of the vector.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcvector.htm"
|
|
},
|
|
"IfcVertex": {
|
|
"description": "Definition from ISO/CD 10303-42:1992: A vertex is the topological construct corresponding to a point. It has dimensionality 0 and extent 0. The domain of a vertex, if present, is a point in m dimensional real space R^M^; this is represented by the vertex point subtype. Informal proposition: - The vertex has dimensionality 0. This is a fundamental property of the vertex. - The extent of a vertex is defined to be zero.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcvertex.htm"
|
|
},
|
|
"IfcVertexBasedTextureMap": {
|
|
"attributes": {
|
|
"TexturePoints": "Reference to a list of polyloop's defining a face bound of a face within a vertex based geometry.",
|
|
"TextureVertices": "List of texture vertex coordinates, each texture vertex refers to the Cartesian point within the polyloop (corresponding lists). The first coordinate[1] is the S, the second coordinate[2] is the T parameter value."
|
|
},
|
|
"description": "Definition from IAI: An IfcVertexBasedTextureMap provides the mapping of the 2-dimensional texture coordinates (S, T) to the vertices of a single surface onto which it is mapped. For each vertex coordinates, provided by IfcCartesianPoin, a set of 2 (S, T) texture coordinates are given. The IfcVertexBasedTextureMap provides two corresponding lists: - a list of TexturePoints, given by min. of 3 IfcCartesianPoint's. - a list of TextureVertices, given by min. of 3 IfcTextureVertex's. These corresponding lists are: Each texture vertex (given as S, T coordinates of 2 dimension) corresponds to the geometric coordinates (given as X, Y, and Z coordinates of 3 dimensions) of the Cartesian point, All Cartesian points within the list of shall lie within a plane. Informal propositions: - The list of TextureVertices shall correspond to the list of TexturePoints. - All Cartesian points of the list of _TexturePoints_shall lie in one plane - The references points shall be part of the vertex based geometry to which the annotation surface with textures is assigned.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcvertexbasedtexturemap.htm"
|
|
},
|
|
"IfcVertexLoop": {
|
|
"attributes": {
|
|
"LoopVertex": "The vertex which defines the entire loop."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A vertex_loop is a loop of zero genus consisting of a single vertex. A vertex can exist independently of a vertex loop. The topological data shall satisfy the following constraint: Informal propositions: - A vertex loop has zero extent and dimensionality. - The vertex loop has genus 0.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcvertexloop.htm"
|
|
},
|
|
"IfcVertexPoint": {
|
|
"attributes": {
|
|
"VertexGeometry": "The geometric point, which defines the position in geometric space of the vertex."
|
|
},
|
|
"description": "Definition from ISO/CD 10303-42:1992: A vertex point is a vertex which has its geometry defined as a point. Informal proposition: - The domain of the vertex is formally defined to be the domain of its vertex point.",
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcvertexpoint.htm"
|
|
},
|
|
"IfcVibrationIsolatorType": {
|
|
"description": "The element type IfcVibrationIsolatorType defines a list of commonly shared property set definitions of a vibration isolator and an optional set of product representations. It is used to define a vibration isolator specification (i.e. the specific product information, that is common to all occurrences of that product type). A vibration isolator type is used to define the common properties of an isolator that may be applied to many occurrences of that type. A vibration isolator is a device used to minimize the effects of vibration transmissibility in a building. Isolator types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences. The occurrences of the IfcVibrationIsolatorType are represented by instances of IfcEquipmentElement or its subtypes. *Property Set Use Definition*: The property sets relating to this entity are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to this entity are part of this IFC release: - Pset_VibrationIsolatorTypeCommon: common property set for all vibration isolator types",
|
|
"predefined_types": {
|
|
"COMPRESSION": "Compression type vibration isolator.",
|
|
"NOTDEFINED": "Undefined vibration isolator type.",
|
|
"SPRING": "Spring type vibration isolator.",
|
|
"USERDEFINED": "User-defined vibration isolator type."
|
|
},
|
|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcvibrationisolatortype.htm"
|
|
},
|
|
"IfcVirtualElement": {
|
|
"description": "A special element used to provide imaginary boundaries, such as between two adjacent, but not separated, spaces. Virtual elements are usually not displayed and does not have quantities and other measures. Therefore IfcVirtualElement does not have material information and quantities attached. *Geometry Use Definitions* The geometric representation of any IfcVirtualElement is given by the IfcProductDefinitionShape and IfcLocalPlacement allowing multiple geometric representations. Local Placement The local placement for IfcVirtualElement is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations. - The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level. - If the relative placement is not used, the absolute placement is defined within the world coordinate system. Geometric Representations Currently, the use of 'FootPrint' and 'Surface' representation is supported. Two-dimensional Representation using foot print representation The 2D geometric representation of IfcVirtualElement is defined using the 'FootPrint' or 'Surface' representation. The following attribute values should be inserted - IfcShapeRepresentation.RepresentationIdentifier = 'FootPrint'. - IfcShapeRepresentation.RepresentationType = 'Curve2D' or 'GeometricCurveSet' . The following constraints apply to the 2D curve representation: - Curve: IfcPolyline, IfcTrimmedCurve or IfcCompositeCurve Three-dimensional Representation using surface model representation The 3D geometric representation of IfcVirtualElement is defined using the 'SurfaceModel' geometry. The following attribute values should be inserted - IfcShapeRepresentation.RepresentationIdentifier = 'Surface'. - IfcShapeRepresentation.RepresentationType = 'GeometricSet . The following constraints apply to the 3D surface representation: - Surface: IfcSurfaceOfLinearExtrusion - Profile: IfcArbitraryOpenProfileDef - Extrusion: The extrusion direction shall be vertically, i.e., along the positive Z Axis of the co-ordinate system of the containing spatial structure element.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcvirtualelement.htm"
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},
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"IfcVirtualGridIntersection": {
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"attributes": {
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"IntersectingAxes": "Two grid axes which intersects at exactly one intersection (see also informal proposition at IfcGrid). If attribute OffsetDistances is omitted, the intersection defines the placement or ref direction of a grid placement directly. If OffsetDistances are given, the intersection is defined by the offset curves to the grid axes.",
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"OffsetDistances": "Offset distances to the grid axes. If given, it defines virtual offset curves to the grid axes. The intersection of the offset curves specify the virtual grid intersection."
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},
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"description": "The IfcVirtualGridIntersection defines the derived location of the intersection between two grid axes. Offset values may be given to set an offset distance to the grid axis for the calculation of the virtual grid intersection. The two intersecting axes (IntersectingAxes) define the intersection point, which exact location (in terms of the Cartesian point representing the intersection) has to be calculated from the geometric representation of the two participating curves. Offset values may be given (OffsetDistances). If given, the position within the list of OffsetDistances corresponds with the position within the list of IntersectingAxes. Therefore: - OffsetDistances[1] sets the offset to IntersectingAxes[1], - OffsetDistances[2] sets the offset to IntersectingAxes[2], and - OffsetDistances[3] sets the offset to the virtual intersection in direction of the orientation of the cross product of IntersectingAxes[1] and the orthogonal complement of the IntersectingAxes[1] (which is the positive or negative direction of the z axis of the design grid position). *Geometry use definitions*: The following figures explain the usage of the OffsetDistances and IntersectingAxes attributes. The distance of the offset curve (OffsetDistances[n]) is measured from the basis curve. The distance may be positive, negative or zero. A positive value of distance defines an offset in the direction which is normal to the curve in the sense of an anti-clockwise rotation through 90 degrees from the tangent vector T at the given point. (This is in the direction of orthogonal complement(T).) This can be reverted by the SameSense attribute at IfcGridAxis which may switch the sense of the AxisCurve. Illustration",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcvirtualgridintersection.htm"
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},
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"IfcWall": {
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"description": "Definition from ISO 6707-1:1989: Vertical construction usually in masonry or in concrete which bounds or subdivides a construction works and fulfills a load bearing or retaining function.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwall.htm"
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},
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"IfcWallStandardCase": {
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"description": "The standard wall (IfcWallStandardCase) defines a wall with certain constraints for the provision of parameters and with certain constraints for the geometric representation. The IfcWallStandardCase handles all cases of walls, that are extruded vertically - along the positive z axis of the wall local placement coordinate system, and - along the positive z axis of the global (world) coordinate system and have a single thickness along the path, i.e.: - parallel sides for straight walls - co-centric sides for curved walls. The following parameter shall be given: - Wall height, taken from the depth of extrusion, provided by the geometric representation. - Wall thickness, taken from the material layer set usage, attached to the wall - Wall offset from axis, taken from the material layer set usage, attached to the wall The material of the wall is defined by the IfcMaterialLayerSetUsage and is attached by the IfcRelAssociatesMaterial objectified relationship. It is accessible by the inverse HasAssociations relationship. The material layer set usage has to be given (enforced by where rule). *Type Use Definition* The type information relating to the IfcWallStandardCase is defined at the supertype IfcWall. As an additional use agreement for standard walls, the IfcWallType should have a unique IfcMaterialLayerSet, that is referenced by the IfcMaterialLayerSetUsage assigned to all occurrences of this IfcWallType. *Property Set Use Definition*: The property sets relating to the IfcWallStandardCase are defined at the supertype IfcWall. *Quantity Use Definition*: The quantities relating to the IfcWallStandardCase are defined at the supertype IfcWall. *Geometry Use Definitions*: The geometric representation of IfcWallStandardCase is given by the IfcProductDefinitionShape, allowing multiple geometric representation. Included are: Local Placement The use of local placement is defined at the supertype IfcWall. Geometric Representation The standard geometric representation of IfcWallStandardCase is defined using the following multiple shape representations for its definition: - Axis: A two-dimensional open curve (IfcBoundedCurve) defining the axis for the standard wall. The material layer offset is measured from the wall axis. - Body: A Swept Solid Representation or a CSG representation defining the 3D shape of the standard wall First representation: Curve2D representation of wall axis The wall axis is represented by a two-dimensional open curve within a particular shape representation. The wall axis is used to apply the parameter to the wall geometry. The following attribute values shall be used Second representation: SweptSolid or Clipping representation of wall body The body of the IfcWallStandardCase is defined by using 'SweptSolid' representation for walls without clippings or 'Clipping' representation for walls with clippings (e.g. under sloped roof slabs). SweptSolid representation The standard geometric representation (for body) of IfcWallStandardCase is defined using the 'SweptSolid' representation. The following additional constraints apply to the swept solid representation: - Solid: IfcExtrudedAreaSolid is required, - Profile: IfcArbitraryClosedProfileDef and IfcRectangleProfileDef shall be supported. - Extrusion: The profile shall be extruded vertically, i.e., in the direction of the z-axis of the co-ordinate system of the referred spatial structure element. It might be further constraint to be in the direction of the global z-axis in implementers agreements. The extrusion axis shall be perpendicular to the swept profile, i.e. pointing into the direction of the z-axis of the Position of the IfcExtrudedAreaSolid. The advanced geometric representation (for body) of IfcWallStandardCase is defined using the 'Clipping' representation. The following additional constraints apply to the swept solid representation: - Solid: see standard geometric representation - Profile: see standard geometric representation - Extrusion: see standard geometric representation - Boolean result: The IfcBooleanClippingResult shall be supported, allowing for Boolean differences between the swept solid (here IfcExtrudedAreaSolid) and one or several IfcHalfSpaceSolid (or subtypes).",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwallstandardcase.htm"
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},
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"IfcWallType": {
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"description": "The element type (IfcWallType) defines a list of commonly shared property set definitions of a wall and an optional set of product representations. It is used to define an element specification (i.e. the specific product information, that is common to all occurrences of that product type). An IfcWallType is used to define the common properties of a certain type of a wall that may be applied to many instances of that type to assign a specific style. Wall types may be exchanged without being already assigned to occurrences. The IfcWallType can have common material (using the inverse relationship HasAssociations) or property set information (using HasPropertySets) assigned. If present, it does apply equally to all occurrences of the IfcWallType. Property set information may be overridden at the occurrence. The occurrences of the IfcWallType are represented by instances of IfcWall and IfcWallStandardCase. Informal proposition: - The material assignment, if provided using the IfcRelAssociatesMaterial relationship, shall not reference the IfcMaterialLayerSetUsage.",
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"predefined_types": {
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"ELEMENTEDWALL": "A stud wall framed with studs and faced with sheetings, sidings, wallboard, or plasterwork.",
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"NOTDEFINED": "Undefined wall element.",
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"PLUMBINGWALL": "A pier, or enclosure, or encasement, normally used to enclose plumbing in sanitary rooms. Such walls often do not extent to the ceiling.",
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"POLYGONAL": "A polygonal wall, extruded vertically, where the wall thickness varies along the wall path.\n{ .deprecated}\n> IFC4 DEPRECATION The enumerator POLYGONAL is deprecated and shall no longer be used.",
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"SHEAR": "A wall designed to withstand shear loads. Such shear walls are often designed having a non-rectangular cross section along the wall path. Also called retaining walls or supporting walls they are used to protect against soil layers behind.",
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"STANDARD": "A standard wall, extruded vertically with a constant thickness along the wall path.",
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"USERDEFINED": "User-defined wall element."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwalltype.htm"
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},
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"IfcWasteTerminalType": {
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"description": "The IfcWasteTerminalType defines a particular type of sanitary flow that has the purpose of collecting or intercepting waste from one or more sanitary terminals or other fluid waste generating equipment and discharging it into a single waste/drainage system. *Use Definitions* An IfcWasteTerminalType provides for all forms of trap, waste point and interceptor that collects discharge from a sanitary terminal and discharges it into a waste/drainage subsystem or that collects waste from several terminals and passes it into a single waste/drainage subsystem. This includes the P and S traps from soil sanitary terminals, sinks, basins etc. as well as floor wastes, gully traps and interceptors that provide collection points. An IfcWasteTerminalType may be included into the spatial context of the building model through an (or multiple) instances of IfcFlowTerminal. The parameters of the waste terminal type are defined through the type driven property sets referred to by the predefined type attribute of IfcWasteTerminalType. *Property Set Use Definition*: The property sets relating to the IfcWasteTerminalType_are defined by the _IfcPropertySet and attached by the IfcRelDefinesByType relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to an IfcWasteTerminalType are part of this IFC release: - Pset_WasteTerminalTypeFloorTrap: specific property set for the properties of a floor trap, if available - Pset_WasteTerminalTypeFloorWaste: specific property set for the properties of a floor waste unit, if available - Pset_WasteTerminalTypeGreaseInterceptor: specific property set for the properties of a grease interceptor, if available - Pset_WasteTerminalTypeGullySump: specific property set for the properties of a gully sump, if available - Pset_WasteTerminalTypeGullyTrap: specific property set for the properties of a gully trap, if available - Pset_WasteTerminalTypeOilInterceptor: specific property set for the properties of an oil interceptor, if available - Pset_WasteTerminalTypePetrolInterceptor: specific property set for the properties of a petrol interceptor, if available - Pset_WasteTerminalTypeRoofDrain: specific property set for the properties of a roof drain, if available - Pset_WasteTerminalTypeWasteDisposalUnit: specific property set for the properties of a waste disposal unit, if available - Pset_WasteTerminalTypeWasteTrap: specific property set for the properties of a waste trap, if available *Geometry Use Definitions* Representations of the type are defined as representation maps (at the level of the supertype IfcTypeProduct). These are assigned at the occurrence through the IfcShapeRepresentation.Item being an IfcMappedItem.",
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"predefined_types": {
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"FLOORTRAP": "Pipe fitting, set into the floor, that retains liquid to prevent the passage of foul air",
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"FLOORWASTE": "Pipe fitting, set into the floor, that collects waste water and discharges it to a separate trap.",
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"GREASEINTERCEPTOR": "",
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"GULLYSUMP": "Pipe fitting or assembly of fittings to receive surface water or waste water, fitted with a grating or sealed cover.",
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"GULLYTRAP": "Pipe fitting or assembly of fittings that receives surface water or waste water; fitted with a grating or sealed cover that discharges water through a trap.",
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"NOTDEFINED": "Undefined type.",
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"OILINTERCEPTOR": "",
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"PETROLINTERCEPTOR": "",
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"ROOFDRAIN": "Pipe fitting, set into the roof, that collects rainwater for discharge into the rainwater system.",
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"USERDEFINED": "User-defined type.",
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"WASTEDISPOSALUNIT": "Electrically operated device that reduces kitchen or other waste into fragments small enough to be flushed into a drainage system.",
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"WASTETRAP": "Pipe fitting, set adjacent to a sanitary terminal, that retains liquid to prevent the passage of foul air."
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},
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcplumbingfireprotectiondomain/lexical/ifcwasteterminaltype.htm"
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},
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"IfcWaterProperties": {
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"attributes": {
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"AcidityConcentration": "Maximum CaCO~3~ equivalent that would neutralize the acid.",
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"AlkalinityConcentration": "Maximum alkalinity concentration (maximum sum of concentrations of each of the negative ions substances measured as CaCO~3~).",
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"DissolvedSolidsContent": "Fraction of the dissolved solids to the total amount of water. This is measured in weight of dissolved solids per weight of water and is therefore unitless.",
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"Hardness": "Water hardness as positive, multivalent ion concentration in the water (usually concentrations of calcium and magnesium ions in terms of calcium carbonate).",
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"ImpuritiesContent": "Fraction of impurities such as dust to the total amount of water. This is measured in weight of impurities per weight of water and is therefore unitless.",
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"IsPotable": "If TRUE, then the water is considered potable.",
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"PHLevel": "Maximum water ph in a range from 0-14."
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},
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"description": "Common definition to capture the properties of water typically used within the context of building services and flow distribution systems.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcwaterproperties.htm"
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},
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"IfcWindow": {
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"attributes": {
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"OverallHeight": "Overall measure of the height, it reflects the Z Dimension of a bounding box, enclosing the ~~body of the~~ window opening. If omitted, the _OverallHeight_ should be taken from the geometric representation of the _IfcOpening_ in which the window is inserted. > NOTE The body of the window might be taller then the window opening (e.g. in cases where the window lining includes a casing). In these cases the OverallHeight shall still be given as the window opening height, and not as the total height of the window lining.",
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"OverallWidth": "Overall measure of the width, it reflects the X Dimension of a bounding box, enclosing the ~~body of the~~ window opening. If omitted, the _OverallWidth_ should be taken from the geometric representation of the _IfcOpening_ in which the window is inserted. > NOTE The body of the window might be wider then the window opening (e.g. in cases where the window lining includes a casing). In these cases the OverallWidth shall still be given as the window opening width, and not as the total width of the window lining."
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},
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"description": "Definition form ISO 6707-1:1989: Construction for closing a vertical or near vertical opening in a wall or pitched roof that will admit light and may admit fresh air.",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwindow.htm"
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},
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"IfcWindowLiningProperties": {
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"attributes": {
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"FirstMullionOffset": "Offset of the mullion centerline, measured along the x-axis of the window placement co-ordinate system. An offset value = 0.5 indicates that the mullion is positioned in the middle of the window.",
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"FirstTransomOffset": "Offset of the transom centerline, measured along the z-axis of the window placement co-ordinate system. An offset value = 0.5 indicates that the transom is positioned in the middle of the window.",
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"LiningDepth": "Depth of the window lining (dimension measured perpendicular to window elevation plane).",
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"LiningThickness": "Thickness of the window lining (measured parallel to the window elevation plane).",
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"MullionThickness": "Thickness of the mullion (vertical separator of window panels within a window), measured parallel to the window elevation plane. The mullion is part of the lining and the mullion depth is assumed to be identical to the lining depth.",
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"SecondMullionOffset": "Offset of the mullion centerline for the second mullion, measured along the x-axis of the window placement co-ordinate system. An offset value = 0.666 indicates that the second mullion is positioned at two/third of the window.",
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"SecondTransomOffset": "Offset of the transom centerline for the second transom, measured along the x-axis of the window placement co-ordinate system. An offset value = 0.666 indicates that the second transom is positioned at two/third of the window.",
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"ShapeAspectStyle": "Optional link to a shape aspect definition, which points to the part of the geometric representation of the window style, which is used to represent the lining.",
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"TransomThickness": "Thickness of the transom (horizontal separator of window panels within a window), measured parallel to the window elevation plane. The transom is part of the lining and the transom depth is assumed to be identical to the lining depth."
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},
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"description": "The window lining is the frame which enables the window to be fixed in position. The window lining is used to hold the window panels or other casements. The parameter of the window lining (IfcWindowLiningProperties) define the geometrically relevant parameter of the lining. The IfcWindowLiningProperties are included in the list of properties (HasPropertySets) of the IfcWindowStyle. More information about the window lining can be included in the same list of the IfcWindowStyle using the IfcPropertySet for dynamic extensions. *Geometry Use Definitions* The IfcWindowLiningProperties does not hold an own geometric representation. However it defines parameter, which can be used to create the shape of the window style (which is inserted by the IfcWindow into the spatial context of the project). Interpretation of parameter The parameters at the IfcWindowLiningProperties define a standard window lining, including (if given) a mullion and a transom (for horizontal and vertical splits). The outer boundary of the lining is determined by the occurrence parameter assigned to the IfcWindow, which inserts the IfcWindowStyle. NOTE - All offsets are given as a normalized ratio measure.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwindowliningproperties.htm"
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},
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"IfcWindowPanelProperties": {
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"attributes": {
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|
"FrameDepth": "Depth of panel frame, measured from front face to back face horizontally (i.e. perpendicular to the window (elevation) plane.",
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|
"FrameThickness": "Width of panel frame, measured from inside of panel (at glazing) to outside of panel (at lining), i.e. parallel to the window (elevation) plane.",
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"OperationType": "Types of window panel operations. Also used to assign standard symbolic presentations according to national building standards.",
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"PanelPosition": "Position of this panel within the overall window style.",
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"ShapeAspectStyle": "Optional link to a shape aspect definition, which points to the part of the geometric representation of the window style, which is used to represent the panel."
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|
},
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|
"description": "A description of the window panel. A window panel is a casement, i.e. a component, fixed or opening, consisting essentially of a frame and the infilling. The infilling of a window panel is normally glazing. The way of operation is defined in the operation type. The IfcWindowPanelProperties are included in the list of properties (HasPropertySets) of the IfcWindowStyle. More information about the window panel can be included in the same list of the IfcWindowStyle using the IfcPropertySet for dynamic extensions. *Geometry Use Definitions* The IfcWindowPanelProperties does not hold an own geometric representation. However it defines parameter, which can be used to create the shape of the IfcWindowStyle (which is inserted by the IfcWindow into the spatial context of the project). Interpretation of parameter The parameters at the IfcWindowPanelProperties define a standard window panel. The outer boundary of the panel is determined by the occurrence parameter assigned to the IfcWindow, which inserts the IfcWindowStyle. It has to take the lining parameter into account as well. The position of the window panel within the overall window is determined by the PanelPosition attribute.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwindowpanelproperties.htm"
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},
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"IfcWindowStyle": {
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|
"attributes": {
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"ConstructionType": "Type defining the basic construction and material type of the window.",
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|
"OperationType": "Type defining the general layout and operation of the window style.",
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|
"ParameterTakesPrecedence": "The Boolean value reflects, whether the parameter given in the attached lining and panel properties exactly define the geometry (TRUE), or whether the attached style shape take precedence (FALSE). In the last case the parameter have only informative value.",
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"Sizeable": "The Boolean indicates, whether the attached ShapeStyle can be sized (using scale factor of transformation), or not (FALSE). If not, the ShapeStyle should be inserted by the IfcWindow (using IfcMappedItem) with the scale factor = 1."
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},
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"description": "The window style defines a particular style of windows, which may be included into the spatial context of the building model through an (or multiple) instances of IfcWindow. A window style defines the overall parameter of the window style and refers to the particular parameter of the lining and one (or several) panels through the IfcWindowLiningProperties and the IfcWindowPanelProperties. The window entity (IfcWindow) defines a particular occurrence of a window inserted in the spatial context of a project. The actual parameter of the window and/or its shape is defined at the IfcWindowStyle, to which the IfcWindow related by the inverse relationship IsDefinedBy pointing to IfcRelDefinesByType. The IfcWindowStyle also defines the particular attributes for the lining (IfcWindowLiningProperties) and panels (IfcWindowPanelProperties). *Geometry Use Definitions*: The IfcWindowStyle defines the baseline geometry, or the representation map, for all occurrences of the window style, given by the IfcWindow, pointing to this style. The representation of the window style may be given by the agreed set of minimal parameters, defined for the window lining and the window panel(s), or it my be given by a geometric representation used by the IfcRepresentationMap. The attribute ParameterTakesPrecedence decides, whether the set of parameters can be used to exactly represent the shape of the window style (TRUE), or whether the attached IfcRepresentationMap holds the exact representation (FALSE). Interpretation of parameters The IfcWindowStyleOperationTypeEnum defines the general layout of the window style. Depending on the enumerator, the appropriate instances of IfcWindowLiningProperties and IfcWindowPanelProperties are attached in the list of HasPropertySets. See geometry use definitions there.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwindowstyle.htm"
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|
},
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|
"IfcWorkControl": {
|
|
"attributes": {
|
|
"CreationDate": "The date that the plan is created.",
|
|
"Creators": "The authors of the work plan.",
|
|
"Duration": "The total duration of the entire work schedule.",
|
|
"FinishTime": "The finish time of the schedule.",
|
|
"Identifier": "Identifier of the work plan, given by user.",
|
|
"Purpose": "A description of the purpose of the work schedule.",
|
|
"StartTime": "The start time of the schedule.",
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|
"TotalFloat": "The total time float of the entire work schedule.",
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|
"UserDefinedControlType": "A user defined work control type.",
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|
"WorkControlType": "Predefined work control types from which that required may be set."
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|
},
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|
"description": "An IfcWorkControl is an abstract supertype which captures information that is common to both IfcWorkPlan and IfcWorkSchedule Use Definitions A work control may have resources assigned to it, this is handled by the IfcRelAssignsToControl relationship. The assignment of tasks to the work control is handled by the IfcRelAssignsTasks relationship. The inherited attributes have the following meaning: IfcControl.Controls - references to the IfcRelAssignsTasks, that assign instances of IfcTask including time schedule controls. IfcObject.HasAssignments - references to the IfcRelAssignsToResources, that assigns an instance of IfcResource to the IfcWorkControl. The attribute IfcWorkControl.Purpose is used to define the purpose of either a work schedule or a work plan. In the case of IfcWorkPlan, the purpose attribute can be used to determine if the work plan is for cost estimating, task scheduling or some other defined purpose.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprocessextension/lexical/ifcworkcontrol.htm"
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|
},
|
|
"IfcWorkPlan": {
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|
"description": "An IfcWorkPlan represents work plans in a construction or a facilities management project. Use Definitions A work plan contains a set of work schedules for different purposes (including construction and facilities management). Through inheritance from IfcWorkControl, it also have references to all the activities (i.e. IfcTask) and resources used in the work schedules. A work plan has information such as start date, finish date, total free float, and so on. IfcWorkPlan can also refer to the construction project represented by the single IfcProject instance.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprocessextension/lexical/ifcworkplan.htm"
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|
},
|
|
"IfcWorkSchedule": {
|
|
"description": "An IfcWorkSchedule represents a task schedule in a work plan, which in turn can contain a set of schedules for different purposes. Use Definitions An IfcWorkSchedule includes a set of elements (created through relating schedule time controls to tasks) with references to the resources used for the tasks included in the work schedule. Additionally, through the IfcWorkControl abstract supertype, the actors creating the schedule can be specified and schedule time information such as start time, finish time, and total float of the schedule can also be specified. IfcWorkSchedule can reference a project (i.e. the single IfcProject instance). The documents of the IfcWorkSchedule can be referenced by the IfcRelAssociatesDocuments relationship. Moreover, a work schedule can include other work schedules as sub-items through IfcRelNests relationship.",
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|
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprocessextension/lexical/ifcworkschedule.htm"
|
|
},
|
|
"IfcZShapeProfileDef": {
|
|
"attributes": {
|
|
"Depth": "Web length, see illustration above (= h).",
|
|
"EdgeRadius": "Edge radius according the above illustration (= r2). If it is not given, zero is assumed.",
|
|
"FilletRadius": "Fillet radius according the above illustration (= r1). If it is not given, zero is assumed.",
|
|
"FlangeThickness": "Constant wall thickness of flange, see illustration above (= tg).",
|
|
"FlangeWidth": "Flange length, see illustration above (= b).",
|
|
"WebThickness": "Constant wall thickness of web, see illustration above (= ts)."
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|
},
|
|
"description": "Definition from IAI: The IfcZShapeProfileDef defines a section profile that provides the defining parameters of a Z-shape section to be used by the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration. The centre of the position coordinate system is in the profiles centre of the gravity bounding box. Illustration: Table: Parameters of Z-shape profile definition",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifczshapeprofiledef.htm"
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},
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"IfcZone": {
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"description": "A zone (IfcZone) is an aggregation of spaces, partial spaces or other zones. Zone structures may not be hierarchical (in contrary to the spatial structure of a project - see IfcSpatialStructureElement), i.e. one individual IfcSpace may be associated with zero, one, or several IfcZone's. IfcSpace's are aggregated into an IfcZone by using the objectified relationship IfcRelAssignsToGroup as specified at the supertype IfcGroup. Additional classifications of the IfcZone, as provided by a national classification system, can be assigned by using the IfcRelAssociatesClassification relationship. *Property Set Use Definition*: The property sets relating to the IfcZone are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcZone are part of this IFC release: - Pset_ZoneCommon: common property set for all types of zone - Pset_SpaceFireSafetyRequirements: common property set for all types of zones to capture the fire safety requirements - Pset_SpaceLightingRequirements: common property set for all types of zones to capture the lighting requirements - Pset_SpaceOccupancyRequirements: common property set for all types of zones to capture the occupancy requirements - Pset_SpaceThermalRequirements: common property set for all types of zones to capture the thermal requirements",
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"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifczone.htm"
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}
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} |