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IfcOpenShell/src/ifcopenshell-python/ifcopenshell/util/schema/ifc2x3_entities.json
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Andrej730 28aab490df IFC v2.3 json schema and parsing tool to regenerate it (#2501) 
* IFC v2.3 json schema and parsing tool to regenerate it

Added entities and propeties schema in json format.

ifc2x3_entities.json format:
entity_name -> description, url, attributes;
attributes format: attribute_name -> attribute_descrption

ifc2x3_properties.json format:
property_set_name -> property_name -> description, children
children format: child_property_name -> child_property_description.

Also added doc.py script that can generate the same json schema files but requires docs IFC 2.3 docs in the same folder (https://github.com/buildingSMART/IFC/tree/Ifc2.3.0.1)

* Moved all json schema files to /util/schema

* Moved json files back to /util/, changed doc.py export location

* Added specification urls for entities and properties

Added specification urls for entities and properties.
Also added a function to parse actual property sets domain from the website to generate specification urls (domain on website and on github do not match).

Schema structure was changed:

ifc2x3_entities.json format:
entity_name -> description, spec_url, attributes;
attributes format: attribute_name -> attribute_descrption

ifc2x3_properties.json format:
property_set_name -> properties, spec_url
properties format: property_name -> description, children_properties
children_properties format: child_property_name -> child_property_description.

ifc2x3_property_sets_domains.json format:
property_set_name -> ifc_domain
2022-10-15 07:14:34 +11:00

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{
"Ifc2DCompositeCurve": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifc2dcompositecurve.htm"
},
"IfcActionRequest": {
"attributes": {
"RequestID": "A unique identifier assigned to the request on receipt."
},
"description": "A unique identifier assigned to the request on receipt.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcactionrequest.htm"
},
"IfcActor": {
"attributes": {
"IsActingUpon": "Reference to the relationship that associates the actor to an object.",
"TheActor": "Information about the actor."
},
"description": "Reference to the relationship that associates the actor to an object.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcactor.htm"
},
"IfcActorRole": {
"attributes": {
"Description": "A textual description relating the nature of the role played by an actor.",
"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.",
"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."
},
"description": "A textual description relating the nature of the role played by an actor.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcactorrole.htm"
},
"IfcActuatorType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of actuator from which the type required may be set."
},
"description": "Identifies the predefined types of actuator from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcbuildingcontrolsdomain/lexical/ifcactuatortype.htm"
},
"IfcAddress": {
"attributes": {
"Description": "Text that relates the nature of the address.",
"OfOrganization": "The inverse relationship to Organization to whom address is associated.",
"OfPerson": "The inverse relationship to Person to whom address is associated.",
"Purpose": "Identifies the logical location of the address.",
"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."
},
"description": "The inverse relationship to Organization to whom address is associated.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcaddress.htm"
},
"IfcAirTerminalBoxType": {
"attributes": {
"PredefinedType": "The air terminal box type."
},
"description": "The air terminal box type.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcairterminalboxtype.htm"
},
"IfcAirTerminalType": {
"attributes": {
"PredefinedType": ""
},
"description": "",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcairterminaltype.htm"
},
"IfcAirToAirHeatRecoveryType": {
"attributes": {
"PredefinedType": "Defines the type of air to air heat recovery device."
},
"description": "Defines the type of air to air heat recovery device.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcairtoairheatrecoverytype.htm"
},
"IfcAlarmType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of alarm from which the type required may be set."
},
"description": "Identifies the predefined types of alarm from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcbuildingcontrolsdomain/lexical/ifcalarmtype.htm"
},
"IfcAngularDimension": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcangulardimension.htm"
},
"IfcAnnotation": {
"attributes": {
"ContainedInStructure": "Relationship to a spatial structure element, to which the associate is primarily associated."
},
"description": "Relationship to a spatial structure element, to which the associate is primarily associated.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcannotation.htm"
},
"IfcAnnotationCurveOccurrence": {
"description": "Definition from ISO/CD 10303-46:1992: An annotation curve occurrence is a curve with a style assignment.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationcurveoccurrence.htm"
},
"IfcAnnotationFillArea": {
"attributes": {
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The two new attributes <i>OuterBoundary</i> and <i>InnerBoundaries</i> replace the old single attribute Boundaries. </font></small>",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The two new attributes <i>OuterBoundary</i> and <i>InnerBoundaries</i> replace the old single attribute Boundaries. </font></small>"
},
"description": "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. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The two new attributes <i>OuterBoundary</i> and <i>InnerBoundaries</i> replace the old single attribute Boundaries. </font></small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationfillarea.htm"
},
"IfcAnnotationFillAreaOccurrence": {
"attributes": {
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute has been made OPTIONAL. </font></small>",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute has been added. </font></small>"
},
"description": "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. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute has been added. </font></small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationfillareaoccurrence.htm"
},
"IfcAnnotationOccurrence": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationoccurrence.htm"
},
"IfcAnnotationSurface": {
"attributes": {
"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.",
"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_."
},
"description": "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_.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationsurface.htm"
},
"IfcAnnotationSurfaceOccurrence": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationsurfaceoccurrence.htm"
},
"IfcAnnotationSymbolOccurrence": {
"description": "Definition from ISO/CD 10303-46:1992: An annotation symbol occurrence is a symbol with a style assignment.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationsymboloccurrence.htm"
},
"IfcAnnotationTextOccurrence": {
"description": "Definition from ISO/CD 10303-46:1992: An annotation text occurrence is a text with a style assignment.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdefinitionresource/lexical/ifcannotationtextoccurrence.htm"
},
"IfcApplication": {
"attributes": {
"ApplicationDeveloper": "Name of the application developer, being requested to be member of the IAI.",
"ApplicationFullName": "The full name of the application as specified by the application developer.",
"ApplicationIdentifier": "Short identifying name for the application.",
"Version": "The version number of this software as specified by the developer of the application."
},
"description": "Short identifying name for the application.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcutilityresource/lexical/ifcapplication.htm"
},
"IfcAppliedValue": {
"attributes": {
"ApplicableDate": "The date on or from which an applied value is applicable.",
"AppliedValue": "The extent or quantity or amount of an applied value.",
"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.",
"FixedUntilDate": "The date until which applied value is applicable.",
"IsComponentIn": "The value of the single applied value which is used by the applied value relationship to express a complex applied value.",
"Name": "A name or additional clarification given to a cost (or impact) value.",
"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).",
"ValueOfComponents": "The total (or subtotal) value of the components within the applied value relationship expressed as a single applied value.",
"ValuesReferenced": "Pointer to the IfcReferencesCostDocument relationship, which refer to a document from which the cost value is referenced."
},
"description": "The value of the single applied value which is used by the applied value relationship to express a complex applied value.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccostresource/lexical/ifcappliedvalue.htm"
},
"IfcAppliedValueRelationship": {
"attributes": {
"ArithmeticOperator": "The arithmetic operator applied in an applied value relationship.",
"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."
},
"description": "A description that may apply additional information about an applied value relationship.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccostresource/lexical/ifcappliedvaluerelationship.htm"
},
"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": "The set of relationships by which other approvals are related to this one.",
"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."
},
"description": "The role of the actor w.r.t the 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": "The approval for the properties selected.",
"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": "The human readable name given to the relationship between the approvals.",
"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": "Bounded curve, defining the outer boundaries of the arbitrary profile.",
"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": "Open bounded curve defining the profile.",
"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": "Set of bounded curves, defining the inner boundaries of the arbitrary profile.",
"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": "The current value of an asset within the accounting rules and procedures of an organization.",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInY</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"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": "Location of centre of gravity along the y axis measured from the center of the bounding box. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInY</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"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": "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]))",
"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": "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)",
"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": "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)",
"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": "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)",
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcbeam.htm"
},
"IfcBeamType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of a beam element from which the type required may be set."
},
"description": "Identifies the predefined types of a beam element from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcbeamtype.htm"
},
"IfcBezierCurve": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcbeziercurve.htm"
},
"IfcBlobTexture": {
"attributes": {
"RasterCode": "Blob, given as a single binary, to capture the texture within one popular file (compression) format.",
"RasterFormat": "The format of the _RasterCode_ often using a compression."
},
"description": "Blob, given as a single binary, to capture the texture within one popular file (compression) format.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcblobtexture.htm"
},
"IfcBlock": {
"attributes": {
"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]_.",
"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]_.",
"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]_."
},
"description": "The size of the block along the placement Z axis. It is provided by the inherited axis placement through _SELF\\IfcCsgPrimitive3D.Position.P[3]_.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcblock.htm"
},
"IfcBoilerType": {
"attributes": {
"PredefinedType": "Defines types of boilers."
},
"description": "Defines types of boilers.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcboilertype.htm"
},
"IfcBooleanClippingResult": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcbooleanclippingresult.htm"
},
"IfcBooleanResult": {
"attributes": {
"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",
"FirstOperand": "The first operand to be operated upon by the Boolean operation.",
"Operator": "The Boolean operator used in the operation to create the result.",
"SecondOperand": "The second operand specified for the operation."
},
"description": "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",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcbooleanresult.htm"
},
"IfcBoundaryCondition": {
"attributes": {
"Name": "Optionally defines a name for this boundary condition."
},
"description": "Optionally defines a name for this boundary condition.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcboundarycondition.htm"
},
"IfcBoundaryEdgeCondition": {
"attributes": {
"LinearStiffnessByLengthX": "Linear stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object.",
"LinearStiffnessByLengthY": "Linear stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object.",
"LinearStiffnessByLengthZ": "Linear stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object.",
"RotationalStiffnessByLengthX": "Rotational stiffness value about the x-axis of the coordinate system defined by the instance which uses this resource object.",
"RotationalStiffnessByLengthY": "Rotational stiffness value about the y-axis of the coordinate system defined by the instance which uses this resource object.",
"RotationalStiffnessByLengthZ": "Rotational stiffness value about the z-axis of the coordinate system defined by the instance which uses this resource object."
},
"description": "Rotational stiffness value about the z-axis of the coordinate system defined by the instance which uses this resource object.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcboundaryedgecondition.htm"
},
"IfcBoundaryFaceCondition": {
"attributes": {
"LinearStiffnessByAreaX": "Linear stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object.",
"LinearStiffnessByAreaY": "Linear stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object.",
"LinearStiffnessByAreaZ": "Linear stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object."
},
"description": "Linear stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcboundaryfacecondition.htm"
},
"IfcBoundaryNodeCondition": {
"attributes": {
"LinearStiffnessX": "Linear stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object.",
"LinearStiffnessY": "Linear stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object.",
"LinearStiffnessZ": "Linear stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object.",
"RotationalStiffnessX": "Rotational stiffness value about the x-axis of the coordinate system defined by the instance which uses this resource object.",
"RotationalStiffnessY": "Rotational stiffness value about the y-axis of the coordinate system defined by the instance which uses this resource object.",
"RotationalStiffnessZ": "Rotational stiffness value about the z-axis of the coordinate system defined by the instance which uses this resource object."
},
"description": "Rotational stiffness value about the z-axis of the coordinate system defined by the instance which uses this resource object.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcboundarynodecondition.htm"
},
"IfcBoundaryNodeConditionWarping": {
"attributes": {
"WarpingStiffness": "Defines the warping stiffness value."
},
"description": "Defines the warping stiffness value.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcboundarynodeconditionwarping.htm"
},
"IfcBoundedCurve": {
"description": "Definition from ISO/CD 10303-42:1992: A bounded curve is a curve of finite arc length with identifiable end points.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcboundedcurve.htm"
},
"IfcBoundedSurface": {
"description": "Definition from ISO/CD 10303-42:1992: A bounded surface is a surface of finite area with identifiable boundaries.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcboundedsurface.htm"
},
"IfcBoundingBox": {
"attributes": {
"Corner": "Location of the bottom left corner (having the minimum values).",
"Dim": "The space dimensionality of this class, it is always 3. 3",
"XDim": "Length attribute (measured along the edge parallel to the X Axis)",
"YDim": "Width attribute (measured along the edge parallel to the Y Axis)",
"ZDim": "Height attribute (measured along the edge parallel to the Z Axis)."
},
"description": "The space dimensionality of this class, it is always 3. 3",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcboundingbox.htm"
},
"IfcBoxedHalfSpace": {
"attributes": {
"Enclosure": "The box which bounds the half space for computational purposes only."
},
"description": "The box which bounds the half space for computational purposes only.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcboxedhalfspace.htm"
},
"IfcBuilding": {
"attributes": {
"BuildingAddress": "Address given to the building for postal purposes.",
"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.",
"ElevationOfTerrain": "Elevation above the minimal terrain level around the foot print of the building, given in elevation above sea level."
},
"description": "Address given to the building for postal purposes.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcbuilding.htm"
},
"IfcBuildingElement": {
"description": "Definition from ISO 6707-1:1989: Major functional part of a building, examples are foundation, floor, roof, wall.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcbuildingelement.htm"
},
"IfcBuildingElementComponent": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifcbuildingelementcomponent.htm"
},
"IfcBuildingElementPart": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifcbuildingelementpart.htm"
},
"IfcBuildingElementProxy": {
"attributes": {
"CompositionType": "Indication, whether the proxy is intended to form an aggregation (COMPLEX), an integral element (ELEMENT), or a part in an aggregation (PARTIAL)."
},
"description": "Indication, whether the proxy is intended to form an aggregation (COMPLEX), an integral element (ELEMENT), or a part in an aggregation (PARTIAL).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcbuildingelementproxy.htm"
},
"IfcBuildingElementProxyType": {
"attributes": {
"PredefinedType": "Predefined types to define the particular type of an building element proxy. There may be property set definitions available for each predefined or user defined type."
},
"description": "Predefined types to define the particular type of an building element proxy. There may be property set definitions available for each predefined or user defined type.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcbuildingelementproxytype.htm"
},
"IfcBuildingElementType": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcbuildingelementtype.htm"
},
"IfcBuildingStorey": {
"attributes": {
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcbuildingstorey.htm"
},
"IfcCShapeProfileDef": {
"attributes": {
"CentreOfGravityInX": "Location of centre of gravity along the x axis measured from the center of the bounding box. > <small><color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInX</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </color=\"#ff0000\"></small>",
"Depth": "Profile depth, see illustration above (= h).",
"Girth": "Lengths of girth, see illustration above (= c).",
"InternalFilletRadius": "Internal fillet radius according the above illustration (= r1). If it is not given, zero is assumed.",
"WallThickness": "Constant wall thickness of profile (= ts).",
"Width": "Profile width, see illustration above (= b)."
},
"description": "Location of centre of gravity along the x axis measured from the center of the bounding box. > <small><color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInX</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </color=\"#ff0000\"></small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifccshapeprofiledef.htm"
},
"IfcCableCarrierFittingType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of cable carrier fitting from which the type required may be set."
},
"description": "Identifies the predefined types of cable carrier fitting from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifccablecarrierfittingtype.htm"
},
"IfcCableCarrierSegmentType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of cable carrier segment from which the type required may be set."
},
"description": "Identifies the predefined types of cable carrier segment from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifccablecarriersegmenttype.htm"
},
"IfcCableSegmentType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of cable segment from which the type required may be set."
},
"description": "Identifies the predefined types of cable segment from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifccablesegmenttype.htm"
},
"IfcCalendarDate": {
"attributes": {
"DayComponent": "The day element of the calendar date.",
"MonthComponent": "The month element of the calendar date.",
"YearComponent": "The year element of the calendar date."
},
"description": "The year element of the calendar date.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcdatetimeresource/lexical/ifccalendardate.htm"
},
"IfcCartesianPoint": {
"attributes": {
"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.",
"Dim": "The space dimensionality of this class, determined by the number of coordinates in the List of Coordinates. HIINDEX(Coordinates)"
},
"description": "The space dimensionality of this class, determined by the number of coordinates in the List of Coordinates. HIINDEX(Coordinates)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccartesianpoint.htm"
},
"IfcCartesianTransformationOperator": {
"attributes": {
"Axis1": "The direction used to determine U[1], the derived X axis direction.",
"Axis2": "The direction used to determine U[2], the derived Y axis direction.",
"Dim": "The space dimensionality of this class, determined by the space dimensionality of the local origin. LocalOrigin.Dim",
"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.",
"Scale": "The scaling value specified for the transformation.",
"Scl": "The derived scale S of the transformation, equal to scale if that exists, or 1.0 otherwise. NVL(Scale, 1.0)"
},
"description": "The space dimensionality of this class, determined by the space dimensionality of the local origin. LocalOrigin.Dim",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccartesiantransformationoperator.htm"
},
"IfcCartesianTransformationOperator2D": {
"attributes": {
"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,?)"
},
"description": "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,?)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccartesiantransformationoperator2d.htm"
},
"IfcCartesianTransformationOperator2DnonUniform": {
"attributes": {
"Scale2": "The scaling value specified for the transformation along the axis 2. This is normally the y scale factor.",
"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)"
},
"description": "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)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccartesiantransformationoperator2dnonuniform.htm"
},
"IfcCartesianTransformationOperator3D": {
"attributes": {
"Axis3": "The exact direction of U[3], the derived Z axis direction.",
"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)"
},
"description": "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)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccartesiantransformationoperator3d.htm"
},
"IfcCartesianTransformationOperator3DnonUniform": {
"attributes": {
"Scale2": "The scaling value specified for the transformation along the axis 2. This is normally the y scale factor.",
"Scale3": "The scaling value specified for the transformation along the axis 3. This is normally the z scale factor.",
"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)",
"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)"
},
"description": "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)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccartesiantransformationoperator3dnonuniform.htm"
},
"IfcCenterLineProfileDef": {
"attributes": {
"Thickness": "Constant thickness applied along the center line."
},
"description": "Constant thickness applied along the center line.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifccenterlineprofiledef.htm"
},
"IfcChamferEdgeFeature": {
"attributes": {
"Height": "The height of the feature chamfer cross section.",
"Width": "The width of the feature chamfer cross section."
},
"description": "The height of the feature chamfer cross section.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcchamferedgefeature.htm"
},
"IfcChillerType": {
"attributes": {
"PredefinedType": "Defines the typical types of chillers (e.g., air-cooled, water-cooled, etc.)."
},
"description": "Defines the typical types of chillers (e.g., air-cooled, water-cooled, etc.).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcchillertype.htm"
},
"IfcCircle": {
"attributes": {
"Radius": "The radius of the circle, which shall be greater than zero."
},
"description": "The radius of the circle, which shall be greater than zero.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccircle.htm"
},
"IfcCircleHollowProfileDef": {
"attributes": {
"WallThickness": "Thickness of the material, it is the difference between the outer and inner radius."
},
"description": "Thickness of the material, it is the difference between the outer and inner radius.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifccirclehollowprofiledef.htm"
},
"IfcCircleProfileDef": {
"attributes": {
"Radius": "The radius of the circle."
},
"description": "The radius of the circle.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifccircleprofiledef.htm"
},
"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": "Classification items that are classified by the classification.",
"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.",
"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\"."
},
"description": "Identifies the relationship in which the role of ClassifyingItem is taken.",
"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": "The child level items in a classification structure that are related to the parent level item.",
"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": "Alphanumeric characters in defined groups from which the classification notation is derived.",
"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": "The notation value that specifies the classification e.g. 'L781'",
"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": "The classification system or source that is referenced.",
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcclosedshell.htm"
},
"IfcCoilType": {
"attributes": {
"PredefinedType": "Defines typical types of coils (e.g., Cooling, Heating, etc.)"
},
"description": "Defines typical types of coils (e.g., Cooling, Heating, etc.)",
"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. > <small> NOTE&npsp; The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual. </small>",
"Green": "The intensity of the green colour component. > <small> NOTE&npsp; The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual. </small>",
"Red": "The intensity of the red colour component. > <small> NOTE&npsp; The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual. </small>"
},
"description": "The intensity of the blue colour component. > <small> NOTE&npsp; The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual. </small>",
"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). > <small> NOTE&nbsp; Examples are the names of a industry colour classification, such as RAL.<br> <font color=\"#FF0000\">IFC2x Edition 3 CHANGE&nbsp; Attribute added. </font></small>"
},
"description": "Optional name given to a particular colour specification in addition to the colour components (like the RGB values). > <small> NOTE&nbsp; Examples are the names of a industry colour classification, such as RAL.<br> <font color=\"#FF0000\">IFC2x Edition 3 CHANGE&nbsp; Attribute added. </font></small>",
"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": {
"attributes": {
"PredefinedType": "Identifies the predefined types of a column element from which the type required may be set."
},
"description": "Identifies the predefined types of a column element from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifccolumntype.htm"
},
"IfcComplexProperty": {
"attributes": {
"HasProperties": "Set of properties that can be used within this complex property (may include other complex properties).",
"UsageName": "Usage description of the _IfcComplexProperty_ within the property set which references the _IfcComplexProperty_. > <font size=\"-1\">NOTE: Consider a complex property for glazing properties. The <i>Name</i> attribute of the <i>IfcComplexProperty</i> could be <i>Pset_GlazingProperties</i>, and the UsageName attribute could be <i>OuterGlazingPane</i>.</font>"
},
"description": "Set of properties that can be used within this complex property (may include other complex properties).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifccomplexproperty.htm"
},
"IfcCompositeCurve": {
"attributes": {
"ClosedCurve": "Indication whether the curve is closed or not; this is derived from the transition code of the last segment. Segments[NSegments].Transition <> Discontinuous",
"NSegments": "The number of component curves. SIZEOF(Segments)",
"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.",
"SelfIntersect": "Indication of whether the curve intersects itself or not; this is for information only."
},
"description": "Indication whether the curve is closed or not; this is derived from the transition code of the last segment. Segments[NSegments].Transition <> Discontinuous",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccompositecurve.htm"
},
"IfcCompositeCurveSegment": {
"attributes": {
"Dim": "The space dimensionality of this class, defined by the dimensionality of the first ParentCurve. ParentCurve.Dim",
"ParentCurve": "The bounded curve which defines the geometry of the segment.",
"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.",
"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.",
"UsingCurves": "The set of composite curves which use this composite curve segment as a segment. This set shall not be empty."
},
"description": "The set of composite curves which use this composite curve segment as a segment. This set shall not be empty.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifccompositecurvesegment.htm"
},
"IfcCompositeProfileDef": {
"attributes": {
"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.",
"Profiles": "The profiles which are used to define the composite profile."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifccompositeprofiledef.htm"
},
"IfcCompressorType": {
"attributes": {
"PredefinedType": "Defines the type of compressor (e.g., hermetic, reciprocating, etc.)."
},
"description": "Defines the type of compressor (e.g., hermetic, reciprocating, etc.).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifccompressortype.htm"
},
"IfcCondenserType": {
"attributes": {
"PredefinedType": "Defines the type of condenser."
},
"description": "Defines the type of condenser.",
"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",
"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": "The time and/or date at which the criterion is determined.",
"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": "The location and orientation of the conic. Further details of the interpretation of this attribute are given for the individual subtypes.\"",
"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": "The set of faces arcwise connected along common edges or vertices.",
"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 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.",
"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.",
"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": "Distance in z direction between the two points (or vertex points) engaged in the point connection.",
"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": "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.",
"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": "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.",
"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": "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.",
"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": "Reference to the relationships that relate this constraint into aggregate constraints.",
"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": "Enumeration that identifies the logical type of aggregation.",
"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": "Classifications of the constraint.",
"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": "Constraints that are related with the RelatingConstraint.",
"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": "The ratio of the amount of a construction material used to the amount provided (determined as a quantity)",
"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.",
"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": "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.",
"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": "The word, or group of words, by which the context dependent unit is referred to.",
"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": "Reference to the relationship that associates the control to the object(s) being controlled.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifccontrol.htm"
},
"IfcControllerType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of controller from which the type required may be set."
},
"description": "Identifies the predefined types of controller from which the type required may be set.",
"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": "The physical quantity from which the converted unit is derived.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcconversionbasedunit.htm"
},
"IfcCooledBeamType": {
"attributes": {
"PredefinedType": "Defines the type of cooled beam."
},
"description": "Defines the type of cooled beam.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifccooledbeamtype.htm"
},
"IfcCoolingTowerType": {
"attributes": {
"PredefinedType": "Defines the typical types of cooling towers (e.g., OpenTower, ClosedTower, CrossFlow, etc.)."
},
"description": "Defines the typical types of cooling towers (e.g., OpenTower, ClosedTower, CrossFlow, etc.).",
"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. > <font size=\"-1\">Note: The data type of the Sense is an enumeration - AHEAD means positive offset; BEHIND means negative offset. </font>"
},
"description": "The direction of the offset. > <font size=\"-1\">Note: The data type of the Sense is an enumeration - AHEAD means positive offset; BEHIND means negative offset. </font>",
"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.",
"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.",
"PredefinedType": "Predefined types of cost schedule from which that required may be selected.",
"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": "Predefined types of cost schedule from which that required may be selected.",
"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": "The condition under which a cost value applies.",
"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": "",
"PredefinedType": "Predefined types to define the particular type of the covering. There may be property set definitions available for each predefined type."
},
"description": "Reference to the objectified relationship that handles the relationship of the covering to the covered space.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifccovering.htm"
},
"IfcCoveringType": {
"attributes": {
"PredefinedType": "Predefined types to define the particular type of the covering. There may be property set definitions available for each predefined type."
},
"description": "Predefined types to define the particular type of the covering. There may be property set definitions available for each predefined type.",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInY</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"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": "Location of centre of gravity along the y axis measured from the center of the bounding box. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInY</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInY</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"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": "Location of centre of gravity along the y axis measured from the center of the bounding box. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInY</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"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.",
"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": "The space dimensionality of this geometric representation item, it is always 3. 3",
"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": "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).",
"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": "The source from which an exchange rate is obtained.",
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifccurtainwall.htm"
},
"IfcCurtainWallType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of a curtain wall element from which the type required may be set."
},
"description": "Identifies the predefined types of a curtain wall element from which the type required may be set.",
"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": "The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve. IfcCurveDim(SELF)",
"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": "The space dimensionality of this class, defined by the dimensionality of the basis surface. BasisSurface.Dim",
"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": "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.",
"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": "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.",
"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": "The scale factor.",
"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. > <small> NOTE&nbsp; For a visible segment representing a point, the value 0. should be assigned.<br> <font color=\"#FF0000\"> IFC2x Edition 3 CHANGE&nbsp; The datatype has been changed to IfcLengthMeasure with upward compatibility for file-based exchange. </font></small>"
},
"description": "The length of the invisible segment in the pattern definition.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifccurvestylefontpattern.htm"
},
"IfcDamperType": {
"attributes": {
"PredefinedType": "Type of damper."
},
"description": "Type of 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": "The time element of the date time combination.",
"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 description of the placement, orientation and (uniform or non-uniform) scaling of the 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": "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.",
"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": "Dimensional exponents derived using the function IfcDerivedDimensionalExponents using (SELF) as the input value. IfcDeriveDimensionalExponents(Elements)",
"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": "The power that is applied to the unit attribute.",
"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).",
"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"
},
"IfcDimensionCurve": {
"attributes": {
"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."
},
"description": "Reference to the terminator symbols that may be assigned to the dimension curve. There shall be either zero, one or two terminator symbols assigned.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdimensioncurve.htm"
},
"IfcDimensionCurveDirectedCallout": {
"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:",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdimensioncurvedirectedcallout.htm"
},
"IfcDimensionCurveTerminator": {
"attributes": {
"Role": "Role of the dimension curve terminator within a dimension curve (being either an origin or target)."
},
"description": "Role of the dimension curve terminator within a dimension curve (being either an origin or target).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdimensioncurveterminator.htm"
},
"IfcDimensionPair": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdimensionpair.htm"
},
"IfcDimensionalExponents": {
"attributes": {
"AmountOfSubstanceExponent": "The power of the amount of substance base quantity.",
"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.",
"ThermodynamicTemperatureExponent": "The power of the thermodynamic temperature base quantity.",
"TimeExponent": "The power of the time base quantity."
},
"description": "The power of the luminous intensity base quantity.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcdimensionalexponents.htm"
},
"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])"
},
"description": "The space dimensionality of this class, defined by the number of real in the list of DirectionRatios. HIINDEX(DirectionRatios)",
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcdiscreteaccessory.htm"
},
"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).",
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcdistributionchamberelement.htm"
},
"IfcDistributionChamberElementType": {
"attributes": {
"PredefinedType": "Predefined types of distribution chambers."
},
"description": "Predefined types of distribution chambers.",
"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": "Reference through the relationship object to related distribution flow elements.",
"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).",
"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):",
"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).",
"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": "Reference to the relationship object that relates control elements.",
"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).",
"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": "Enumeration that identifies if this port is a Sink (inlet), a Source (outlet) or both a SinkAndSource.",
"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": "Mime subtype information.",
"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 inverse relationship from the IfcDocumentInformationRelationship to the relating document.",
"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.",
"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."
},
"description": "Describes the type of relationship between documents. This could be sub-document, replacement etc. The interpretation has to be established in an application context.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcdocumentinformationrelationship.htm"
},
"IfcDocumentReference": {
"attributes": {
"ReferenceToDocument": "The document information that is being referenced."
},
"description": "The document information that is being referenced.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcexternalreferenceresource/lexical/ifcdocumentreference.htm"
},
"IfcDoor": {
"attributes": {
"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. > <small> NOTE&nbsp; 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 <i>OverallHeight</i> shall still be given as the door opening height, and not as the total height of the door lining.</small>",
"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. > <small> NOTE&nbsp; 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 <i>OverallWidth</i> shall still be given as the door opening width, and not as the total width of the door lining.</small>"
},
"description": "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. > <small> NOTE&nbsp; 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 <i>OverallWidth</i> shall still be given as the door opening width, and not as the total width of the door lining.</small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcdoor.htm"
},
"IfcDoorLiningProperties": {
"attributes": {
"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.",
"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.",
"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).",
"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.",
"LiningThickness": "Thickness (width in plane parallel to door leaf) of the door lining.",
"ShapeAspectStyle": "Pointer to the shape aspect, if given. The shape aspect reflects the part of the door shape, which represents the door lining.",
"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).",
"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.",
"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.",
"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.",
"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."
},
"description": "Pointer to the shape aspect, if given. The shape aspect reflects the part of the door shape, which represents the door lining.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcdoorliningproperties.htm"
},
"IfcDoorPanelProperties": {
"attributes": {
"PanelDepth": "Depth of the door panel, measured perpendicular to the plane of the door leaf.",
"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.",
"PanelPosition": "Position of this panel within the door.",
"PanelWidth": "Width of this panel, given as ratio relative to the total clear opening width of the door.",
"ShapeAspectStyle": "Pointer to the shape aspect, if given. The shape aspect reflects the part of the door shape, which represents the door panel."
},
"description": "Pointer to the shape aspect, if given. The shape aspect reflects the part of the door shape, which represents the door panel.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcdoorpanelproperties.htm"
},
"IfcDoorStyle": {
"attributes": {
"ConstructionType": "Type defining the basic construction and material type of the door.",
"OperationType": "Type defining the general layout and operation of the door style.",
"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.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcdoorstyle.htm"
},
"IfcDraughtingCallout": {
"attributes": {
"Contents": "The annotation curves, symbols, or text comprising the presentation of information.",
"IsRelatedFromCallout": "",
"IsRelatedToCallout": ""
},
"description": "",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdraughtingcallout.htm"
},
"IfcDraughtingCalloutRelationship": {
"attributes": {
"Description": "Additional informal description of the relationship.",
"Name": "The word or group of words by which the relationship is referred to.",
"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."
},
"description": "The other of the draughting callouts which is a part of the relationship.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcdraughtingcalloutrelationship.htm"
},
"IfcDraughtingPreDefinedColour": {
"description": "The draughting pre defined colour is a pre defined colour for the purpose to identify a colour by name. Allowable names are:",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifcdraughtingpredefinedcolour.htm"
},
"IfcDraughtingPreDefinedCurveFont": {
"description": "The draughting predefined curve font type defines a selection of widely used curve fonts for draughting purposes by name.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcdraughtingpredefinedcurvefont.htm"
},
"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:",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifcdraughtingpredefinedtextfont.htm"
},
"IfcDuctFittingType": {
"attributes": {
"PredefinedType": "The type of duct fitting."
},
"description": "The type of duct fitting.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcductfittingtype.htm"
},
"IfcDuctSegmentType": {
"attributes": {
"PredefinedType": "The type of duct segment."
},
"description": "The type of duct segment.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcductsegmenttype.htm"
},
"IfcDuctSilencerType": {
"attributes": {
"PredefinedType": "The type of duct silencer."
},
"description": "The type of duct silencer.",
"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": "End point (vertex) of the edge. The same vertex can be used for both EdgeStart and EdgeEnd.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcedge.htm"
},
"IfcEdgeCurve": {
"attributes": {
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcedgecurve.htm"
},
"IfcEdgeFeature": {
"attributes": {
"FeatureLength": "The length of the feature in orthogonal direction from the feature cross section."
},
"description": "The length of the feature in orthogonal direction from the feature cross section.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcedgefeature.htm"
},
"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": "The number of elements in the edge list. SIZEOF(EdgeList)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcedgeloop.htm"
},
"IfcElectricApplianceType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of electrical appliance from which the type required may be set."
},
"description": "Identifies the predefined types of electrical appliance from which the type required may be set.",
"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": "",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectricdistributionpoint.htm"
},
"IfcElectricFlowStorageDeviceType": {
"attributes": {
"PredefinedType": ""
},
"description": "",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectricflowstoragedevicetype.htm"
},
"IfcElectricGeneratorType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of electric generators from which the type required may be set."
},
"description": "Identifies the predefined types of electric generators from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectricgeneratortype.htm"
},
"IfcElectricHeaterType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of electric heater from which the type required may be set."
},
"description": "Identifies the predefined types of electric heater from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectricheatertype.htm"
},
"IfcElectricMotorType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of electric motor from which the type required may be set."
},
"description": "Identifies the predefined types of electric motor from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcelectricmotortype.htm"
},
"IfcElectricTimeControlType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of electrical time control from which the type required may be set."
},
"description": "Identifies the predefined types of electrical time control from which the type required may be set.",
"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": "Relative phase of input conductors",
"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.",
"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. > <font color=\"#ff0000\"><small> IFC2x Edition 3 CHANGE&nbsp; The inverse attribute has been added with upward compatibility for file based exchange. <small></small></small></font>",
"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": "Containment relationship to the spatial structure element, to which the element is primarily associated.",
"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.",
"PredefinedType": "Predefined generic types for a element assembly that are specified in an enumeration."
},
"description": "Predefined generic types for a element assembly that are specified in an enumeration.",
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcelementcomponent.htm"
},
"IfcElementComponentType": {
"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": {
"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. > <font color=\"#FF0000\" size=\"-1\">IFC2x2 Addendum 1 change: The attribute has been changed to be optional </font>",
"Quantities": "The individual quantities for the element, can be a set of length, area, volume, weight or count based quantities."
},
"description": "The individual quantities for the element, can be a set of length, area, volume, weight or count based quantities.",
"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 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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcelementtype.htm"
},
"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": "The space dimensionality of this class, derived from the dimensionality of the Position. Position.Dim",
"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": "The second radius of the ellipse which shall be positive.",
"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": "The second radius of the ellipse. It is measured along the direction of Position.P[2].",
"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.",
"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).",
"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": "This attribute must be defined if the EnergySequence is USERDEFINED.",
"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": "A user defined value category into which the environmental impact value falls.",
"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.",
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcequipmentstandard.htm"
},
"IfcEvaporativeCoolerType": {
"attributes": {
"PredefinedType": "Defines the type of evaporative cooler."
},
"description": "Defines the type of evaporative cooler.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcevaporativecoolertype.htm"
},
"IfcEvaporatorType": {
"attributes": {
"PredefinedType": "Defines the type of evaporator."
},
"description": "Defines the type of evaporator.",
"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": "The name given to the set of extended properties.",
"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": "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).",
"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 distance the surface is to be swept.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcextrudedareasolid.htm"
},
"IfcFace": {
"attributes": {
"Bounds": "Boundaries of the face."
},
"description": "Boundaries of the face.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcface.htm"
},
"IfcFaceBasedSurfaceModel": {
"attributes": {
"Dim": "The space dimensionality of this class, it is always 3. 3",
"FbsmFaces": "The set of connected face sets comprising the face based surface model."
},
"description": "The space dimensionality of this class, it is always 3. 3",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcfacebasedsurfacemodel.htm"
},
"IfcFaceBound": {
"attributes": {
"Bound": "The loop which will be used as a face boundary.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcfacebound.htm"
},
"IfcFaceOuterBound": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcfaceouterbound.htm"
},
"IfcFaceSurface": {
"attributes": {
"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.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcfacesurface.htm"
},
"IfcFacetedBrep": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcfacetedbrep.htm"
},
"IfcFacetedBrepWithVoids": {
"attributes": {
"Voids": "Set of closed shells defining voids within the solid."
},
"description": "Set of closed shells defining voids within the solid.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcfacetedbrepwithvoids.htm"
},
"IfcFailureConnectionCondition": {
"attributes": {
"CompressionFailureX": "Compression force in x-direction leading to failure of the connection.",
"CompressionFailureY": "Compression force in y-direction leading to failure of the connection.",
"CompressionFailureZ": "Compression force in z-direction leading to failure of the connection.",
"TensionFailureX": "Tension force in x-direction leading to failure of the connection.",
"TensionFailureY": "Tension force in y-direction leading to failure of the connection.",
"TensionFailureZ": "Tension force in z-direction leading to failure of the connection."
},
"description": "Compression force in z-direction leading to failure of the connection.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcfailureconnectioncondition.htm"
},
"IfcFanType": {
"attributes": {
"PredefinedType": "Defines the type of fan typically used in building services."
},
"description": "Defines the type of fan typically used in building services.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcfantype.htm"
},
"IfcFastener": {
"description": "Representations of fixing parts which are used as fasteners to connect or join elements with other elements.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcfastener.htm"
},
"IfcFastenerType": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedcomponentelements/lexical/ifcfastenertype.htm"
},
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcfeatureelement.htm"
},
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcfeatureelementaddition.htm"
},
"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": "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.",
"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": "The set of fill area styles to use in presenting visible curve segments, annotation fill areas or surfaces.",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>PatternStart</i> has been made OPTIONAL.</font></small>",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The usage of the attribute <i>PointOfReferenceHatchLine</i> has changed to not provide the Cartesian point which is the origin for mapping, but to provide an offset to the origin for the mapping. The attribute has been made OPTIONAL. </font></small>",
"StartOfNextHatchLine": "A repetition factor that determines the distance between adjacent hatch lines. > <small><color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute type of <i>StartOfNextHatchLine</i> has changed to a SELECT of <i>IfcPositiveLengthMeasure</i> (new) and <i>IfcOneDirectionRepeatFactor</i>.</color=\"#ff0000\"></small>"
},
"description": "A plane angle measure determining the direction of the parallel hatching lines.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcfillareastylehatching.htm"
},
"IfcFillAreaStyleTileSymbolWithStyle": {
"attributes": {
"Symbol": "A styled annotation symbol."
},
"description": "A styled annotation symbol.",
"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": "The scale factor applied to each tile as it is placed in the annotation fill area.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcfillareastyletiles.htm"
},
"IfcFilterType": {
"attributes": {
"PredefinedType": "The type of air filter."
},
"description": "The type of air filter.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcfiltertype.htm"
},
"IfcFireSuppressionTerminalType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of fire suppression terminal from which the type required may be set."
},
"description": "Identifies the predefined types of fire suppression terminal from which the type required may be set.",
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowcontroller.htm"
},
"IfcFlowControllerType": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowcontrollertype.htm"
},
"IfcFlowFitting": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowfitting.htm"
},
"IfcFlowFittingType": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowfittingtype.htm"
},
"IfcFlowInstrumentType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of flow instrument from which the type required may be set."
},
"description": "Identifies the predefined types of flow instrument from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcbuildingcontrolsdomain/lexical/ifcflowinstrumenttype.htm"
},
"IfcFlowMeterType": {
"attributes": {
"PredefinedType": "Defines the type of flow meter."
},
"description": "Defines the type of flow meter.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcflowmetertype.htm"
},
"IfcFlowMovingDevice": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowmovingdevice.htm"
},
"IfcFlowMovingDeviceType": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowmovingdevicetype.htm"
},
"IfcFlowSegment": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowsegment.htm"
},
"IfcFlowSegmentType": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowsegmenttype.htm"
},
"IfcFlowStorageDevice": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowstoragedevice.htm"
},
"IfcFlowStorageDeviceType": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowstoragedevicetype.htm"
},
"IfcFlowTerminal": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowterminal.htm"
},
"IfcFlowTerminalType": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowterminaltype.htm"
},
"IfcFlowTreatmentDevice": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowtreatmentdevice.htm"
},
"IfcFlowTreatmentDeviceType": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcflowtreatmentdevicetype.htm"
},
"IfcFluidFlowProperties": {
"attributes": {
"FlowConditionSingleValue": "Defines the flow condition as a percentage of the cross-sectional area.",
"FlowConditionTimeSeries": "A times series defining the flow condition as a percentage of the cross-sectional area.",
"FlowrateSingleValue": "The flow rate of the fluid. Either a mass or volumetric flow rate shall be defined.",
"FlowrateTimeSeries": "A time series of flow rate values. Note that either volumetric or mass flow rate values should be specified.",
"Fluid": "The properties of the fluid.",
"PressureSingleValue": "The pressure of the fluid.",
"PressureTimeSeries": "A time series of pressure values of the fluid.",
"PropertySource": "The source of the fluid flow properties (e.g., are these design values, measured values, etc.).",
"TemperatureSingleValue": "Temperature of the fluid. For air this value represents the dry bulb temperature.",
"TemperatureTimeSeries": "Time series of fluid temperature values. For air, these values represent the dry bulb temperature.",
"UserDefinedPropertySource": "This attribute must be defined if the PropertySource is USERDEFINED.",
"VelocitySingleValue": "The velocity of the fluid.",
"VelocityTimeSeries": "A time series of velocity values of the fluid.",
"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."
},
"description": "The pressure of the fluid.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcfluidflowproperties.htm"
},
"IfcFooting": {
"attributes": {
"PredefinedType": "The generic type of the footing."
},
"description": "The generic type of the footing.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifcfooting.htm"
},
"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.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcfuelproperties.htm"
},
"IfcFurnishingElement": {
"description": "Generalization of all furniture related objects. Furnishing objects are characterized as being",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcfurnishingelement.htm"
},
"IfcFurnishingElementType": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcfurnishingelementtype.htm"
},
"IfcFurnitureStandard": {
"description": "An IfcFurnitureStandard is a standard for furniture allocation that can be assigned to persons within an organization.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcfurniturestandard.htm"
},
"IfcFurnitureType": {
"attributes": {
"AssemblyPlace": "A designation of where the assembly is intended to take place defined by an Enum."
},
"description": "A designation of where the assembly is intended to take place defined by an Enum.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedfacilitieselements/lexical/ifcfurnituretype.htm"
},
"IfcGasTerminalType": {
"attributes": {
"PredefinedType": ""
},
"description": "",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcgasterminaltype.htm"
},
"IfcGeneralMaterialProperties": {
"attributes": {
"MassDensity": "Material mass density, usually measured in [kg/m3].",
"MolecularWeight": "Molecular weight of material (typically gas), measured in g/mole.",
"Porosity": "The void fraction of the total volume occupied by material (Vbr - Vnet)/Vbr [m3/m3]."
},
"description": "Material mass density, usually measured in [kg/m3].",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcgeneralmaterialproperties.htm"
},
"IfcGeneralProfileProperties": {
"attributes": {
"CrossSectionArea": "Cross sectional area of profile. Usually measured in [mm2].",
"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].",
"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].",
"Perimeter": "Perimeter of the profile for calculating the surface area. Usually measured in [mm].",
"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]."
},
"description": "Cross sectional area of profile. Usually measured in [mm2].",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofilepropertyresource/lexical/ifcgeneralprofileproperties.htm"
},
"IfcGeometricCurveSet": {
"description": "Definition from ISO/CD 10303-42:1992: A geometric curve set is a collection of two or three dimensional points and curves.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcgeometriccurveset.htm"
},
"IfcGeometricRepresentationContext": {
"attributes": {
"CoordinateSpaceDimension": "The integer dimension count of the coordinate space modeled in a geometric representation context.",
"HasSubContexts": "The set of _IfcGeometricRepresentationSubContexts_ that refer to this _IfcGeometricRepresentationContext_. > <small> <font color=\"#FF0000\">IFC2x Edition 3 CHANGE&nbsp; New inverse attribute.</font> </small>",
"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.",
"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_.",
"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. > <small> Note&nbsp; 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.). </small>"
},
"description": "The set of _IfcGeometricRepresentationSubContexts_ that refer to this _IfcGeometricRepresentationContext_. > <small> <font color=\"#FF0000\">IFC2x Edition 3 CHANGE&nbsp; New inverse attribute.</font> </small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcgeometricrepresentationcontext.htm"
},
"IfcGeometricRepresentationItem": {
"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:",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcgeometricrepresentationitem.htm"
},
"IfcGeometricRepresentationSubContext": {
"attributes": {
"CoordinateSpaceDimension": "ParentContext.CoordinateSpaceDimension",
"ParentContext": "Parent context from which the sub context derives its world coordinate system, precision, space coordinate dimension and true north.",
"Precision": "NVL(ParentContext.Precision,1.E-5)",
"TargetScale": "The target <font color=\"#ff0000\">plot</font> scale of the representation to which this representation context applies. > <font size=\"-1\"> 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.<br> If multiple instances of <i>IfcGeometricRepresentationSubContext</i> are given having the same <i>TargetView</i> value, the target plot scale applies up to the next smaller scale, or up to unlimited small scale. <br> <br> Note: Scale 1:100 (given as 0.01 within <i>TargetScale</i>) is bigger then 1:200 (given as 0.005 within <i>TargetScale</i>). </font>",
"TargetView": "Target view of the representation to which this representation context applies.",
"TrueNorth": "NVL(ParentContext.TrueNorth,SELF.WorldCoordinateSystem.P[2])",
"UserDefinedTargetView": "User defined target view, this attribute value shall be given, if the TargetView attribute is set to USERDEFINED.",
"WorldCoordinateSystem": "ParentContext.WorldCoordinateSystem"
},
"description": "NVL(ParentContext.Precision,1.E-5)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcgeometricrepresentationsubcontext.htm"
},
"IfcGeometricSet": {
"attributes": {
"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",
"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."
},
"description": "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",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcgeometricset.htm"
},
"IfcGrid": {
"attributes": {
"ContainedInStructure": "Relationship to a spatial structure element, to which the grid is primarily associated. > <small><font color=\"#FF0000\">IFC2x PLATFORM CHANGE&nbsp; The inverse relationship has been added to <i>IfcGrid</i> with upward compatibility</font> </small>",
"UAxes": "List of grid axes defining the first row of grid lines.",
"VAxes": "List of grid axes defining the second row of grid lines.",
"WAxes": "List of grid axes defining the third row of grid lines. It may be given in the case of a triangular grid."
},
"description": "Relationship to a spatial structure element, to which the grid is primarily associated. > <small><font color=\"#FF0000\">IFC2x PLATFORM CHANGE&nbsp; The inverse relationship has been added to <i>IfcGrid</i> with upward compatibility</font> </small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcgrid.htm"
},
"IfcGridAxis": {
"attributes": {
"AxisCurve": "Underlying curve which provides the geometry for this grid axis.",
"AxisTag": "The tag or name for this grid axis.",
"HasIntersections": "The reference to a set of <IfcVirtualGridIntersection's, that connect other grid axes to this grid axis. > <small> <font color=\"#FF0000\">IFC2x3 CHANGE&nbsp; New inverse attribute.</font> </small>",
"PartOfU": "If provided, the _IfcGridAxis_ is part of the _UAxes_ of _IfcGrid_. > <small> <font color=\"#FF0000\">IFC2x Edition 3 CHANGE&nbsp; New inverse attribute.</font> </small>",
"PartOfV": "If provided, the _IfcGridAxis_ is part of the _VAxes_ of _IfcGrid_. > <small> <font color=\"#FF0000\">IFC2x Edition 3 CHANGE&nbsp; New inverse attribute.</font> </small>",
"PartOfW": "If provided, the _IfcGridAxis_ is part of the _WAxes_ of _IfcGrid_. > <small> <font color=\"#FF0000\">IFC2x Edition 3 CHANGE&nbsp; New inverse attribute.</font> </small>",
"SameSense": "Defines whether the original sense of curve is used or whether it is reversed in the context of the grid axis."
},
"description": "The reference to a set of <IfcVirtualGridIntersection's, that connect other grid axes to this grid axis. > <small> <font color=\"#FF0000\">IFC2x3 CHANGE&nbsp; New inverse attribute.</font> </small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcgridaxis.htm"
},
"IfcGridPlacement": {
"attributes": {
"PlacementLocation": "A constraint on one or both ends of the path for an ExtrudedSolid.",
"PlacementRefDirection": "Reference to a second grid axis intersection, which defines the orientation of the grid placement."
},
"description": "Reference to a second grid axis intersection, which defines the orientation of the grid placement.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcgridplacement.htm"
},
"IfcGroup": {
"attributes": {
"IsGroupedBy": "Contains the relationship that assigns the group members to the group object."
},
"description": "Contains the relationship that assigns the group members to the group object.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcgroup.htm"
},
"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": "The space dimensionality of this class, it is always 3 3",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifchalfspacesolid.htm"
},
"IfcHeatExchangerType": {
"attributes": {
"PredefinedType": "Defines the basic types of heat exchanger (e.g., plate, shell and tube, etc.)."
},
"description": "Defines the basic types of heat exchanger (e.g., plate, shell and tube, etc.).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcheatexchangertype.htm"
},
"IfcHumidifierType": {
"attributes": {
"PredefinedType": "Defines the type of humidifier."
},
"description": "Defines the type of humidifier.",
"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": "Usually measured in [m3/s].",
"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": "The fillet between the web and the flange, if not given, zero is assumed.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcishapeprofiledef.htm"
},
"IfcImageTexture": {
"attributes": {
"UrlReference": ""
},
"description": "",
"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 estimate of the original cost value of the inventory.",
"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": "The collection of time series values.",
"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": "A list of time-series values. At least one value is required.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctimeseriesresource/lexical/ifcirregulartimeseriesvalue.htm"
},
"IfcJunctionBoxType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of junction boxes from which the type required may be set."
},
"description": "Identifies the predefined types of junction boxes from which the type required may be set.",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInX</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"CentreOfGravityInY": "Location of centre of gravity along the Y axis measured from the center of the bounding box. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInY</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"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": "Location of centre of gravity along the Y axis measured from the center of the bounding box. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInY</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"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": "The skill set required for this type of labor.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstructionmgmtdomain/lexical/ifclaborresource.htm"
},
"IfcLampType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of lamp from which the type required may be set."
},
"description": "Identifies the predefined types of lamp from which the type required may be set.",
"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": "Information on the library being referenced.",
"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": "The library information that is being referenced.",
"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 &#945;, &#946; or &#947; angles) according to the light distribution curve chosen. > NOTE: The _SecondaryPlaneAngle_ and _LuminousIntensity_ lists are corresponding lists."
},
"description": "The luminous intensity distribution measure for this pair of main and secondary plane angles according to the light distribution curve chosen.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifclightdistributiondata.htm"
},
"IfcLightFixtureType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of light fixture from which the type required may be set."
},
"description": "Identifies the predefined types of light fixture from which the type required may be set.",
"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 &#946; or &#947; 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": "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 &#946; or &#947; angles) and the according luminous intensity distribution measures.",
"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 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).",
"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: 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.",
"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.",
"Position": "The position of the light source. It is used to orientate the light distribution curves."
},
"description": "The data source from which light distribution data is obtained.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifclightsourcegoniometric.htm"
},
"IfcLightSourcePositional": {
"attributes": {
"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.",
"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.",
"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.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifclightsourcepositional.htm"
},
"IfcLightSourceSpot": {
"attributes": {
"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).",
"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.",
"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.",
"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."
},
"description": "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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifclightsourcespot.htm"
},
"IfcLine": {
"attributes": {
"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": "The direction of the line, the magnitude and units of Dir affect the parameterization of the line.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcline.htm"
},
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifclineardimension.htm"
},
"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.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifclocalplacement.htm"
},
"IfcLocalTime": {
"attributes": {
"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."
},
"description": "The offset of daylight saving time from basis time.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcdatetimeresource/lexical/ifclocaltime.htm"
},
"IfcLoop": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcloop.htm"
},
"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."
},
"description": "A closed shell defining the exterior boundary of the solid. The shell normal shall point away from the interior of the solid.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcmanifoldsolidbrep.htm"
},
"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": "A representation item that is the target onto which the mapping source is mapped. It is constraint to be a Cartesian transformation operator.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcmappeditem.htm"
},
"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. > <small><font color=\"#ff0000\">IFC2x Edition 3 CHANGE&nbsp; The inverse attribute <i>HasRepresentation</i> has been added.</font></small>",
"Name": "Name of the material."
},
"description": "Reference to the relationship pointing to the classification(s) of the material.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialresource/lexical/ifcmaterial.htm"
},
"IfcMaterialClassificationRelationship": {
"attributes": {
"ClassifiedMaterial": "Material being classified.",
"MaterialClassifications": "The material classifications identifying the type of material."
},
"description": "Material being classified.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialresource/lexical/ifcmaterialclassificationrelationship.htm"
},
"IfcMaterialDefinitionRepresentation": {
"attributes": {
"RepresentedMaterial": "Reference to the material to which the representation applies."
},
"description": "Reference to the material to which the representation applies.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcmaterialdefinitionrepresentation.htm"
},
"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": "Reference to the material layer set, in which the material layer is included.",
"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": "Total thickness of the material layer set is derived from the function IfcMlsTotalThickness. IfcMlsTotalThickness(SELF)",
"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). > <small>NOTE&nbsp; the <i>LayerSetDirection</i> for <i>IfcWallStandardCase</i> shall be AXIS2 (i.e. the y-axis) and for standard <i>IfcSlab</i> it shall be AXIS3 (i.e. the z-axis). </small>",
"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": "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_.",
"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": "Materials used in a composition of substances.",
"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": "Reference to the material to which the set of properties is assigned.",
"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": "The unit in which the physical quantity is expressed.",
"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": "Description of the water impermeability denoting the water repelling properties.",
"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": "The nominal length describing the longitudinal dimensions of the fastener.",
"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).",
"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": "A measure of the expansion coefficient for warming up the material about one Kelvin.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcmechanicalmaterialproperties.htm"
},
"IfcMechanicalSteelMaterialProperties": {
"attributes": {
"HardeningModule": "A measure of the hardening module of the material (slope of stress versus strain curve after yield range).",
"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.",
"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%.",
"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.",
"UltimateStrain": "A measure of the (engineering) strain at the state of ultimate stress of the material.",
"UltimateStress": "A measure of the ultimate stress of the material.",
"YieldStress": "A measure of the yield stress (or characteristic 0.2 percent proof stress) of the material."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcmechanicalsteelmaterialproperties.htm"
},
"IfcMember": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcmember.htm"
},
"IfcMemberType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of a linear structural member element from which the type required may be set."
},
"description": "Identifies the predefined types of a linear structural member element from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcmembertype.htm"
},
"IfcMetric": {
"attributes": {
"Benchmark": "Enumeration that identifies the type of benchmark data.",
"DataValue": "Value with data type defined by the DataType enumeration.",
"ValueSource": "Reference source for data values."
},
"description": "Value with data type defined by the DataType enumeration.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstraintresource/lexical/ifcmetric.htm"
},
"IfcMonetaryUnit": {
"attributes": {
"Currency": "The international enumeration name of the currency."
},
"description": "The international enumeration name of the currency.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcmonetaryunit.htm"
},
"IfcMotorConnectionType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of motor connection from which the type required may be set."
},
"description": "Identifies the predefined types of motor connection from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcmotorconnectiontype.htm"
},
"IfcMove": {
"attributes": {
"MoveFrom": "The place from which actors and their associated equipment are moving.",
"MoveTo": "The place to which actors and their associated equipment are moving.",
"PunchList": "A list of points concerning a move that require attention."
},
"description": "A list of points concerning a move that require attention.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcmove.htm"
},
"IfcNamedUnit": {
"attributes": {
"Dimensions": "The dimensional exponents of the SI base units by which the named unit is defined.",
"UnitType": "The type of the unit."
},
"description": "The type of the unit.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcnamedunit.htm"
},
"IfcObject": {
"attributes": {
"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.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcobject.htm"
},
"IfcObjectDefinition": {
"attributes": {
"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).",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcobjectdefinition.htm"
},
"IfcObjectPlacement": {
"attributes": {
"PlacesObject": "The _IfcObjectPlacement_ shall be used to provide a placement and an object coordinate system for a single instance of _IfcProduct_. > <small> <font color=\"#FF0000\">IFC2x Edition 3 CHANGE&nbsp; New inverse attribute.</font> </small>",
"ReferencedByPlacements": "Placements that are given relative to this placement of an object."
},
"description": "Placements that are given relative to this placement of an object.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcobjectplacement.htm"
},
"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": "A user defined value that qualifies the type of objective constraint when ObjectiveQualifier attribute of type _IfcObjectiveEnum_ has value USERDEFINED.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstraintresource/lexical/ifcobjective.htm"
},
"IfcOccupant": {
"attributes": {
"PredefinedType": "Predefined occupant types from which that required may be set."
},
"description": "Predefined occupant types from which that required may be set.",
"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).)",
"SelfIntersect": "An indication of whether the offset curve self-intersects; this is for information only."
},
"description": "An indication of whether the offset curve self-intersects; this is for information only.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcoffsetcurve2d.htm"
},
"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": "The direction used to define the direction of the offset curve 3d from the basis curve.",
"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": "A vector which specifies the relative positioning of hatch lines.",
"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.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcopeningelement.htm"
},
"IfcOpticalMaterialProperties": {
"attributes": {
"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.",
"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.",
"SolarTransmittance": "Transmittance at normal incidence (solar). Defines the fraction of solar radiation that passes through per unit area, perpendicular to the surface.",
"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.",
"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.",
"ThermalIrTransmittance": "Thermal IR transmittance at normal incidence. Defines the fraction of thermal energy that passes through per unit area, perpendicular to the surface.",
"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.",
"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.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcopticalmaterialproperties.htm"
},
"IfcOrderAction": {
"attributes": {
"ActionID": "A unique identifier assigned to an action on issue."
},
"description": "A unique identifier assigned to an action on issue.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcorderaction.htm"
},
"IfcOrganization": {
"attributes": {
"Addresses": "Postal and telecom addresses of an organization. > <font size=\"-1\">NOTE: There may be several addresses related to an organization. </font>",
"Description": "Text that relates the nature of the organization.",
"Engages": "Inverse relationship to IfcPersonAndOrganization relationships in which IfcOrganization is engaged.",
"Id": "Identification of the organization.",
"IsRelatedBy": "The inverse relationship for relationship RelatedOrganizations of IfcOrganizationRelationship.",
"Name": "The word, or group of words, by which the organization is referred to.",
"Relates": "The inverse relationship for relationship RelatingOrganization of IfcOrganizationRelationship.",
"Roles": "Roles played by the organization."
},
"description": "Inverse relationship to IfcPersonAndOrganization relationships in which IfcOrganization is engaged.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcorganization.htm"
},
"IfcOrganizationRelationship": {
"attributes": {
"Description": "Text that relates the nature of the relationship.",
"Name": "The word or group of words by which the relationship is referred to.",
"RelatedOrganizations": "The other, possibly dependent, organizations which are the related parts of the relationship between organizations.",
"RelatingOrganization": "Organization which is the relating part of the relationship between organizations."
},
"description": "The other, possibly dependent, organizations which are the related parts of the relationship between organizations.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcorganizationrelationship.htm"
},
"IfcOrientedEdge": {
"attributes": {
"EdgeElement": "Edge entity used to construct this oriented edge.",
"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)",
"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)",
"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."
},
"description": "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)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcorientededge.htm"
},
"IfcOutletType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of outlet from which the type required may be set."
},
"description": "Identifies the predefined types of outlet from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcelectricaldomain/lexical/ifcoutlettype.htm"
},
"IfcOwnerHistory": {
"attributes": {
"ChangeAction": "Enumeration that defines the actions associated with changes made to the object.",
"CreationDate": "Time and date of creation.",
"LastModifiedDate": "Date and Time at which the last modification occurred.",
"LastModifyingApplication": "Application used to carry out the last modification.",
"LastModifyingUser": "User who carried out the last modification.",
"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.",
"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.",
"State": "Enumeration that defines the current access state of the object."
},
"description": "Time and date of creation.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcutilityresource/lexical/ifcownerhistory.htm"
},
"IfcParameterizedProfileDef": {
"attributes": {
"Position": "Position coordinate system of the parameterized profile definition."
},
"description": "Position coordinate system of the parameterized profile definition.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcparameterizedprofiledef.htm"
},
"IfcPath": {
"attributes": {
"EdgeList": "The list of oriented edges which are concatenated together to form this path."
},
"description": "The list of oriented edges which are concatenated together to form this path.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcpath.htm"
},
"IfcPerformanceHistory": {
"attributes": {
"LifeCyclePhase": "Describes the applicable building life-cycle phase. Typical values should be DESIGNDEVELOPMENT, SCHEMATICDEVELOPMENT, CONSTRUCTIONDOCUMENT, CONSTRUCTION, ASBUILT, COMMISSIONING, OPERATION, etc."
},
"description": "Describes the applicable building life-cycle phase. Typical values should be DESIGNDEVELOPMENT, SCHEMATICDEVELOPMENT, CONSTRUCTIONDOCUMENT, CONSTRUCTION, ASBUILT, COMMISSIONING, OPERATION, etc.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccontrolextension/lexical/ifcperformancehistory.htm"
},
"IfcPermeableCoveringProperties": {
"attributes": {
"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.",
"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.",
"OperationType": "Types of permeable covering operations. Also used to assign standard symbolic presentations according to national building standards.",
"PanelPosition": "Position of this permeable covering panel within the overall window or door type.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcarchitecturedomain/lexical/ifcpermeablecoveringproperties.htm"
},
"IfcPermit": {
"attributes": {
"PermitID": "A unique identifier assigned to a permit."
},
"description": "A unique identifier assigned to a permit.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcfacilitiesmgmtdomain/lexical/ifcpermit.htm"
},
"IfcPerson": {
"attributes": {
"Addresses": "Postal and telecommunication addresses of a person. > <font size=\"-1\">NOTE - A person may have several addresses. </font>",
"EngagedIn": "The inverse relationship to IfcPersonAndOrganization relationships in which IfcPerson is engaged.",
"FamilyName": "The name by which the family identity of the person may be recognized. > <font size=\"-1\">NOTE: Depending on geographical location and culture, family name may appear either as the first or last component of a name.</font>",
"GivenName": "The name by which a person is known within a family and by which he or she may be familiarly recognized. > <font size=\"-1\">NOTE: Depending on geographical location and culture, given name may appear either as the first or last component of a name. </font>",
"Id": "Identification of the person.",
"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. > <font size=\"-1\">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. </font>",
"PrefixTitles": "The word, or group of words, which specify the person's social and/or professional standing and appear before his/her names.",
"Roles": "Roles played by the person.",
"SuffixTitles": "The word, or group of words, which specify the person's social and/or professional standing and appear after his/her names."
},
"description": "The inverse relationship to IfcPersonAndOrganization relationships in which IfcPerson is engaged.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcperson.htm"
},
"IfcPersonAndOrganization": {
"attributes": {
"Roles": "Roles played by the person within the context of an organization.",
"TheOrganization": "The organization to which the person is related.",
"ThePerson": "The person who is related to the organization."
},
"description": "Roles played by the person within the context of an organization.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcactorresource/lexical/ifcpersonandorganization.htm"
},
"IfcPhysicalComplexQuantity": {
"attributes": {
"Discrimination": "Identification of the discrimination by which this physical complex property is distinguished. Examples of discriminations are 'layer', 'steel bar diameter', etc.",
"HasQuantities": "Set of physical quantities that are grouped by this complex physical quantity according to a given discrimination.",
"Quality": "Additional indication of a quality of the quantities that are grouped under this physical complex quantity.",
"Usage": "Additional indication of a usage type of the quantities that are grouped under this physical complex quantity."
},
"description": "Additional indication of a usage type of the quantities that are grouped under this physical complex quantity.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcphysicalcomplexquantity.htm"
},
"IfcPhysicalQuantity": {
"attributes": {
"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.",
"PartOfComplex": "Reference to a physical complex quantity in which the physical quantity may be contained."
},
"description": "Reference to a physical complex quantity in which the physical quantity may be contained.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcphysicalquantity.htm"
},
"IfcPhysicalSimpleQuantity": {
"attributes": {
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcphysicalsimplequantity.htm"
},
"IfcPile": {
"attributes": {
"ConstructionType": "General designator for how the pile is constructed.",
"PredefinedType": "The predefined generic type of the pile according to function."
},
"description": "General designator for how the pile is constructed.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralelementsdomain/lexical/ifcpile.htm"
},
"IfcPipeFittingType": {
"attributes": {
"PredefinedType": "The type of pipe fitting."
},
"description": "The type of pipe fitting.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcpipefittingtype.htm"
},
"IfcPipeSegmentType": {
"attributes": {
"PredefinedType": "The type of pipe segment."
},
"description": "The type of pipe segment.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcpipesegmenttype.htm"
},
"IfcPixelTexture": {
"attributes": {
"ColourComponents": "Indication whether the pixel values contain a 1, 2, 3, or 4 colour component.",
"Height": "The number of pixels in height (T) direction.",
"Pixel": "Flat list of hexadecimal values, each describing one pixel by 1, 2, 3, or 4 components. > <small><font color\"#ff0000\"=\"\"> IFC2x Edition 3 CHANGE&nbsp; The data type has been changed from STRING to BINARY. </font></small>",
"Width": "The number of pixels in width (S) direction."
},
"description": "Flat list of hexadecimal values, each describing one pixel by 1, 2, 3, or 4 components. > <small><font color\"#ff0000\"=\"\"> IFC2x Edition 3 CHANGE&nbsp; The data type has been changed from STRING to BINARY. </font></small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcpixeltexture.htm"
},
"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": "The space dimensionality of this class, derived from the dimensionality of the location. Location.Dim",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcplacement.htm"
},
"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. > <small>NOTE&nbsp; In case of a 3D placement by <i>IfcAxisPlacement3D the <i>IfcPlanarBox</i> is defined within the xy plane of the definition coordinate system.</i></small>"
},
"description": "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. > <small>NOTE&nbsp; In case of a 3D placement by <i>IfcAxisPlacement3D the <i>IfcPlanarBox</i> is defined within the xy plane of the definition coordinate system.</i></small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifcplanarbox.htm"
},
"IfcPlanarExtent": {
"attributes": {
"SizeInX": "The extent in the direction of the x-axis.",
"SizeInY": "The extent in the direction of the y-axis."
},
"description": "The extent in the direction of the y-axis.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationresource/lexical/ifcplanarextent.htm"
},
"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:",
"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": {
"attributes": {
"PredefinedType": "Identifies the predefined types of a planar structural member element from which the type required may be set."
},
"description": "Identifies the predefined types of a planar structural member element from which the type required may be set.",
"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": "The space dimensionality of this class, determined by the space dimensionality of the basis curve. BasisCurve.Dim",
"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": "The space dimensionality of this class, determined by the space dimensionality of the basis surface. BasisSurface.Dim",
"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": "List of points defining the loop. There are no repeated points in the list.",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute type has been changed from <i>IfcPolyline</i> to its supertype <i>IfcBoundedCurve</i> with upward compatibility for file based exchange. </font></small>",
"Position": "Definition of the position coordinate system for the bounding polyline ~~and the base surface~~."
},
"description": "Two-dimensional ~~polyline~~ bounded curve, defined in the xy plane of the position coordinate system. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute type has been changed from <i>IfcPolyline</i> to its supertype <i>IfcBoundedCurve</i> with upward compatibility for file based exchange. </font></small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcpolygonalboundedhalfspace.htm"
},
"IfcPolyline": {
"attributes": {
"Points": "The points defining the polyline."
},
"description": "The points defining the polyline.",
"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": "Reference to the port connection relationship. The relationship then refers to the other port to which this port is connected.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcport.htm"
},
"IfcPostalAddress": {
"attributes": {
"AddressLines": "The postal address. > <font size=\"-1\">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. </font>",
"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. > <font size=\"-1\">NOTE: The counties of the United Kingdom and the states of North America are examples of regions. </font>",
"Town": "The name of a town."
},
"description": "The name of a country.",
"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:",
"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": "The string by which the pre defined item is identified. Allowable values for the string are declared at the level of subtypes.",
"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:",
"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:",
"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:",
"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": "An (internal) identifier assigned to the layer.",
"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. > <small> NOTE&nbsp; In most cases the assignment of styles to a layer is restricted to an <i>IfcCurveStyle</i> representing the layer curve colour, layer curve thickness, and layer curve type. </small>"
},
"description": "Assignment of presentation styles to the layer to provide a default style for representation items. > <small> NOTE&nbsp; In most cases the assignment of styles to a layer is restricted to an <i>IfcCurveStyle</i> representing the layer curve colour, layer curve thickness, and layer curve type. </small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationorganizationresource/lexical/ifcpresentationlayerwithstyle.htm"
},
"IfcPresentationStyle": {
"attributes": {
"Name": "Name of the presentation style."
},
"description": "Name of the presentation style.",
"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": "A set of presentation styles that are assigned to 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": "A user defined procedure type.",
"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": "Relative placement in time, refers to the subsequent processes for which this process is predecessor.",
"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": "Reference to the IfcRelAssignsToProduct relationship, by which other subtypes of IfcObject can be related to the product.",
"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_. > <small> <font color=\"#FF0000\">IFC2x Edition 3 CHANGE&nbsp; New inverse attribute.</font> </small>"
},
"description": "Reference to the shape aspect that represents part of the shape or its feature distinctively.",
"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": "Contained list of representations (including shape representations). Each member defines a valid representation of a particular type within a particular representation context.",
"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": "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.",
"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": "Name of the profile type according to some standard profile table.",
"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": "Optional reference to an instance of IfcProfileDef, which contains a further geometrical definition.",
"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": "Units globally assigned to measure types used within the context of this project.",
"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.",
"PredefinedType": "The type of project order.",
"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": "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",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedmgmtelements/lexical/ifcprojectorder.htm"
},
"IfcProjectOrderRecord": {
"attributes": {
"PredefinedType": "Identifies the type of project incident.",
"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": "Identifies the type of project incident.",
"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.",
"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": "Reference to the IfcComplexProperty in which the IfcProperty is contained.",
"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": "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.",
"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": "A description that may apply additional information about a property constraint relationship.",
"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": "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.",
"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": "Expression that further describes the nature of the dependency relation.",
"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": "Enumeration from which a enumeration value has been selected. The referenced enumeration also establishes the unit of the enumeration value.",
"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": "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.",
"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": "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.",
"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": "Reference to another entity through one of the select types in 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": "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.",
"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": "The property style to which the property set might belong.",
"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. > <small> NOTE&nbsp; By virtue of the defined data type, that is selected from the SELECT <i>IfcValue</i>, the appropriate unit can be found within the <i>IfcUnitAssignment</i>, defined for the project if no value for the unit attribute is given.<br> <font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute has been made optional with upward compatibility for file based exchange. </font> </small>",
"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": "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.",
"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": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifcpropertytablevalue.htm"
},
"IfcProtectiveDeviceType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of protective device from which the type required may be set."
},
"description": "Identifies the predefined types of protective device from which the type required may be set.",
"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 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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcproxy.htm"
},
"IfcPumpType": {
"attributes": {
"PredefinedType": "Defines the type of pump typically used in building services."
},
"description": "Defines the type of pump typically used in building services.",
"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": "Area measure value of this quantity.",
"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": "Count measure value of this quantity.",
"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": "Length measure value of this quantity.",
"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": "Time measure value of this quantity.",
"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": "Volume measure value of this quantity.",
"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": "Mass measure value of this quantity.",
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcradiusdimension.htm"
},
"IfcRailing": {
"attributes": {
"PredefinedType": "Predefined generic types for a railing that are specified in an enumeration. There may be a property set given for the predefined types. > <font size=\"-1\">NOTE: The use of the predefined type directly at the occurrence object level of <i>IfcRailing</i> is only permitted, if no type object <i>IfcRailingType</i> is assigned.</font> > <font color=\"#FF0000\" size=\"-1\">IFC2x PLATFORM CHANGE: The attribute has been changed into an OPTIONAL attribute. </font>"
},
"description": "Predefined generic types for a railing that are specified in an enumeration. There may be a property set given for the predefined types. > <font size=\"-1\">NOTE: The use of the predefined type directly at the occurrence object level of <i>IfcRailing</i> is only permitted, if no type object <i>IfcRailingType</i> is assigned.</font> > <font color=\"#FF0000\" size=\"-1\">IFC2x PLATFORM CHANGE: The attribute has been changed into an OPTIONAL attribute. </font>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcrailing.htm"
},
"IfcRailingType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of a railing element from which the type required may be set."
},
"description": "Identifies the predefined types of a railing element from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcrailingtype.htm"
},
"IfcRamp": {
"attributes": {
"ShapeType": "Predefined shape types for a ramp that are specified in an Enum."
},
"description": "Predefined shape types for a ramp that are specified in an Enum.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcramp.htm"
},
"IfcRampFlight": {
"description": "Inclined slab segment, normally providing a human circulation link between two landings, floors or slabs at different elevations.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcrampflight.htm"
},
"IfcRampFlightType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of a ramp flight element from which the type required may be set."
},
"description": "Identifies the predefined types of a ramp flight element from which the type required may be set.",
"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": "The array of weights associated with the control points. This is derived from the weights data. IfcListToArray(WeightsData,0,SELF\\IfcBSplineCurve.UpperIndexOnControlPoints)",
"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": "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.",
"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": "The extent of the rectangle in the direction of the y-axis.",
"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": "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]_.",
"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": "BasisSurface.Dim",
"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": "A description of the relationship to the document from which values may be referenced.",
"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": "The collection of time series 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": "The number of bars with identical nominal diameter and steel grade included in the specific reinforcement configuration.",
"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": "The list of section reinforcement properties attached to the reinforcement definition properties.",
"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": "Indicator for whether the bar surface is plain or textured.",
"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": "The nominal steel grade defined according to local standards.",
"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": "The spacing between the transverse bars. Note: an even distribution of bars is presumed; other cases are handled by Psets.",
"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.",
"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": "Particular type of the assignment relationship. It can constrain the applicable object types, used within the role of RelatedObjects.",
"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": "Contained object for the time related information for the work schedule element.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprocessextension/lexical/ifcrelassignstasks.htm"
},
"IfcRelAssignsToActor": {
"attributes": {
"ActingRole": "Role of the actor played within the context of the assignment to the object(s).",
"RelatingActor": "Reference to the information about the actor. It comprises the information about the person or organization and its addresses."
},
"description": "Role of the actor played within the context of the assignment to the object(s).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassignstoactor.htm"
},
"IfcRelAssignsToControl": {
"attributes": {
"RelatingControl": "Reference to the control that applies an control about objects."
},
"description": "Reference to the control that applies an control about objects.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassignstocontrol.htm"
},
"IfcRelAssignsToGroup": {
"attributes": {
"RelatingGroup": "Reference to group that finally contains all assigned group members."
},
"description": "Reference to group that finally contains all assigned group members.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassignstogroup.htm"
},
"IfcRelAssignsToProcess": {
"attributes": {
"QuantityInProcess": "Quantity of the object specific for the operation by this process.",
"RelatingProcess": "Reference to the process to which the objects are assigned to."
},
"description": "Quantity of the object specific for the operation by this process.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassignstoprocess.htm"
},
"IfcRelAssignsToProduct": {
"attributes": {
"RelatingProduct": "Reference to the Product to which the objects are assigned to."
},
"description": "Reference to the Product to which the objects are assigned to.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassignstoproduct.htm"
},
"IfcRelAssignsToProjectOrder": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedmgmtelements/lexical/ifcrelassignstoprojectorder.htm"
},
"IfcRelAssignsToResource": {
"attributes": {
"RelatingResource": "Reference to the resource to which the objects are assigned to."
},
"description": "Reference to the resource to which the objects are assigned to.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassignstoresource.htm"
},
"IfcRelAssociates": {
"attributes": {
"RelatedObjects": "Objects or Types, to which the external references or information is associated."
},
"description": "Objects or Types, to which the external references or information is associated.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassociates.htm"
},
"IfcRelAssociatesAppliedValue": {
"attributes": {
"RelatingAppliedValue": ""
},
"description": "",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedmgmtelements/lexical/ifcrelassociatesappliedvalue.htm"
},
"IfcRelAssociatesApproval": {
"attributes": {
"RelatingApproval": "Reference to approval that is being applied using this relationship."
},
"description": "Reference to approval that is being applied using this relationship.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccontrolextension/lexical/ifcrelassociatesapproval.htm"
},
"IfcRelAssociatesClassification": {
"attributes": {
"RelatingClassification": "Classification applied to the objects."
},
"description": "Classification applied to the objects.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassociatesclassification.htm"
},
"IfcRelAssociatesConstraint": {
"attributes": {
"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.",
"RelatingConstraint": "Reference to constraint that is being applied using this relationship."
},
"description": "Reference to constraint that is being applied using this relationship.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifccontrolextension/lexical/ifcrelassociatesconstraint.htm"
},
"IfcRelAssociatesDocument": {
"attributes": {
"RelatingDocument": "Document information or reference which is applied to the objects."
},
"description": "Document information or reference which is applied to the objects.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassociatesdocument.htm"
},
"IfcRelAssociatesLibrary": {
"attributes": {
"RelatingLibrary": "Reference to a library, from which the definition of the property set is taken."
},
"description": "Reference to a library, from which the definition of the property set is taken.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelassociateslibrary.htm"
},
"IfcRelAssociatesMaterial": {
"attributes": {
"RelatingMaterial": "Material definition (either a single material, a list of materials, or a set of material layers) assigned to the elements."
},
"description": "Material definition (either a single material, a list of materials, or a set of material layers) assigned to the elements.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelassociatesmaterial.htm"
},
"IfcRelAssociatesProfileProperties": {
"attributes": {
"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 &beta; 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. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute <i>ProfileOrientation</i> is a new attribute. </font></small>",
"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.",
"RelatingProfileProperties": "Profile property definition assigned to the instances."
},
"description": "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 &beta; 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. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute <i>ProfileOrientation</i> is a new attribute. </font></small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcrelassociatesprofileproperties.htm"
},
"IfcRelConnects": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcrelconnects.htm"
},
"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."
},
"description": "Reference to an Element that is connected by the objectified relationship.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelconnectselements.htm"
},
"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."
},
"description": "Indication of the connection type in relation to the path of the RelatingObject.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcrelconnectspathelements.htm"
},
"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."
},
"description": "Reference to an Element that is connected by the objectified relationship.",
"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."
},
"description": "Defines the element that realizes a port connection relationship.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelconnectsports.htm"
},
"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": "Reference to an instance of IfcStructuralActivity (or its subclasses) which is acting upon the specified structural element (represented by a respective structural representation entity).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcrelconnectsstructuralactivity.htm"
},
"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 structural member that is associated with the element of which it represents the analytical idealization.",
"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. > <font size=\"-1\"> NOTE&nbsp; The boundary condition applied to a member-connection-relationship is also called \"release\"</font>",
"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": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcrelconnectsstructuralmember.htm"
},
"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 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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcrelconnectswitheccentricity.htm"
},
"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": "The type of the connection given for informal purposes, it may include labels, like 'joint', 'rigid joint', 'flexible joint', etc.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelconnectswithrealizingelements.htm"
},
"IfcRelContainedInSpatialStructure": {
"attributes": {
"RelatedElements": "Set of ~~elements~~ products, which are contained within this level of the spatial structure hierarchy. > <font color=\"#ff0000\"><small> IFC2x PLATFORM CHANGE&nbsp; The data type has been changed from <i>IfcElement</i> to <i>IfcProduct</i> with upward compatibility <small></small></small></font>",
"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": "Spatial structure element, within which the element is contained. Any element can only be contained within one element of the project spatial structure.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelcontainedinspatialstructure.htm"
},
"IfcRelCoversBldgElements": {
"attributes": {
"RelatedCoverings": "Relationship to the set of coverings at this element.",
"RelatingBuildingElement": "Relationship to the element that is covered."
},
"description": "Relationship to the set of coverings at this element.",
"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": "Relationship to the set of coverings covering this space.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcrelcoversspaces.htm"
},
"IfcRelDecomposes": {
"attributes": {
"RelatedObjects": "The objects being nested or aggregated.",
"RelatingObject": "The object that represents the nest or aggregation."
},
"description": "The objects being nested or aggregated.",
"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": "Reference to the objects (or single object) to which the property definition applies.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifcreldefines.htm"
},
"IfcRelDefinesByProperties": {
"attributes": {
"RelatingPropertyDefinition": "Reference to the property set definition for that object or set of objects."
},
"description": "Reference to the property set definition for that object or set of objects.",
"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": "Reference to the type (or style) information for that object or set of objects.",
"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. > <small><font color=\"#ff0000\"> IFC2x PLATFORM CHANGE: The data type has been changed from <i>IfcBuildingElement</i> to <i>IfcElement</i> with upward compatibility for file based exchange. </font><small></small></small>",
"RelatingOpeningElement": "Opening Element being filled by virtue of this relationship."
},
"description": "Reference to ~~building~~ element that occupies fully or partially the associated opening. > <small><font color=\"#ff0000\"> IFC2x PLATFORM CHANGE: The data type has been changed from <i>IfcBuildingElement</i> to <i>IfcElement</i> with upward compatibility for file based exchange. </font><small></small></small>",
"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": "Relationship to a distribution flow element",
"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": "Relating space program for the interaction requirement.",
"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.",
"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": "A property set, which contains those properties, that have a different value for the subset of objects.",
"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": "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.",
"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. > <small>NOTE&nbsp; 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.</small>",
"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": "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.",
"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.",
"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": "The way in which the time lag applies to the sequence.",
"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. > <small><font color=\"#FF0000\"> IFC2x PLATFORM CHANGE&nbsp; The data type has been changed from <i>IfcBuilding</i> to <i>IfcSpatialStructureElement</i> with upward compatibility for file based exchange. </font></small>",
"RelatingSystem": "System that services the Buildings."
},
"description": "Spatial structure elements (including site, building, storeys) that are serviced by the system. > <small><font color=\"#FF0000\"> IFC2x PLATFORM CHANGE&nbsp; The data type has been changed from <i>IfcBuilding</i> to <i>IfcSpatialStructureElement</i> with upward compatibility for file based exchange. </font></small>",
"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. > <small><font color=\"#ff0000\"> IFC2x PLATFORM CHANGE&nbsp; The data type has been changed from <i>IfcConnectionSurfaceGeometry</i> to <i>IfcConnectionGeometry</i> with upward compatibility for file based exchange. </font></small>",
"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. > <small><font color=\"#ff0000\"> IFC2x PLATFORM CHANGE: The data type has been changed from <i>IfcBuildingElement</i> to <i>IfcElement</i> with upward compatibility for file based exchange. </font></small>",
"RelatingSpace": "Reference to one spaces that is delimited by this boundary."
},
"description": "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).",
"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. > <small><font color=\"#ff0000\"> IFC2x PLATFORM CHANGE&nbsp; The data type has been changed from <i>IfcOpeningElement</i> to <i>IfcFeatureElementSubtraction</i> with upward compatibility for file based exchange. </font></small>",
"RelatingBuildingElement": "Reference to ~~building~~ element in which a void is created by associated ~~opening~~ feature subtraction element. > <small><font color=\"#ff0000\"> IFC2x PLATFORM CHANGE: The data type has been changed from <i>IfcBuildingElement</i> to <i>IfcElement</i> with upward compatibility for file based exchange. </font></small>"
},
"description": "Reference to the ~~opening~~ feature subtraction element which defines a void in the associated ~~opening~~ element. > <small><font color=\"#ff0000\"> IFC2x PLATFORM CHANGE&nbsp; The data type has been changed from <i>IfcOpeningElement</i> to <i>IfcFeatureElementSubtraction</i> with upward compatibility for file based exchange. </font></small>",
"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.",
"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": "Stress at the beginning. Given as relative to the yield stress of the material and is therefore dimensionless.",
"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_. > <small>NOTE&nbsp; Implementation agreements can restrict the maximum number of layer assignments to 1.</small> > <small><font color=\"#ff0000\">IFC2x Edition 3 CHANGE&nbsp; The inverse attribute <i>LayerAssignments</i> has been added. </font></small>",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The inverse attribute <i>LayerAssignments</i> has been added. </font></small>",
"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": "Reference to the product shape, for which it is the shape representation.",
"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": "All shape representations that are defined in the same representation context.",
"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_. > <small>NOTE&nbsp; Implementation agreements can restrict the maximum number of layer assignments to 1.</small> > <small><font color=\"#ff0000\">IFC2x Edition 3 CHANGE&nbsp; The inverse attribute <i>LayerAssignments</i> has been added.</font></small>",
"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. > <small><font color=\"#ff0000\">IFC2x Edition 3 CHANGE&nbsp; The inverse attribute <i>StyledByItem</i> has been added.</font></small>"
},
"description": "Reference to the _IfcStyledItem_ that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve. > <small><font color=\"#ff0000\">IFC2x Edition 3 CHANGE&nbsp; The inverse attribute <i>StyledByItem</i> has been added.</font></small>",
"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": "",
"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": "Reference to the IfcRelAssignsToResource relationship and thus pointing to those objects, which are used as resources.",
"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": "The line of the axis of revolution. IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcCurve() || IfcLine(Axis.Location, IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector(Axis.Z,1.0))",
"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": "Defines the direction of profile definition as described on figure above.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofilepropertyresource/lexical/ifcribplateprofileproperties.htm"
},
"IfcRightCircularCone": {
"attributes": {
"BottomRadius": "",
"Height": ""
},
"description": "",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcrightcircularcone.htm"
},
"IfcRightCircularCylinder": {
"attributes": {
"Height": "",
"Radius": ""
},
"description": "",
"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": "Predefined shape types for a roof that are specified in an enumeration.",
"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": "Optional description, provided for exchanging informative comments.",
"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": "The radius of the feature cross section.",
"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": "Radius of the circular arcs, by which all four corners of the rectangle are equally rounded. If not given, zero (= no rounding arcs) applies.",
"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": "The dimensional exponents of SI units are derived by function _IfcDimensionsForSiUnit_. IfcDimensionsForSiUnit (SELF.Name)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcsiunit.htm"
},
"IfcSanitaryTerminalType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of sanitary terminal from which the type required may be set."
},
"description": "Identifies the predefined types of sanitary terminal from which the type required may be set.",
"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 assigned schedule time control in the relationship.",
"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": "The cross section profile at the end point of the longitudinal section.",
"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": "The set of reinforcment properties attached to a section reinforcement properties definition.",
"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": "The dimensionality of the spine curve is always 3. 3",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcsectionedspine.htm"
},
"IfcSensorType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of sensor from which the type required may be set."
},
"description": "Identifies the predefined types of sensor from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcbuildingcontrolsdomain/lexical/ifcsensortype.htm"
},
"IfcServiceLife": {
"attributes": {
"ServiceLifeDuration": "The length or duration of a service life.",
"ServiceLifeType": "Predefined service life types from which that required may be set."
},
"description": "The length or duration of a service life.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedfacilitieselements/lexical/ifcservicelife.htm"
},
"IfcServiceLifeFactor": {
"attributes": {
"LowerValue": "Lower of the three values assigned to the service life factor.",
"MostUsedValue": "Most used of the three values assigned to the service life factor.",
"PredefinedType": "Predefined service life factor types from which that required may be set.",
"UpperValue": "Upper of the three values assigned to the service life factor."
},
"description": "Lower of the three values assigned to the service life factor.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedfacilitieselements/lexical/ifcservicelifefactor.htm"
},
"IfcShapeAspect": {
"attributes": {
"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.",
"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.",
"PartOfProductDefinitionShape": "Reference to the product definition shape of which this class is an aspect.",
"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. ---",
"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. > <small><font color=\"#FF0000\">IFC2x Edition 3 CHANGE&nbsp; The data type has been changed from <i>IfcShapeRepresentation</i> to <i>IfcShapeModel</i> with upward compatibility </font></small>"
},
"description": "Reference to the product definition shape of which this class is an aspect.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcshapeaspect.htm"
},
"IfcShapeModel": {
"attributes": {
"OfShapeAspect": "Reference to the shape aspect, for which it is the shape representation."
},
"description": "Reference to the shape aspect, for which it is the shape representation.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcshapemodel.htm"
},
"IfcShapeRepresentation": {
"description": "Definition from ISO/CD 10303-42:1992: The shape representation is a specific kind of representation that represents a shape.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcshaperepresentation.htm"
},
"IfcShellBasedSurfaceModel": {
"attributes": {
"Dim": "The space dimensionality of this class, it is always 3. 3",
"SbsmBoundary": ""
},
"description": "The space dimensionality of this class, it is always 3. 3",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcshellbasedsurfacemodel.htm"
},
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpropertyresource/lexical/ifcsimpleproperty.htm"
},
"IfcSite": {
"attributes": {
"LandTitleNumber": "The land title number (designation of the site within a regional system).",
"RefElevation": "Datum elevation relative to sea level.",
"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. > <font size=\"-1\">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.</font>",
"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. > <font size=\"-1\">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.</font>",
"SiteAddress": "Address given to the site for postal purposes."
},
"description": "Address given to the site for postal purposes.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcsite.htm"
},
"IfcSlab": {
"attributes": {
"PredefinedType": "Predefined generic types for a slab that are specified in an enumeration. There may be a property set given for the predefined types. > <font size=\"-1\">NOTE: The use of the predefined type directly at the occurrence object level of <i>IfcSlab</i> is only permitted, if no type object <i>IfcSlabType</i> is assigned.</font> > <font color=\"#FF0000\" size=\"-1\">IFC2x PLATFORM CHANGE: The attribute has been changed into an OPTIONAL attribute. </font>"
},
"description": "Predefined generic types for a slab that are specified in an enumeration. There may be a property set given for the predefined types. > <font size=\"-1\">NOTE: The use of the predefined type directly at the occurrence object level of <i>IfcSlab</i> is only permitted, if no type object <i>IfcSlabType</i> is assigned.</font> > <font color=\"#FF0000\" size=\"-1\">IFC2x PLATFORM CHANGE: The attribute has been changed into an OPTIONAL attribute. </font>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcslab.htm"
},
"IfcSlabType": {
"attributes": {
"PredefinedType": "Type of the slab."
},
"description": "Type of the slab.",
"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": "Slippage of that connection. Defines the maximum displacement in z-direction without any loading applied.",
"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": "The space dimensionality of this class, it is always 3. 3",
"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": "Sound values at a specific frequency. There may be cases where less than eight values are specified.",
"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 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.",
"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. > <small> NOTE&nbsp; Coverings are often managed by the space, and not by the building element, which they cover.<br> <font color=\"#ff0000\">IFC2x Edition3 CHANGE&nbsp; New inverse relationship. Upward compatibility for file based exchange is guaranteed.</font> </small>",
"InteriorOrExteriorSpace": "Defines, whether the Space is interior (Internal), or exterior (External), i.e. part of the outer space."
},
"description": "Reference to Set of Space Boundaries that defines the physical or virtual delimitation of that Space.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcspace.htm"
},
"IfcSpaceHeaterType": {
"attributes": {
"PredefinedType": "Enumeration of possible types of space heater (e.g., baseboard heater, convector, radiator, etc.)."
},
"description": "Enumeration of possible types of space heater (e.g., baseboard heater, convector, radiator, etc.).",
"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": "Set of inverse relationships to space or work interaction requirements (FOR RelatingObject).",
"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": "Defines the type of thermal load (e.g., sensible, latent, radiant, etc.).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgserviceelements/lexical/ifcspacethermalloadproperties.htm"
},
"IfcSpaceType": {
"attributes": {
"PredefinedType": "Predefined types to define the particular type of space. There may be property set definitions available for each predefined type."
},
"description": "Predefined types to define the particular type of space. There may be property set definitions available for each predefined type.",
"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. > <small> NOTE&nbsp; The spatial containment relationship, established by <i>IfcRelContainedInSpatialStructure</i>, is required to be an hierarchical relationship, i.e. each element can only be assigned to 0 or 1 spatial structure element. </small>",
"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. > <small> NOTE&nbsp; The spatial reference relationship, established by <i>IfcRelReferencedInSpatialStructure</i>, is not required to be an hierarchical relationship, i.e. each element can be assigned to 0, 1 or many spatial structure elements.<br> EXAMPLE&nbsp; A curtain wall maybe contained in the ground floor, but maybe referenced in all floors, it reaches.<br><br> <font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The inverse attribute has been added with upward compatibility for file based exchange. </font> </small>",
"ServicedBySystems": "Set of relationships to Systems, that provides a certain service to the Building. The relationship is handled by the objectified relationship IfcRelServicesBuildings."
},
"description": "Set of spatial containment relationships, that holds those elements, which are contained within this element of the project spatial structure. > <small> NOTE&nbsp; The spatial containment relationship, established by <i>IfcRelContainedInSpatialStructure</i>, is required to be an hierarchical relationship, i.e. each element can only be assigned to 0 or 1 spatial structure element. </small>",
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcspatialstructureelementtype.htm"
},
"IfcSphere": {
"attributes": {
"Radius": ""
},
"description": "",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcsphere.htm"
},
"IfcStackTerminalType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of stack terminal from which the type required may be set."
},
"description": "Identifies the predefined types of stack terminal from which the type required may be set.",
"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": "Predefined shape types for a stair that are specified in an Enum.",
"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": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcstairflight.htm"
},
"IfcStairFlightType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of a stair flight element from which the type required may be set."
},
"description": "Identifies the predefined types of a stair flight element from which the type required may be set.",
"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": "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.",
"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": "References to the IfcRelConnectsStructuralActivity relationship by which activities can be associated to structural representations.",
"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.",
"PredefinedType": "Defines the type of the structural analysis model."
},
"description": "References to all result groups available for this structural analysis model.",
"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": "References to the IfcRelConnectsStructuralMembers relationship by which structural members can be associated to structural connections.",
"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": "Optionally defines a name for this connection condition.",
"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": {
"attributes": {
"PredefinedType": "Defines the load carrying behavior of the member, as far as it is taken into account in the analysis."
},
"description": "Defines the load carrying behavior of the member, as far as it is taken into account in the analysis.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralcurvemember.htm"
},
"IfcStructuralCurveMemberVarying": {
"description": "Definition from IAI: Instances of the entity IfcStructuralCurveMemberVarying shall be used to describe linear structural elements with varying profile properties.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralcurvemembervarying.htm"
},
"IfcStructuralItem": {
"attributes": {
"AssignedStructuralActivity": "Inverse relationship to all structural activities (i.e. to actions or reactions) which are assigned to this structural member."
},
"description": "Inverse relationship to all structural activities (i.e. to actions or reactions) which are assigned to this structural member.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralitem.htm"
},
"IfcStructuralLinearAction": {
"attributes": {
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructurallinearaction.htm"
},
"IfcStructuralLinearActionVarying": {
"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.",
"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)"
},
"description": "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)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructurallinearactionvarying.htm"
},
"IfcStructuralLoad": {
"attributes": {
"Name": "Optionally defines a name for this load."
},
"description": "Optionally defines a name for this load.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralload.htm"
},
"IfcStructuralLoadGroup": {
"attributes": {
"ActionSource": "Source of actions in the group. Normally needed if 'PredefinedType' specifies a LOAD_CASE.",
"ActionType": "Type of actions in the group. Normally needed if 'PredefinedType' specifies a LOAD_COMBINATION_GROUP.",
"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.",
"LoadGroupFor": "Analysis models in which this load group is used.",
"PredefinedType": "Selects a predefined type for the load group. It can be differentiated between load groups, load cases, load combination groups (a necessary construct for the description of load combinations) and load combinations.",
"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.",
"SourceOfResultGroup": "Results which were computed using this load group."
},
"description": "Analysis models in which this load group is used.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralloadgroup.htm"
},
"IfcStructuralLoadLinearForce": {
"attributes": {
"LinearForceX": "Linear force value in x-direction.",
"LinearForceY": "Linear force value in y-direction.",
"LinearForceZ": "Linear force value in z-direction.",
"LinearMomentX": "Linear moment about the x-axis.",
"LinearMomentY": "Linear moment about the y-axis.",
"LinearMomentZ": "Linear moment about the z-axis."
},
"description": "Linear moment about the z-axis.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadlinearforce.htm"
},
"IfcStructuralLoadPlanarForce": {
"attributes": {
"PlanarForceX": "Planar force value in x-direction.",
"PlanarForceY": "Planar force value in y-direction.",
"PlanarForceZ": "Planar force value in z-direction."
},
"description": "Planar force value in z-direction.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadplanarforce.htm"
},
"IfcStructuralLoadSingleDisplacement": {
"attributes": {
"DisplacementX": "Displacement in x-direction.",
"DisplacementY": "Displacement in y-direction.",
"DisplacementZ": "Displacement in z-direction.",
"RotationalDisplacementRX": "Rotation about the x-axis.",
"RotationalDisplacementRY": "Rotation about the y-axis.",
"RotationalDisplacementRZ": "Rotation about the z-axis."
},
"description": "Rotation about the z-axis.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadsingledisplacement.htm"
},
"IfcStructuralLoadSingleDisplacementDistortion": {
"attributes": {
"Distortion": "The distortion curvature given to the displacement load."
},
"description": "The distortion curvature given to the displacement load.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadsingledisplacementdistortion.htm"
},
"IfcStructuralLoadSingleForce": {
"attributes": {
"ForceX": "Force value in x-direction.",
"ForceY": "Force value in y-direction.",
"ForceZ": "Force value in z-direction.",
"MomentX": "Moment about the x-axis.",
"MomentY": "Moment about the y-axis.",
"MomentZ": "Moment about the z-axis."
},
"description": "Moment about the z-axis.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadsingleforce.htm"
},
"IfcStructuralLoadSingleForceWarping": {
"attributes": {
"WarpingMoment": "The warping moment at the point load."
},
"description": "The warping moment at the point load.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadsingleforcewarping.htm"
},
"IfcStructuralLoadStatic": {
"description": "The abstract entity IfcStructuralLoadStatic is the supertype of all static loads (actions or reactions) which can be defined.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadstatic.htm"
},
"IfcStructuralLoadTemperature": {
"attributes": {
"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.",
"DeltaT_Z": "Temperature change which is applied to the outer fiber of the positive Z-direction. A positive value describes an increase in temperature."
},
"description": "Temperature change which is applied to the outer fiber of the positive Z-direction. A positive value describes an increase in temperature.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralloadresource/lexical/ifcstructuralloadtemperature.htm"
},
"IfcStructuralMember": {
"attributes": {
"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)."
},
"description": "Inverse relationship to all structural connections (i.e. to supports or connecting elements) which are defined for this structural member.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralmember.htm"
},
"IfcStructuralPlanarAction": {
"attributes": {
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralplanaraction.htm"
},
"IfcStructuralPlanarActionVarying": {
"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.",
"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)"
},
"description": "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)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralplanaractionvarying.htm"
},
"IfcStructuralPointAction": {
"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).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralpointaction.htm"
},
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralpointconnection.htm"
},
"IfcStructuralPointReaction": {
"description": "Instances of the entity IfcStructuralPointReaction are used to define point reactions. IfcStructuralPointReaction inherits all needed attributes from its superclass IfcStructuralReaction.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralpointreaction.htm"
},
"IfcStructuralProfileProperties": {
"attributes": {
"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_. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute <i>CentreOfGravityInX</i> is a new attribute. </font></small>",
"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_. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute <i>CentreOfGravityInY</i> is a new attribute. </font></small>",
"MaximumSectionModulusY": "Bending resistance about Y-axis of profile coordinate system at maximum Z-ordinate. Usually measured in [mm3].",
"MaximumSectionModulusZ": "Bending resistance about Z-axis of profile coordinate system at maximum Y-ordinate. Usually measured in [mm3].",
"MinimumSectionModulusY": "Bending resistance about Y-axis of profile coordinate system at minimum Z-ordinate. Usually measured in [mm3].",
"MinimumSectionModulusZ": "Bending resistance about Z-axis of profile coordinate system at minimum Y-ordinate. Usually measured in [mm3].",
"MomentOfInertiaY": "Moment of inertia about Y-axis of profile coordinate system. Usually measured in [mm4].",
"MomentOfInertiaYZ": "Moment of inertia about Y and Z-axes of profile coordinate system. Usually measured in [mm4].",
"MomentOfInertiaZ": "Moment of inertia about Z-axis of profile coordinate system. Usually measured in [mm4].",
"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_.",
"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_.",
"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].",
"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].",
"TorsionalConstantX": "Torsional constant about X-axis of profile coordinate system. Usually measured in [mm4].",
"TorsionalSectionModulus": "Torsional resistance (about the profiles X-axis). Usually measured in [mm3].",
"WarpingConstant": "Warping constant of the profile for torsional action. Usually measured in [mm6]."
},
"description": "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_. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute <i>CentreOfGravityInY</i> is a new attribute. </font></small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofilepropertyresource/lexical/ifcstructuralprofileproperties.htm"
},
"IfcStructuralReaction": {
"attributes": {
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralreaction.htm"
},
"IfcStructuralResultGroup": {
"attributes": {
"IsLinear": "This Boolean value allows to easily recognize if a linear analysis has been applied (allowing the superposition of analysis results), or vice versa.",
"ResultForLoadGroup": "Reference to an instance of IfcStructuralLoadGroup for which this instance represents the result.",
"ResultGroupFor": "Reference to an instance of IfcStructuralAnalysisModel for which this instance captures a result.",
"TheoryType": "Specifies the analysis theory used to obtain the respective results."
},
"description": "Reference to an instance of IfcStructuralAnalysisModel for which this instance captures a result.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralresultgroup.htm"
},
"IfcStructuralSteelProfileProperties": {
"attributes": {
"PlasticShapeFactorY": "Ratio of plastic versus elastic bending moment capacity (about y-axis) of the profile.",
"PlasticShapeFactorZ": "Ratio of plastic versus elastic bending moment capacity (about z-axis) of the profile.",
"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].",
"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]."
},
"description": "Ratio of plastic versus elastic bending moment capacity (about z-axis) of the profile.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofilepropertyresource/lexical/ifcstructuralsteelprofileproperties.htm"
},
"IfcStructuralSurfaceConnection": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralsurfaceconnection.htm"
},
"IfcStructuralSurfaceMember": {
"attributes": {
"PredefinedType": "Defines the load carrying behavior of the member, as far as it is taken into account in the analysis.",
"Thickness": "Defines the typically understood thickness of the structural face member, i.e. the smallest spatial dimension of the element."
},
"description": "Defines the typically understood thickness of the structural face member, i.e. the smallest spatial dimension of the element.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralsurfacemember.htm"
},
"IfcStructuralSurfaceMemberVarying": {
"attributes": {
"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.",
"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)",
"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."
},
"description": "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)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcstructuralanalysisdomain/lexical/ifcstructuralsurfacemembervarying.htm"
},
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationdimensioningresource/lexical/ifcstructureddimensioncallout.htm"
},
"IfcStyleModel": {
"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. ",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcstylemodel.htm"
},
"IfcStyledItem": {
"attributes": {
"Item": "A geometric representation item to which the style is assigned. > <font size=\"-1\" color=\"#0000ff\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>Item</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font>",
"Name": "The word, or group of words, by which the styled item is referred to.",
"Styles": "Representation style assignments which are assigned to an item. NOTE: In current IFC release only one presentation style assignment shall be assigned."
},
"description": "The word, or group of words, by which the styled item is referred to.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcstyleditem.htm"
},
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcstyledrepresentation.htm"
},
"IfcSubContractResource": {
"attributes": {
"JobDescription": "The description of the jobs that this subcontract should complete.",
"SubContractor": "The actor performing the role of the subcontracted resource."
},
"description": "The description of the jobs that this subcontract should complete.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcconstructionmgmtdomain/lexical/ifcsubcontractresource.htm"
},
"IfcSubedge": {
"attributes": {
"ParentEdge": "The Edge, or Subedge, which contains the Subedge."
},
"description": "The Edge, or Subedge, which contains the Subedge.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcsubedge.htm"
},
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcsurface.htm"
},
"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": "The surface containing the Directrix.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricmodelresource/lexical/ifcsurfacecurvesweptareasolid.htm"
},
"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": "The extrusion axis defined as vector. IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector (ExtrudedDirection, Depth)",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcsurfaceoflinearextrusion.htm"
},
"IfcSurfaceOfRevolution": {
"attributes": {
"AxisLine": "The line coinciding with the axis of revolution. IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcCurve() || IfcLine(AxisPosition.Location, IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector(AxisPosition.Z,1.0))",
"AxisPosition": "A point on the axis of revolution and the direction of the axis of revolution."
},
"description": "The line coinciding with the axis of revolution. IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcCurve() || IfcLine(AxisPosition.Location, IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector(AxisPosition.Z,1.0))",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcsurfaceofrevolution.htm"
},
"IfcSurfaceStyle": {
"attributes": {
"Side": "An indication of which side of the surface to apply the style.",
"Styles": "A collection of different surface styles."
},
"description": "A collection of different surface styles.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacestyle.htm"
},
"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. > <small>The factor can be measured physically and has three ratios for the red, green and blue part of the light. </small>",
"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. > <small>The factor can be measured physically and has three ratios for the red, green and blue part of the light. </small>",
"ReflectanceColour": "A coefficient that determines the extent that the light falling onto a surface is fully or partially reflected. > <small>The factor can be measured physically and has three ratios for the red, green and blue part of the light. </small>",
"TransmissionColour": "Describes how the light falling on a body is totally or partially transmitted. > <small>The factor can be measured physically and has three ratios for the red, green and blue part of the light. </small>"
},
"description": "A coefficient that determines the extent that the light falling onto a surface is fully or partially reflected. > <small>The factor can be measured physically and has three ratios for the red, green and blue part of the light. </small>",
"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"
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacestylerefraction.htm"
},
"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.",
"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.",
"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.",
"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.",
"SpecularHighlight": "The exponent or roughness part of the specular reflectance.",
"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.",
"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."
},
"description": "Identifies the predefined types of reflectance method from which the method required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacestylerendering.htm"
},
"IfcSurfaceStyleShading": {
"attributes": {
"SurfaceColour": "The colour used to render the surface. The surface colour for visualisation is defined by specifying the intensity of red, green and blue."
},
"description": "The colour used to render the surface. The surface colour for visualisation is defined by specifying the intensity of red, green and blue.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacestyleshading.htm"
},
"IfcSurfaceStyleWithTextures": {
"attributes": {
"Textures": "The textures applied to the surface. Only one image map with the same image map type shall be applied."
},
"description": "The textures applied to the surface. Only one image map with the same image map type shall be applied.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacestylewithtextures.htm"
},
"IfcSurfaceTexture": {
"attributes": {
"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.",
"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.",
"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.",
"TextureType": "Identifies the predefined types of image map from which the type required may be set."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifcsurfacetexture.htm"
},
"IfcSweptAreaSolid": {
"attributes": {
"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."
},
"description": "Position coordinate system for the swept area.",
"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": "The parameter value on the directrix at which the sweeping operation ends.",
"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": "The space dimensionality of this class, derived from the dimensionality of the Position. Position.Dim",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifcsweptsurface.htm"
},
"IfcSwitchingDeviceType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of switch from which the type required may be set."
},
"description": "Identifies the predefined types of switch from which the type required may be set.",
"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": "The style applied to the symbol for its visual appearance.",
"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": "Reference to the ~~building~~ spatial structure via the objectified relationship _IfcRelServicesBuildings_, which is serviced by the system.",
"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.",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInX</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"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": "Location of centre of gravity along the x axis measured from the center of the bounding box. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInX</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"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": "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)))",
"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": "Reference to the IfcTable, in which the IfcTableRow is defined (or contained).",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcutilityresource/lexical/ifctablerow.htm"
},
"IfcTankType": {
"attributes": {
"PredefinedType": "Defines the type of tank."
},
"description": "Defines the type of tank.",
"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": "A value that indicates the relative priority of the task (in comparison to the priorities of other tasks).",
"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. > <font size=\"-1\">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. </font>"
},
"description": "The world wide web address at which the preliminary page of information for the person or organization can be located. > <font size=\"-1\">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. </font>",
"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.",
"PredefinedType": "Predefined generic types for a tendon.",
"TensionForce": "The maximum allowed tension force that can be applied on the tendon."
},
"description": "The smallest curvature radius calculated on the whole effective length of the tendon where the tension properties are still valid.",
"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.",
"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": "The curve being annotated by the terminator symbol.",
"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. > <small>When used with a text style based on <i>IfcTextStyleWithBoxCharacteristics</i> then the y-axis is taken as the reference direction for the box rotation angle and the box slant angle. </small>"
},
"description": "The writing direction of the text literal.",
"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": "The alignment of the text literal relative to its position.",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>TextFontStyle</i> is a new attribute attached to <i>IfcTextStyle</i>. </font></small>",
"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_. > <small><font color=\"#0000ff\"> IFC2x Edition 3 CHANGE&nbsp; The <i>attribute <i>TextBlockStyle</i> has been changed from SET[1:?] to a non-aggregated optional, it has been renamed from TextStyles. </i></font></small>"
},
"description": "The style applied to the text font for its visual appearance. It defines the font family, font style, weight and size. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>TextFontStyle</i> is a new attribute attached to <i>IfcTextStyle</i>. </font></small>",
"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.",
"FontSize": "The font size provides the size or height of the text font. > <small>NOTE&nbsp; The following values are allowed, <<i>IfcLengthMeasure<i>, with positive values, the length unit is globally defined at <i>IfcUnitAssignment</i>.</i></i></small>",
"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. > <small>NOTE&nbsp; It has been introduced for later compliance to full CSS1 support.</small>",
"FontWeight": "The font weight property selects the weight of the font. > <small>NOTE&nbsp; Values other then 'normal' and 'bold' have been introduced for later compliance to full CSS1 support.</small>"
},
"description": "The font size provides the size or height of the text font. > <small>NOTE&nbsp; The following values are allowed, <<i>IfcLengthMeasure<i>, with positive values, the length unit is globally defined at <i>IfcUnitAssignment</i>.</i></i></small>",
"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": "This property sets the background color of an element.",
"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). > <small>NOTE&nbsp; The following values are allowed, <i>IfcDescriptiveMeasure</i> with value='normal', or <i>IfcLengthMeasure<i>, the length unit is globally defined at <i>IfcUnitAssignment</i>.</i></i></small>",
"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. > <small>NOTE&nbsp; The following values are allowed:<br> <i>IfcDescriptiveMeasure</i> with value='normal', or <br> <i>IfcLengthMeasure<i>, with non-negative values, the length unit is globally defined at <i>IfcUnitAssignment</i>, or <br><i>IfcRatioMeasure</i>.</i></i></small>",
"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. > <small>NOTE&nbsp; It has been introduced for later compliance to full CSS1 support.</small>",
"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. > <small>NOTE&nbsp; It has been introduced for later compliance to full CSS1 support.</small>",
"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). > <small>NOTE&nbsp; It has been introduced for later compliance to full CSS1 support.</small>"
},
"description": "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. > <small>NOTE&nbsp; The following values are allowed:<br> <i>IfcDescriptiveMeasure</i> with value='normal', or <br> <i>IfcLengthMeasure<i>, with non-negative values, the length unit is globally defined at <i>IfcUnitAssignment</i>, or <br><i>IfcRatioMeasure</i>.</i></i></small>",
"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": "The distance between the character boxes of adjacent characters.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifctextstylewithboxcharacteristics.htm"
},
"IfcTextureCoordinate": {
"attributes": {
"AnnotatedSurface": ""
},
"description": "",
"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": "The parameter used by the function as specified by Mode.",
"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": "Reference to a list of texture vertex assignment to coordinates within a vertex based geometry.",
"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": "The first coordinate[1] is the S, the second coordinate[2] is the T parameter value.",
"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": "The rate at which thermal energy is transmitted through the material.Usually in [W/m K].",
"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": "",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctimeseriesresource/lexical/ifctimeseries.htm"
},
"IfcTimeSeriesReferenceRelationship": {
"attributes": {
"ReferencedTimeSeries": "",
"TimeSeriesReferences": ""
},
"description": "",
"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. > <font color=\"#FF0000\" size=\"-1\">IFC2x2 Addendum 1 change: The attribute has been changed to be optional </font>",
"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 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.",
"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 list of time-series values. At least one value is required.",
"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:",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifctopologyrepresentation.htm"
},
"IfcTransformerType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of transformer from which the type required may be set."
},
"description": "Identifies the predefined types of transformer from which the type required may be set.",
"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": "Capacity of the transportation element measured in numbers of person.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifctransportelement.htm"
},
"IfcTransportElementType": {
"attributes": {
"PredefinedType": "Predefined types to define the particular type of the transport element. There may be property set definitions available for each predefined type."
},
"description": "Predefined types to define the particular type of the transport element. There may be property set definitions available for each predefined type.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifctransportelementtype.htm"
},
"IfcTrapeziumProfileDef": {
"attributes": {
"BottomXDim": "The extent of the bottom line measured along the implicit x-axis.",
"TopXDim": "The extent of the top line measured along the implicit x-axis.",
"TopXOffset": "Offset from the beginning of the top line to the bottom line, measured along the implicit x-axis.",
"YDim": "The extent of the distance between the parallel bottom and top lines measured along the implicit y-axis."
},
"description": "Offset from the beginning of the top line to the bottom line, measured along the implicit x-axis.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifctrapeziumprofiledef.htm"
},
"IfcTrimmedCurve": {
"attributes": {
"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.",
"MasterRepresentation": "Where both parameter and point are present at either end of the curve this indicates the preferred form.",
"SenseAgreement": "Flag to indicate whether the direction of the trimmed curve agrees with or is opposed to the direction of the basis curve.",
"Trim1": "The first trimming point which may be specified as a Cartesian point, as a real parameter or both.",
"Trim2": "The second trimming point which may be specified as a Cartesian point, as a real parameter or both."
},
"description": "Where both parameter and point are present at either end of the curve this indicates the preferred form.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometryresource/lexical/ifctrimmedcurve.htm"
},
"IfcTubeBundleType": {
"attributes": {
"PredefinedType": "Defines the type of tube bundle."
},
"description": "Defines the type of tube bundle.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifctubebundletype.htm"
},
"IfcTwoDirectionRepeatFactor": {
"attributes": {
"SecondRepeatFactor": "A vector which specifies the relative positioning of tiles in the second direction."
},
"description": "A vector which specifies the relative positioning of tiles in the second direction.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcpresentationappearanceresource/lexical/ifctwodirectionrepeatfactor.htm"
},
"IfcTypeObject": {
"attributes": {
"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.",
"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. > <small><font color=\"#ff0000\"> IFC2x Edition 3 CHANGE&nbsp; The attribute aggregate type has been changed from LIST to SET. </font></small>",
"ObjectTypeOf": "Reference to the relationship IfcRelDefinedByType and thus to those occurrence objects, which are defined by this type."
},
"description": "Reference to the relationship IfcRelDefinedByType and thus to those occurrence objects, which are defined by this type.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifctypeobject.htm"
},
"IfcTypeProduct": {
"attributes": {
"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.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifckernel/lexical/ifctypeproduct.htm"
},
"IfcUShapeProfileDef": {
"attributes": {
"CentreOfGravityInX": "Location of centre of gravity along the x axis measured from the center of the bounding box. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInX</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"Depth": "Web lengths, 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.",
"FlangeSlope": "Slope of flange 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).",
"WebThickness": "Constant wall thickness of web (= ts)."
},
"description": "Location of centre of gravity along the x axis measured from the center of the bounding box. > <small><font color=\"#ff0000\"> IFC2x Edition 2 Addendum 2 CHANGE The attribute <i>CentreOfGravityInX</i> has been made optional. Upward compatibility for file based exchange is guaranteed. </font></small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifcushapeprofiledef.htm"
},
"IfcUnitAssignment": {
"attributes": {
"Units": "Units to be included within a unit assignment."
},
"description": "Units to be included within a unit assignment.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmeasureresource/lexical/ifcunitassignment.htm"
},
"IfcUnitaryEquipmentType": {
"attributes": {
"PredefinedType": "The type of unitary equipment."
},
"description": "The type of unitary equipment.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifchvacdomain/lexical/ifcunitaryequipmenttype.htm"
},
"IfcValveType": {
"attributes": {
"PredefinedType": "The type of valve."
},
"description": "The type of valve.",
"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": "The space dimensionality of this class, it is derived from Orientation Orientation.Dim",
"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.",
"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": "Reference to a list of polyloop's defining a face bound of a face within a vertex based geometry.",
"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": "The vertex which defines the entire loop.",
"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": "The geometric point, which defines the position in geometric space of the vertex.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifctopologyresource/lexical/ifcvertexpoint.htm"
},
"IfcVibrationIsolatorType": {
"attributes": {
"PredefinedType": "Defines the type of vibration isolator."
},
"description": "Defines the type of vibration isolator.",
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcvirtualelement.htm"
},
"IfcVirtualGridIntersection": {
"attributes": {
"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.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcgeometricconstraintresource/lexical/ifcvirtualgridintersection.htm"
},
"IfcWall": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwall.htm"
},
"IfcWallStandardCase": {
"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 ",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwallstandardcase.htm"
},
"IfcWallType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of a wall element from which the type required may be set."
},
"description": "Identifies the predefined types of a wall element from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwalltype.htm"
},
"IfcWasteTerminalType": {
"attributes": {
"PredefinedType": "Identifies the predefined types of waste terminal from which the type required may be set."
},
"description": "Identifies the predefined types of waste terminal from which the type required may be set.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcplumbingfireprotectiondomain/lexical/ifcwasteterminaltype.htm"
},
"IfcWaterProperties": {
"attributes": {
"AcidityConcentration": "Maximum CaCO~3~ equivalent that would neutralize the acid.",
"AlkalinityConcentration": "Maximum alkalinity concentration (maximum sum of concentrations of each of the negative ions substances measured as CaCO~3~).",
"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.",
"Hardness": "Water hardness as positive, multivalent ion concentration in the water (usually concentrations of calcium and magnesium ions in terms of calcium carbonate).",
"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.",
"IsPotable": "If TRUE, then the water is considered potable.",
"PHLevel": "Maximum water ph in a range from 0-14."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcmaterialpropertyresource/lexical/ifcwaterproperties.htm"
},
"IfcWindow": {
"attributes": {
"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. > <small> NOTE&nbsp; 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 <i>OverallHeight</i> shall still be given as the window opening height, and not as the total height of the window lining.</small>",
"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. > <small> NOTE&nbsp; 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 <i>OverallWidth</i> shall still be given as the window opening width, and not as the total width of the window lining.</small>"
},
"description": "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. > <small> NOTE&nbsp; 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 <i>OverallWidth</i> shall still be given as the window opening width, and not as the total width of the window lining.</small>",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwindow.htm"
},
"IfcWindowLiningProperties": {
"attributes": {
"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.",
"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.",
"LiningDepth": "Depth of the window lining (dimension measured perpendicular to window elevation plane).",
"LiningThickness": "Thickness of the window lining (measured parallel to the window elevation plane).",
"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.",
"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.",
"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.",
"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.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwindowliningproperties.htm"
},
"IfcWindowPanelProperties": {
"attributes": {
"FrameDepth": "Depth of panel frame, measured from front face to back face horizontally (i.e. perpendicular to the window (elevation) plane.",
"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.",
"OperationType": "Types of window panel operations. Also used to assign standard symbolic presentations according to national building standards.",
"PanelPosition": "Position of this panel within the overall window style.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwindowpanelproperties.htm"
},
"IfcWindowStyle": {
"attributes": {
"ConstructionType": "Type defining the basic construction and material type of the window.",
"OperationType": "Type defining the general layout and operation of the window style.",
"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.",
"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."
},
"description": "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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcsharedbldgelements/lexical/ifcwindowstyle.htm"
},
"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.",
"TotalFloat": "The total time float of the entire work schedule.",
"UserDefinedControlType": "A user defined work control type.",
"WorkControlType": "Predefined work control types from which that required may be set."
},
"description": "A user defined work control type.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprocessextension/lexical/ifcworkcontrol.htm"
},
"IfcWorkPlan": {
"description": "An IfcWorkPlan represents work plans in a construction or a facilities management project.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprocessextension/lexical/ifcworkplan.htm"
},
"IfcWorkSchedule": {
"description": "An IfcWorkSchedule represents a task schedule in a work plan, which in turn can contain a set of schedules for different purposes.",
"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)."
},
"description": "Edge radius according the above illustration (= r2). If it is not given, zero is assumed.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcprofileresource/lexical/ifczshapeprofiledef.htm"
},
"IfcZone": {
"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.",
"spec_url": "https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifczone.htm"
}
}
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