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<!-- edited with XMLSpy v2022 (x64) (http://www.altova.com) by Leon van Berlo (Overleaf Investments B.V.) -->
<!-- February 8, 2022 - DRAFT -->
<xs:schema xmlns:ids= "http://standards.buildingsmart.org/IDS" xmlns:xs= "http://www.w3.org/2001/XMLSchema" xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" targetNamespace= "http://standards.buildingsmart.org/IDS" elementFormDefault= "qualified" attributeFormDefault= "unqualified" version= "0.5.8" >
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<xs:import namespace= "http://www.w3.org/XML/1998/namespace" schemaLocation= "http://www.w3.org/2001/xml.xsd" />
<xs:import namespace= "http://www.w3.org/2001/XMLSchema" schemaLocation= "https://www.w3.org/2001/XMLSchema.xsd" />
<xs:import namespace= "http://www.w3.org/2001/XMLSchema-instance" schemaLocation= "http://www.w3.org/2001/XMLSchema-instance" />
<xs:element name= "ids" >
<xs:complexType >
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<xs:sequence >
<xs:element name= "info" >
<xs:complexType >
<xs:sequence >
<xs:element name= "title" type= "xs:string" />
<xs:element name= "copyright" type= "xs:string" minOccurs= "0" />
<xs:element name= "version" type= "xs:string" minOccurs= "0" />
<xs:element name= "description" type= "xs:string" minOccurs= "0" />
<xs:element name= "author" minOccurs= "0" >
<xs:simpleType >
<xs:restriction base= "xs:string" >
<xs:pattern value= "[^@]+@[^\.]+\..+" />
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name= "date" type= "xs:date" minOccurs= "0" />
<xs:element name= "purpose" type= "xs:string" minOccurs= "0" />
<xs:element name= "milestone" type= "xs:string" minOccurs= "0" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name= "specifications" >
<xs:complexType >
<xs:complexContent >
<xs:extension base= "ids:specificationsType" />
</xs:complexContent>
</xs:complexType>
</xs:element>
</xs:sequence>
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</xs:complexType>
</xs:element>
<xs:complexType name= "entityType" >
<xs:sequence >
<xs:element name= "name" type= "ids:idsValue" />
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<xs:element name= "predefinedType" type= "ids:idsValue" minOccurs= "0" />
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</xs:sequence>
</xs:complexType>
<xs:complexType name= "idsValue" >
<xs:choice minOccurs= "1" >
<!-- place for potential additional rules for idsValue -->
<xs:element name= "simpleValue" type= "xs:string" minOccurs= "1" maxOccurs= "1" />
<xs:element ref= "xs:restriction" minOccurs= "1" maxOccurs= "unbounded" />
</xs:choice>
</xs:complexType>
<xs:complexType name= "classificationType" >
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<xs:sequence >
<xs:element name= "value" type= "ids:idsValue" minOccurs= "0" />
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<xs:element name= "system" type= "ids:idsValue" minOccurs= "0" />
</xs:sequence>
<xs:attribute name= "location" use= "required" >
<xs:simpleType >
<xs:restriction base= "xs:string" >
<xs:enumeration value= "type" />
<xs:enumeration value= "instance" />
<xs:enumeration value= "any" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
<xs:complexType name= "applicabilityType" >
<xs:sequence >
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<xs:element name= "entity" type= "ids:entityType" minOccurs= "0" />
<xs:element name= "classification" type= "ids:classificationType" minOccurs= "0" maxOccurs= "unbounded" />
<xs:element name= "attribute" type= "ids:attributeType" minOccurs= "0" maxOccurs= "unbounded" />
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<xs:element name= "property" minOccurs= "0" maxOccurs= "unbounded" >
<xs:complexType >
<xs:complexContent >
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<xs:extension base= "ids:propertyType" >
<xs:attribute name= "measure" >
<xs:annotation >
<xs:documentation > See the documentation and default units of these measures on https://github.com/buildingSMART/IDS/wiki/Physical-Quantities-and-Units</xs:documentation>
</xs:annotation>
<xs:simpleType >
<xs:restriction base= "xs:string" >
<xs:enumeration value= "String" />
<xs:enumeration value= "Number" />
<xs:enumeration value= "AmountOfSubstance" />
<xs:enumeration value= "AreaDensity" />
<xs:enumeration value= "Area" />
<xs:enumeration value= "DynamicViscosity" />
<xs:enumeration value= "ElectricCapacitance" />
<xs:enumeration value= "ElectricCharge" />
<xs:enumeration value= "ElectricConductance" />
<xs:enumeration value= "ElectricCurrent" />
<xs:enumeration value= "ElectricResistance" />
<xs:enumeration value= "ElectricVoltage" />
<xs:enumeration value= "Energy" />
<xs:enumeration value= "Force" />
<xs:enumeration value= "Frequency" />
<xs:enumeration value= "HeatFluxDensity" />
<xs:enumeration value= "Heating" />
<xs:enumeration value= "Illuminance" />
<xs:enumeration value= "IonConcentration" />
<xs:enumeration value= "IsoThermalMoistureCapacity" />
<xs:enumeration value= "Length" />
<xs:enumeration value= "Speed" />
<xs:enumeration value= "LuminousFlux" />
<xs:enumeration value= "LuminousIntensity" />
<xs:enumeration value= "MassDensity" />
<xs:enumeration value= "MassFlowRate" />
<xs:enumeration value= "Mass" />
<xs:enumeration value= "MassPerLength" />
<xs:enumeration value= "ModulusOfElasticity" />
<xs:enumeration value= "MoistureDiffusivity" />
<xs:enumeration value= "MolecularWeight" />
<xs:enumeration value= "MomentOfInertia" />
<xs:enumeration value= "PH" />
<xs:enumeration value= "PlanarForce" />
<xs:enumeration value= "Angle" />
<xs:enumeration value= "PlaneAngle" />
<xs:enumeration value= "Power" />
<xs:enumeration value= "Pressure" />
<xs:enumeration value= "RadioActivity" />
<xs:enumeration value= "Ratio" />
<xs:enumeration value= "RotationalFrequency" />
<xs:enumeration value= "SectionModulus" />
<xs:enumeration value= "SoundPower" />
<xs:enumeration value= "SoundPressure" />
<xs:enumeration value= "SpecificHeatCapacity" />
<xs:enumeration value= "TemperatureRateOfChange" />
<xs:enumeration value= "ThermalConductivity" />
<xs:enumeration value= "Temperature" />
<xs:enumeration value= "Time" />
<xs:enumeration value= "Torque" />
<xs:enumeration value= "VaporPermeability" />
<xs:enumeration value= "Volume" />
<xs:enumeration value= "VolumetricFlowRate" />
<!-- kind of number defined in base of restriction -->
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
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</xs:complexContent>
</xs:complexType>
</xs:element>
<xs:element name= "material" minOccurs= "0" >
<xs:complexType >
<xs:complexContent >
<xs:extension base= "ids:materialType" />
</xs:complexContent>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name= "systemType" >
<xs:simpleContent >
<xs:extension base= "xs:string" >
<xs:attribute name= "href" type= "xs:anyURI" use= "optional" />
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name= "propertyType" >
<xs:sequence >
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<xs:element name= "propertySet" type= "ids:idsValue" />
<xs:element name= "name" type= "ids:idsValue" />
<xs:element name= "value" type= "ids:idsValue" minOccurs= "0" />
</xs:sequence>
<xs:attribute name= "location" use= "required" >
<xs:simpleType >
<xs:restriction base= "xs:string" >
<xs:enumeration value= "type" />
<xs:enumeration value= "instance" />
<xs:enumeration value= "any" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
<xs:complexType name= "attributeType" >
<xs:sequence >
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<xs:element name= "name" type= "ids:idsValue" />
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<xs:element name= "value" type= "ids:idsValue" minOccurs= "0" />
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</xs:sequence>
<xs:attribute name= "location" use= "required" >
<xs:simpleType >
<xs:restriction base= "xs:string" >
<xs:enumeration value= "type" />
<xs:enumeration value= "instance" />
<xs:enumeration value= "any" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
<xs:complexType name= "materialType" >
<xs:sequence >
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<xs:element name= "value" type= "ids:idsValue" minOccurs= "0" />
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</xs:sequence>
<xs:attribute name= "location" use= "required" >
<xs:simpleType >
<xs:restriction base= "xs:string" >
<xs:enumeration value= "type" />
<xs:enumeration value= "instance" />
<xs:enumeration value= "any" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
<xs:complexType name= "requirementsType" >
<xs:sequence maxOccurs= "unbounded" >
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<xs:element name= "entity" minOccurs= "0" >
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<xs:annotation >
<xs:documentation > Make sure 'Name' value of requirements entity is the same as the 'applicability' node, or a wildcard (inclusive pattern).</xs:documentation>
</xs:annotation>
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<xs:complexType >
<xs:complexContent >
<xs:extension base= "ids:entityType" >
<xs:attribute name= "instructions" >
<xs:annotation >
<xs:documentation > Author of the IDS can leave instructions for the authors of the IFC. This text could/should be displayed in the BIM/IFC authoring tool.</xs:documentation>
</xs:annotation>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>
<xs:element name= "partOf" minOccurs= "0" maxOccurs= "unbounded" >
<xs:complexType >
<xs:attribute name= "entity" use= "required" >
<xs:simpleType >
<xs:restriction base= "xs:string" >
<xs:enumeration value= "IfcElementAssembly" />
<xs:enumeration value= "IfcGroup" />
<xs:enumeration value= "IfcSystem" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
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</xs:element>
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<xs:element name= "classification" minOccurs= "0" maxOccurs= "unbounded" >
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<xs:complexType >
<xs:complexContent >
<xs:extension base= "ids:classificationType" >
<xs:attribute name= "uri" type= "xs:anyURI" use= "optional" />
<xs:attribute name= "use" use= "optional" >
<xs:simpleType >
<xs:restriction base= "xs:string" >
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<xs:enumeration value= "optional" />
<xs:enumeration value= "prohibited" />
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<xs:enumeration value= "required" />
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</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name= "instructions" >
<xs:annotation >
<xs:documentation > Author of the IDS can leave instructions for the authors of the IFC. This text could/should be displayed in the BIM/IFC authoring tool.</xs:documentation>
</xs:annotation>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>
<xs:element name= "attribute" minOccurs= "0" maxOccurs= "unbounded" >
<xs:complexType >
<xs:complexContent >
<xs:extension base= "ids:attributeType" >
<xs:attribute name= "use" use= "optional" >
<xs:simpleType >
<xs:restriction base= "xs:string" >
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<xs:enumeration value= "optional" />
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<xs:enumeration value= "prohibited" />
<xs:enumeration value= "required" />
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</xs:restriction>
</xs:simpleType>
</xs:attribute>
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<xs:attribute name= "instructions" >
<xs:annotation >
<xs:documentation > Author of the IDS can leave instructions for the authors of the IFC. This text could/should be displayed in the BIM/IFC authoring tool.</xs:documentation>
</xs:annotation>
</xs:attribute>
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</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>
<xs:element name= "property" minOccurs= "0" maxOccurs= "unbounded" >
<xs:complexType >
<xs:complexContent >
<xs:extension base= "ids:propertyType" >
<xs:attribute name= "uri" type= "xs:anyURI" use= "optional" />
<xs:attribute name= "use" use= "optional" >
<xs:simpleType >
<xs:restriction base= "xs:string" >
<xs:enumeration value= "optional" />
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<xs:enumeration value= "prohibited" />
<xs:enumeration value= "required" />
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</xs:restriction>
</xs:simpleType>
</xs:attribute>
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<xs:attribute name= "measure" >
<xs:annotation >
<xs:documentation > See the documentation and default units of these measures on https://github.com/buildingSMART/IDS/wiki/Physical-Quantities-and-Units</xs:documentation>
</xs:annotation>
<xs:simpleType >
<xs:restriction base= "xs:string" >
<xs:enumeration value= "String" />
<xs:enumeration value= "Number" />
<xs:enumeration value= "AmountOfSubstance" />
<xs:enumeration value= "AreaDensity" />
<xs:enumeration value= "Area" />
<xs:enumeration value= "DynamicViscosity" />
<xs:enumeration value= "ElectricCapacitance" />
<xs:enumeration value= "ElectricCharge" />
<xs:enumeration value= "ElectricConductance" />
<xs:enumeration value= "ElectricCurrent" />
<xs:enumeration value= "ElectricResistance" />
<xs:enumeration value= "ElectricVoltage" />
<xs:enumeration value= "Energy" />
<xs:enumeration value= "Force" />
<xs:enumeration value= "Frequency" />
<xs:enumeration value= "HeatFluxDensity" />
<xs:enumeration value= "Heating" />
<xs:enumeration value= "Illuminance" />
<xs:enumeration value= "IonConcentration" />
<xs:enumeration value= "IsoThermalMoistureCapacity" />
<xs:enumeration value= "Length" />
<xs:enumeration value= "Speed" />
<xs:enumeration value= "LuminousFlux" />
<xs:enumeration value= "LuminousIntensity" />
<xs:enumeration value= "MassDensity" />
<xs:enumeration value= "MassFlowRate" />
<xs:enumeration value= "Mass" />
<xs:enumeration value= "MassPerLength" />
<xs:enumeration value= "ModulusOfElasticity" />
<xs:enumeration value= "MoistureDiffusivity" />
<xs:enumeration value= "MolecularWeight" />
<xs:enumeration value= "MomentOfInertia" />
<xs:enumeration value= "PH" />
<xs:enumeration value= "PlanarForce" />
<xs:enumeration value= "Angle" />
<xs:enumeration value= "PlaneAngle" />
<xs:enumeration value= "Power" />
<xs:enumeration value= "Pressure" />
<xs:enumeration value= "RadioActivity" />
<xs:enumeration value= "Ratio" />
<xs:enumeration value= "RotationalFrequency" />
<xs:enumeration value= "SectionModulus" />
<xs:enumeration value= "SoundPower" />
<xs:enumeration value= "SoundPressure" />
<xs:enumeration value= "SpecificHeatCapacity" />
<xs:enumeration value= "TemperatureRateOfChange" />
<xs:enumeration value= "ThermalConductivity" />
<xs:enumeration value= "Temperature" />
<xs:enumeration value= "Time" />
<xs:enumeration value= "Torque" />
<xs:enumeration value= "VaporPermeability" />
<xs:enumeration value= "Volume" />
<xs:enumeration value= "VolumetricFlowRate" />
<!-- kind of number defined in base of restriction -->
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name= "instructions" >
<xs:annotation >
<xs:documentation > Author of the IDS can leave instructions for the authors of the IFC. This text could/should be displayed in the BIM/IFC authoring tool.</xs:documentation>
</xs:annotation>
</xs:attribute>
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</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>
<xs:element name= "material" minOccurs= "0" >
<xs:complexType >
<xs:complexContent >
<xs:extension base= "ids:materialType" >
<xs:attribute name= "uri" type= "xs:anyURI" use= "optional" />
<xs:attribute name= "use" use= "optional" >
<xs:simpleType >
<xs:restriction base= "xs:string" >
<xs:enumeration value= "optional" />
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<xs:enumeration value= "prohibited" />
<xs:enumeration value= "required" />
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</xs:restriction>
</xs:simpleType>
</xs:attribute>
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<xs:attribute name= "instructions" >
<xs:annotation >
<xs:documentation > Author of the IDS can leave instructions for the authors of the IFC. This text could/should be displayed in the BIM/IFC authoring tool.</xs:documentation>
</xs:annotation>
</xs:attribute>
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</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name= "specificationType" >
<xs:sequence >
<xs:element name= "applicability" type= "ids:applicabilityType" />
<xs:element name= "requirements" type= "ids:requirementsType" />
</xs:sequence>
<xs:attribute name= "name" type= "xs:string" use= "optional" />
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<xs:attribute name= "use" use= "required" >
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<xs:simpleType >
<xs:restriction base= "xs:string" >
<xs:enumeration value= "optional" />
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<xs:enumeration value= "prohibited" />
<xs:enumeration value= "required" />
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</xs:restriction>
</xs:simpleType>
</xs:attribute>
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<xs:attribute name= "ifcVersion" use= "required" >
<xs:simpleType >
<xs:list >
<xs:simpleType >
<xs:restriction base= "xs:string" >
<xs:enumeration value= "IFC2X3" />
<xs:enumeration value= "IFC4" />
<xs:enumeration value= "IFC4_3" />
</xs:restriction>
</xs:simpleType>
</xs:list>
</xs:simpleType>
</xs:attribute>
<xs:attribute name= "identifier" >
<xs:annotation >
<xs:documentation > Author of the IDS can provide an identifier to the IDS. Beware: this cannot be enforced/assumed as (global) unique.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name= "description" type= "xs:string" use= "optional" />
<xs:attribute name= "instructions" >
<xs:annotation >
<xs:documentation > Author of the IDS can leave instructions for the authors of the IFC. This text could/should be displayed in the BIM/IFC authoring tool.</xs:documentation>
</xs:annotation>
</xs:attribute>
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</xs:complexType>
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<xs:complexType name= "specificationsType" >
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<xs:sequence >
<xs:element name= "specification" type= "ids:specificationType" minOccurs= "1" maxOccurs= "unbounded" />
</xs:sequence>
</xs:complexType>
</xs:schema>
