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 | Property Reference Value |
| Item | SPF | XML | Change | Description | IFC2x3 to IFC4 4.0.0.0 |
|---|---|---|---|---|
| IfcPropertyReferenceValue | ||||
| UsageName | MODIFIED | Type changed from IfcLabel to IfcText. | ||
| PropertyReference | MODIFIED | Instantiation changed to OPTIONAL. | IFC4 Addendum 1 4.0.1.0 | |
| IfcPropertyReferenceValue | ||||
| HasConstraints | ADDED | |||
| HasApprovals | ADDED | IFC4X3_ADD2 to IFC4X4_draft | ||
| IfcPropertyReferenceValue | ||||
| PartOfMaterialOrProfileProperties | ADDED |
The IfcPropertyReferenceValue allows a property value to be of type of an resource level entity. The applicable entities that can be used as value references are given by the IfcObjectReferenceSelect.
HISTORY New entity in IFC1.5. Entity has been renamed from IfcObjectReference in IFC2x.
IFC4 CHANGE Attribute PropertyReference has been made OPTIONAL with upward compatibility for file based exchange.
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| 3 | UsageName | IfcText | ? | Description of the use of the referenced value within the property. It is a descriptive text that may hold an expression or other additional information. | X |
| 4 | PropertyReference | IfcObjectReferenceSelect | ? |
Reference to another property entity through one of the select types in the IfcObjectReferenceSelect.
IFC4 CHANGE The attribute has been made optional with upward compatibility for file based exchange. | X |
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| IfcPropertyAbstraction | |||||
| HasExternalReferences | IfcExternalReferenceRelationship @RelatedResourceObjects | S[0:?] | Reference to an external reference, e.g. library, classification, or document information, that is associated to the property definition.
IFC4 CHANGE New inverse attribute. | X | |
| IfcProperty | |||||
| 1 | Name | IfcIdentifier | Name for this property. This label is the significant name string that defines the semantic meaning for the property. | X | |
| 2 | Specification | IfcText | ? | Informative text to explain the property. | X |
| PartOfPset | IfcPropertySet @HasProperties | S[0:?] | Reference to the IfcPropertySet by which the IfcProperty is referenced.
IFC4 CHANGE New inverse attribute to navigate from IfcProperty to IfcPropertySet with upward compatibility for file based exchange. | X | |
| PropertyForDependance | IfcPropertyDependencyRelationship @DependingProperty | S[0:?] | The property on whose value that of another property depends. | X | |
| PropertyDependsOn | IfcPropertyDependencyRelationship @DependantProperty | S[0:?] | The relating property on which the value of the property depends. | X | |
| PartOfComplex | IfcComplexProperty @HasProperties | S[0:?] | Reference to the IfcComplexProperty in which the IfcProperty is contained.
IFC4 CHANGE The cardinality has changed to 0..n to allow reuse of instances of IfcProperty in several IfcComplexProperty with upward compatibility for file based exchange. | X | |
| HasConstraints | IfcResourceConstraintRelationship @RelatedResourceObjects | ? S[0:?] | User-defined constraints for the property. | X | |
| HasApprovals | IfcResourceApprovalRelationship @RelatedResourceObjects | ? S[0:?] | User-defined approvals for the property. | X | |
| PartOfMaterialOrProfileProperties | IfcExtendedProperties @Properties | S[0:?] | Reference to the IfcMaterialProperties by which the IfcProperty is referenced. | X | |
| IfcSimpleProperty | |||||
| IfcPropertyReferenceValue | |||||
| 3 | UsageName | IfcText | ? | Description of the use of the referenced value within the property. It is a descriptive text that may hold an expression or other additional information. | X |
| 4 | PropertyReference | IfcObjectReferenceSelect | ? |
Reference to another property entity through one of the select types in the IfcObjectReferenceSelect.
IFC4 CHANGE The attribute has been made optional with upward compatibility for file based exchange. | X |
<xs:element name="IfcPropertyReferenceValue" type="ifc:IfcPropertyReferenceValue" substitutionGroup="ifc:IfcSimpleProperty" nillable="true"/>
<xs:complexType name="IfcPropertyReferenceValue">
<xs:complexContent>
<xs:extension base="ifc:IfcSimpleProperty">
<xs:sequence>
<xs:element name="PropertyReference" nillable="true" minOccurs="0">
<xs:complexType>
<xs:group ref="ifc:IfcObjectReferenceSelect"/>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="UsageName" type="ifc:IfcText" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcPropertyReferenceValue
SUBTYPE OF (IfcSimpleProperty);
UsageName : OPTIONAL IfcText;
PropertyReference : OPTIONAL IfcObjectReferenceSelect;
END_ENTITY;
EXPRESS-G diagram
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