IfcPropertyReferenceValue

Semantic definitions at the entity

Entity definition

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 definitions

#	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

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	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	Description	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
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

Formal representations

XML Specification

 <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>

EXPRESS Specification


ENTITY IfcPropertyReferenceValue

 SUBTYPE OF (IfcSimpleProperty);

  UsageName : OPTIONAL IfcText;

  PropertyReference : OPTIONAL IfcObjectReferenceSelect;

END_ENTITY;

 EXPRESS-G diagram

Item	Change	Description
IFC2x3 to IFC4
IfcPropertyReferenceValue
UsageName	MODIFIED	Type changed from IfcLabel to IfcText.
PropertyReference	MODIFIED	Instantiation changed to OPTIONAL.
IFC4 Addendum 1
IfcPropertyReferenceValue
HasConstraints	ADDED
HasApprovals	ADDED

	Merkmal mit Bezugswert
	Property Reference Value