IFC 4.3.x development

8.16.3.11 IfcPropertyReferenceValue

Change log

IFC4

modificationsattributes PropertyReference is_optionalChanged from False to True
modificationsattributes UsageName definition Changed from IfcLabel to IfcText

8.16.3.11.1 Semantic definitions at the entity

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.

8.16.3.11.1 Attributes

# Attribute Type Description
IfcPropertyAbstraction
HasExternalReferencesSET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects Reference to an external reference, e.g. library, classification, or document information, that is associated to the property definition.

> IFC4 CHANGE New inverse attribute.
IfcProperty
1 Name IfcIdentifier Name for this property. This label is the significant name string that defines the semantic meaning for the property.
2 Description OPTIONAL IfcText Informative text to explain the property.
PartOfPset SET [0:?] OF IfcPropertySet FOR HasProperties 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.
PropertyForDependanceSET [0:?] OF IfcPropertyDependencyRelationship FOR DependingProperty The property on whose value that of another property depends.
PropertyDependsOn SET [0:?] OF IfcPropertyDependencyRelationship FOR DependantProperty The relating property on which the value of the property depends.
PartOfComplex SET [0:?] OF IfcComplexProperty FOR HasProperties 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.
HasConstraints SET [0:?] OF IfcResourceConstraintRelationship FOR RelatedResourceObjectsUser-defined constraints for the property.
HasApprovals SET [0:?] OF IfcResourceApprovalRelationship FOR RelatedResourceObjects User-defined approvals for the property.
IfcSimpleProperty
IfcPropertyReferenceValue
3 UsageName OPTIONAL 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.
4 PropertyReference OPTIONAL 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.

8.16.3.11.2 Entity inheritance

dot_inheritance IfcPropertyReferenceValue IfcPropertyReferenceValue IfcSimpleProperty IfcSimpleProperty IfcPropertyReferenceValue->IfcSimpleProperty IfcSimpleProperty_children 5 more... IfcSimpleProperty_children->IfcSimpleProperty IfcProperty IfcProperty IfcSimpleProperty->IfcProperty IfcComplexProperty IfcComplexProperty IfcComplexProperty->IfcProperty IfcPropertyAbstraction IfcPropertyAbstraction IfcProperty->IfcPropertyAbstraction IfcPropertyAbstraction_children 3 more... IfcPropertyAbstraction_children->IfcPropertyAbstraction

8.16.3.11.3 Formal representations

ENTITY IfcPropertyReferenceValue
 SUBTYPE OF (IfcSimpleProperty);
	UsageName : OPTIONAL IfcText;
	PropertyReference : OPTIONAL IfcObjectReferenceSelect;
END_ENTITY;