IfcPropertyAbstraction

Item	SPF	XML	Change	Description
IFC2x3 to IFC4
IfcPropertyAbstraction			ADDED

Semantic definitions at the entity

Entity definition

The IfcPropertyAbstraction is an abstract supertype of all property related entities defined as dependent resource entities within the specification. It may have an external reference to a dictionary or library that provides additional information about its definition. Instantiable subtypes have property name, value and other instance information.

HISTORY New entity in IFC4.

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
	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

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

Formal representations

XML Specification

 <xs:element name="IfcPropertyAbstraction" type="ifc:IfcPropertyAbstraction" abstract="true" substitutionGroup="ifc:Entity" nillable="true"/>

 <xs:complexType name="IfcPropertyAbstraction" abstract="true">

  <xs:complexContent>

   <xs:extension base="ifc:Entity"/>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcPropertyAbstraction

 ABSTRACT SUPERTYPE OF(ONEOF(IfcExtendedProperties, IfcPreDefinedProperties, IfcProperty, IfcPropertyEnumeration));

 INVERSE

  HasExternalReferences : SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects;

END_ENTITY;

 EXPRESS-G diagram

	Merkmal - Abstraktion
	Property Abstraction
	Propriété abstraite