Natural language names
deObjektifizierte Relation (allgemein)
Semantic definitions at the entity
Entity definition

IfcRelationship is the abstract generalization of all objectified relationships in IFC. Objectified relationships are the preferred way to handle relationships among objects. This allows to keep relationship specific properties directly at the relationship and opens the possibility to later handle relationship specific behavior.

There are two different types of relationships, 1-to-1 relationships and 1-to-many relationship. used within the subtypes of IfcRelationship. The following convention applies to all subtypes:

HISTORY  New entity in IFC1.0.
Inherited definitions from supertypes
Entity inheritance IfcRelAssigns IfcRelAssociates IfcRelConnects IfcRelDeclares IfcRelDecomposes IfcRelDefines IfcRoot
Attribute inheritance
1GlobalIdIfcGloballyUniqueId[1:1] Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory[0:1] Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,
NOTE  only the last modification in stored - either as addition, deletion or modification.
3NameIfcLabel[0:1] Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule. X
4DescriptionIfcText[0:1] Optional description, provided for exchanging informative comments.X
Definitions applying to Common Use Definitions

Concept inheritance

#ConceptModel View
Software IdentityCommon Use Definitions
Revision ControlCommon Use Definitions
Formal representations
XSD Specification
 <xs:element name="IfcRelationship" type="ifc:IfcRelationship" abstract="true" substitutionGroup="ifc:IfcRoot" nillable="true"/>
 <xs:complexType name="IfcRelationship" abstract="true">
   <xs:extension base="ifc:IfcRoot"/>
EXPRESS Specification
ENTITY IfcRelationship
 ABSTRACT SUPERTYPE OF(ONEOF(IfcRelAssigns, IfcRelAssociates, IfcRelConnects, IfcRelDeclares, IfcRelDecomposes, IfcRelDefines))
 SUBTYPE OF (IfcRoot);

Link to EXPRESS-G diagram EXPRESS-G diagram

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