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IfcRelationship

Definition from IAI: 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 IFC Release 1.0.

EXPRESS specification:

ENTITY IfcRelationship
ABSTRACT SUPERTYPE OF (ONEOF(IfcRelAssigns, IfcRelDecomposes, IfcRelAssociates, IfcRelDefines, IfcRelConnects))
SUBTYPE OF ( IfcRoot);
END_ENTITY;

Inheritance graph

ENTITY IfcRelationship;
ENTITY IfcRoot;
GlobalId  :  IfcGloballyUniqueId;
OwnerHistory  :  IfcOwnerHistory;
Name  :  OPTIONAL IfcLabel;
Description  :  OPTIONAL IfcText;
ENTITY IfcRelationship;
END_ENTITY;