5.1.3.34 IfcRelationship

Relation
Objektifizierte Relation (allgemein)

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.

XSD Specification:

 <xs:element name="IfcRelationship" type="ifc:IfcRelationship" abstract="true" substitutionGroup="ifc:IfcRoot" nillable="true"/>
 <xs:complexType name="IfcRelationship" abstract="true">
  <xs:complexContent>
   <xs:extension base="ifc:IfcRoot"/>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

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

Link to EXPRESS-G diagram EXPRESS-G diagram

Inheritance Graph:

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

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