5.1.3.38 IfcRelDefines

Définition
Definiert - Relation (allgemein)

A generic and abstract relationship which subtypes are used to:

EXAMPLE  Several instances of windows within the IFC project model may be of the same (catalogue or manufacturer) type. Thereby they share the same properties. This relationship is established by the subtype IfcRelDefinesByType of IfcRelDefines relationship assigning an IfcWindowStyle to multiple occurrences IfcWindow.
EXAMPLE  The (same) property set, e.g.  Pset_ProductManufacturerInfo, keeping the manufacturer name, label and production year of a product, can be assigned to one, or many instances of furnishing. This relationship is established by the subtype IfcRelDefinesByProperties of IfcRelDefines relationship assigning an IfcPropertySet to one or more instances of IfcFurnishingElement.
HISTORY  New entity in IFC2x.
IFC4 CHANGE  The attribute RelatedObjects had been demoted to the subtypes IfcRelDefinesByProperties and IfcRelDefinesByType.

XSD Specification:

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

EXPRESS Specification:

ENTITY IfcRelDefines
ABSTRACT SUPERTYPE OF(ONEOF(IfcRelDefinesByObject, IfcRelDefinesByProperties, IfcRelDefinesByTemplate, IfcRelDefinesByType))
SUBTYPE OF IfcRelationship;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Inheritance Graph:

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

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