IfcRelDefinesByProperties

Semantic definitions at the entity

Entity definition

This objectified relationship (IfcRelDefinesByProperties) defines the relationships between property set definitions and objects. Properties are aggregated in property sets, property sets can be grouped to define an object type.

The IfcRelDefinesByProperties is a 1-to-N relationship, as it allows for the assignment of one property set to a single or to many objects. Those objects then share the same property definition.

HISTORY: New Entity in IFC Release 2.0. Has been renamed from IfcRelAssignsProperties in IFC Release 2x.

Attribute definitions

#	Attribute	Type	Cardinality	Description	A
6	RelatingPropertyDefinition	IfcPropertySetDefinition	[1:1]	Reference to the property set definition for that object or set of objects.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	A
IfcRoot
1	GlobalId	IfcGloballyUniqueId	[1:1]	Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	IfcOwnerHistory	[1:1]	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.	X
3	Name	IfcLabel	[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
4	Description	IfcText	[0:1]	Optional description, provided for exchanging informative comments.	X
IfcRelationship
IfcRelDefines
5	RelatedObjects	IfcObject	S[1:?]	Reference to the objects (or single object) to which the property definition applies.	X
IfcRelDefinesByProperties
6	RelatingPropertyDefinition	IfcPropertySetDefinition	[1:1]	Reference to the property set definition for that object or set of objects.	X

Formal representations

XSD Specification

 <xs:element name="IfcRelDefinesByProperties" type="ifc:IfcRelDefinesByProperties" substitutionGroup="ifc:IfcRelDefines" nillable="true"/>

 <xs:complexType name="IfcRelDefinesByProperties">

  <xs:complexContent>

   <xs:extension base="ifc:IfcRelDefines">

    <xs:sequence>

     <xs:element name="RelatingPropertyDefinition" type="ifc:IfcPropertySetDefinition" nillable="true"/>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcRelDefinesByProperties

 SUBTYPE OF (IfcRelDefines);

  RelatingPropertyDefinition : IfcPropertySetDefinition;

END_ENTITY;

 EXPRESS-G diagram