IfcRelDefinesByProperties

Item	SPF	XML	Change	Description
IFC2x3 to IFC4
IfcRelDefinesByProperties
OwnerHistory			MODIFIED	Instantiation changed to OPTIONAL.
RelatedObjects	X	X	MODIFIED	Type changed from IfcObject to IfcObjectDefinition.
RelatingPropertyDefinition			MODIFIED	Type changed from IfcPropertySetDefinition to IfcPropertySetDefinitionSelect.

Semantic definitions at the entity

Entity definition

The objectified relationship IfcRelDefinesByProperties defines the relationships between property set definitions and objects. Properties are aggregated in property sets. Property sets can be either directly assigned to occurrence objects using this relationship, or assigned to an object type and assigned via that type to occurrence objects.

The IfcRelDefinesByProperties is an N-to-N relationship, as it allows for the assignment of one or more property sets to one or more objects. Those objects then share the same property definition.

HISTORY New entity in IFC2.0. Has been renamed from IfcRelAssignsProperties in IFC2x.

IFC4 CHANGE The attribute RelatedObjects had been demoted from the supertype IfcRelDefines to IfcRelDefinesByProperties. This relationship has been modified to support multiple property sets referenced by a single relationship.

Attribute definitions

#	Attribute	Type	Cardinality	Description	B
5	RelatedObjects	IfcObjectDefinition	S[1:?]	Reference to the objects (or single object) to which the property definition applies.	X
6	RelatingPropertyDefinition	IfcPropertySetDefinitionSelect	[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	B
IfcRoot
1	GlobalId	IfcGloballyUniqueId	[1:1]	Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	IfcOwnerHistory	[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.	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
IfcRelDefinesByProperties
5	RelatedObjects	IfcObjectDefinition	S[1:?]	Reference to the objects (or single object) to which the property definition applies.	X
6	RelatingPropertyDefinition	IfcPropertySetDefinitionSelect	[1:1]	Reference to the property set definition for that object or set of objects.	X

Definitions applying to Bridge View

Concept inheritance

#	Concept	Model View
IfcRoot
	Software Identity	Bridge View
	User Identity	Bridge View
	Object Ownership	Bridge View

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">

      <xs:complexType>

       <xs:group ref="ifc:IfcPropertySetDefinitionSelect"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcRelDefinesByProperties

 SUBTYPE OF (IfcRelDefines);

  RelatedObjects : SET [1:?] OF IfcObjectDefinition;

  RelatingPropertyDefinition : IfcPropertySetDefinitionSelect;

END_ENTITY;

 EXPRESS-G diagram

Link to this page

	Definiert durch Merkmale - Relation: Relation zwischen einem Objekt und dessen beschreibenden Merkmalen
	Rel Defines By Properties
	Définition par propriétés