IfcRelDefinesByProperties

Natural language names
Definiert durch Merkmale - Relation
Rel Defines By Properties
Définition par propriétés
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4 4.0.0.0
    IfcRelDefinesByProperties
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
      RelatedObjectsXXMODIFIEDType changed from IfcObject to IfcObjectDefinition.
      RelatingPropertyDefinitionMODIFIEDType 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 assignment of an IfcPropertySet to an IfcTypeObject is not handled via this objectified relationship, but through the direct relationship HasPropertySets at IfcTypeObject.

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
#AttributeTypeCardinalityDescription G
5RelatedObjectsIfcObjectDefinitionS[1:?] Reference to the objects (or single object) to which the property definition applies.
IFC4 CHANGE  Data type promoted from subtype IfcObject.
X
6RelatingPropertyDefinitionIfcPropertySetDefinitionSelect Reference to the property set definition for that object or set of objects. X
Formal Propositions
RuleDescription
NoRelatedTypeObjectThere shall be no related object being of typy IfcTypeObject.
NOTE  The relationship between a IfcTypeObject and a IfcPropertySet is handled through the direct relationship HasPropertySets at IfcTypeObject.
Inherited definitions from supertypes
Entity inheritance IfcRelDefines IfcRelationship IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? 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.
IFC4 CHANGE  The attribute has been changed to be OPTIONAL.
X
3NameIfcLabel? 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
4DescriptionIfcText? Optional description, provided for exchanging informative comments. X
IfcRelationship
IfcRelDefines
IfcRelDefinesByProperties
5RelatedObjectsIfcObjectDefinitionS[1:?] Reference to the objects (or single object) to which the property definition applies.
IFC4 CHANGE  Data type promoted from subtype IfcObject.
X
6RelatingPropertyDefinitionIfcPropertySetDefinitionSelect Reference to the property set definition for that object or set of objects. X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
Formal representations
XML 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;
 WHERE
  NoRelatedTypeObject : SIZEOF(QUERY(Types <* SELF\IfcRelDefinesByProperties.RelatedObjects | 'IFCKERNEL.IfcTypeObject' IN TYPEOF(Types))) = 0;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcContext IfcObject IfcPropertySetDefinition

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