IfcPropertyDefinition

Natural language names
Merkmal - Definition
Property Definition
Définition de propriété
Semantic definitions at the entity
Entity definition

IfcPropertyDefinition defines the generalization of all characteristics (i.e. a grouping of individual properties), that may be assigned to objects. Currently, subtypes of IfcPropertyDefinition include property set occurrences, property set templates, and property templates.

NOTE  The subtype hierarchy of IfcPropertyDefinition also includes statically defined property sets as IfcPreDefinedPropertySet. Those are rarely used collections of fixed attributes combined in an entity definition. The IfcPreDefinedPropertySet can not be determined by an IfcPropertySetTemplate.
NOTE  Individual properties, (subtypes of IfcProperty), are currently not included in the subtype hierarchy of IfcPropertyDefinition. This anomaly is due to upward compatibility reasons with earlier releases of this standard.

Property definitions define information that is shared among multiple instances of objects, either object occurrences or object types. IfcPropertyDefinition's (by their instantiable subtypes) can participate within the following relationships:

Subtypes are included in more specific relationships, see IfcPropertySetDefinition and IfcPropertyTemplateDefinition for details.

HISTORY  New entity in IFC2.0
Attribute definitions
#AttributeTypeCardinalityDescription G
HasContextIfcRelDeclares
@RelatedDefinitions
S[0:1]X
HasAssociationsIfcRelAssociates
@RelatedObjects
S[0:?]Reference to the relationship IfcRelAssociates and thus to those externally defined concepts, like classifications, documents, or library information, which are associated to the property definition.X
Inherited definitions from supertypes
Entity inheritance IfcPropertySetDefinition IfcPropertyTemplateDefinition 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
IfcPropertyDefinition
HasContextIfcRelDeclares
@RelatedDefinitions
S[0:1]X
HasAssociationsIfcRelAssociates
@RelatedObjects
S[0:?]Reference to the relationship IfcRelAssociates and thus to those externally defined concepts, like classifications, documents, or library information, which are associated to the property definition.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="IfcPropertyDefinition" type="ifc:IfcPropertyDefinition" abstract="true" substitutionGroup="ifc:IfcRoot" nillable="true"/>
 <xs:complexType name="IfcPropertyDefinition" abstract="true">
  <xs:complexContent>
   <xs:extension base="ifc:IfcRoot"/>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcPropertyDefinition
 ABSTRACT SUPERTYPE OF(ONEOF(IfcPropertySetDefinition, IfcPropertyTemplateDefinition))
 SUBTYPE OF (IfcRoot);
 INVERSE
  HasContext : SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
  HasAssociations : SET [0:?] OF IfcRelAssociates FOR RelatedObjects;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcDefinitionSelect

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