|modifications||inverses PropertyDefinitionOf definition||Changed from SET OF [0:1] IfcRelDefinesByProperties FOR RelatingPropertyDefinition to SET OF [0:?] IfcTypeObject FOR HasPropertySets|
|modifications||inverses PropertyDefinitionOf name||Changed from PropertyDefinitionOf to DefinesType|
IfcPropertySetDefinition is a generalization of all individual property sets that can be assigned to an object or type object. The property set definition can be either:
Property set definitions define information that is shared among multiple instances of objects, either object occurrences or object types. IfcPropertySetDefinition's (by their instantiable subtypes) can participate within the following relationships:
NOTE Properties assigned to object occurrences may override properties assigned to the object type. See IfcRelDefinesByType for further information.
HISTORY New entity in IFC2x
IFC4 CHANGE The subtype IfcPreDefinedPropertySet has been added.
|1||GlobalId||IfcGloballyUniqueId||Assignment of a globally unique identifier within the entire software world.|
|2||OwnerHistory||OPTIONAL IfcOwnerHistory||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.
|3||Name||OPTIONAL IfcLabel||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.|
|4||Description||OPTIONAL IfcText||Optional description, provided for exchanging informative comments.|
|HasContext||SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions|
|HasAssociations||SET [0:?] OF IfcRelAssociates FOR RelatedObjects||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.|
|DefinesType||SET [0:?] OF IfcTypeObject FOR HasPropertySets||The type object to which the property set is assigned. The property set acts as a shared property set to all occurrences of the type object.|
> NOTE The relationship between the IfcPropertySetDefinition and the IfcTypeObject is a direct relationship, not utilizing IfcRelDefinesByProperties, for maintaining compatibility with earlier releases of this standard.
> IFC4 CHANGE The cardinality has been changed from 0:1 to 0:? with upward compatibility for file based exchange.
|IsDefinedBy||SET [0:?] OF IfcRelDefinesByTemplate FOR RelatedPropertySets||Relation to the property set template, via the objectified relationship IfcRelDefinesByTemplate, that, if given, provides the definition template for the property set or quantity set and its properties. |
> IFC4 CHANGE New inverse relationship, change made with upward compatibility for file based exchange.
|DefinesOccurrence||SET [0:?] OF IfcRelDefinesByProperties FOR RelatingPropertyDefinition||Reference to the relation to one or many object occurrences that are characterized by the property set definition. A single property set can be assigned to multiple object occurrences using the objectified relationship IfcRefDefinesByProperties.|
> IFC4 CHANGE Inverse attribute renamed from PropertyDefinitionOf with upward compatibility for file-based exchange.
IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.
Ownership, history, and merge state is captured using IfcOwnerHistory.
ENTITY IfcPropertySetDefinition ABSTRACT SUPERTYPE OF (ONEOF (IfcPreDefinedPropertySet ,IfcPropertySet ,IfcQuantitySet)) SUBTYPE OF (IfcPropertyDefinition); INVERSE DefinesType : SET [0:?] OF IfcTypeObject FOR HasPropertySets; IsDefinedBy : SET [0:?] OF IfcRelDefinesByTemplate FOR RelatedPropertySets; DefinesOccurrence : SET [0:?] OF IfcRelDefinesByProperties FOR RelatingPropertyDefinition; END_ENTITY;