|modifications||attributes RelatingPropertyDefinition definition||Changed from IfcPropertySetDefinition to set[1:?] of IfcObjectDefinition|
|modifications||attributes RelatingPropertyDefinition name||Changed from RelatingPropertyDefinition to RelatedObjects|
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.
|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.|
|5||RelatedObjects||IfcContext||Reference to the objects (or single object) to which the property definition applies.|
> IFC4 CHANGE Data type promoted from subtype IfcObject.
|6||RelatingPropertyDefinition||IfcPropertySetDefinitionSelect||Reference to the property set definition for that object or set of objects.|
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 IfcRelDefinesByProperties SUBTYPE OF (IfcRelDefines); RelatingPropertyDefinition : IfcPropertySetDefinitionSelect; RelatedObjects : IfcContext; WHERE NoRelatedTypeObject : SIZEOF(QUERY(Types <* SELF\IfcRelDefinesByProperties.RelatedObjects | 'IFC4X3_DEV.IFCTYPEOBJECT' IN TYPEOF(Types))) = 0; END_ENTITY;