5.1.3.38 IfcRelDefinesByProperties
5.1.3.38.1 Semantic 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.
5.1.3.38.2 Entity inheritance
5.1.3.38.3 Attributes
# | Attribute | Type | Description |
---|---|---|---|
IfcRoot (4) | |||
Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes | |||
IfcRelDefinesByProperties (2) | |||
5 | RelatedObjects | SET [1:?] OF IfcObjectDefinition |
Reference to the objects (or single object) to which the property definition applies. |
6 | RelatingPropertyDefinition | IfcPropertySetDefinitionSelect |
Reference to the property set definition for that object or set of objects. |
5.1.3.38.4 Formal propositions
Name | Description |
---|---|
NoRelatedTypeObject |
There shall be no related object being of type IfcTypeObject. |
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5.1.3.38.5 Concept usage
Concept | Usage | Description | |
---|---|---|---|
IfcRoot (2) | |||
Click to show 2 hidden inherited concepts Click to hide 2 inherited concepts |
5.1.3.38.6 Examples
5.1.3.38.7 Formal representation
ENTITY IfcRelDefinesByProperties SUBTYPE OF (IfcRelDefines); RelatedObjects : SET [1:?] OF IfcObjectDefinition; RelatingPropertyDefinition : IfcPropertySetDefinitionSelect; WHERE NoRelatedTypeObject : SIZEOF(QUERY(Types <* SELF\IfcRelDefinesByProperties.RelatedObjects | 'IFC4X3_DEV_738df036.IFCTYPEOBJECT' IN TYPEOF(Types))) = 0; END_ENTITY;