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5.1.3.38 IfcRelDefinesByProperties

RV ⓘ
AbV ⓘ

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
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.

Table 5.1.3.38.B

5.1.3.38.4 Formal propositions

Name Description
NoRelatedTypeObject

There shall be no related object being of type IfcTypeObject.

SIZEOF(QUERY(Types <* SELF\IfcRelDefinesByProperties.RelatedObjects |  'IFC4X3_DEV_738df036.IFCTYPEOBJECT' IN TYPEOF(Types))) = 0
Table 5.1.3.38.C

5.1.3.38.5 Concept usage

Concept Usage Description
IfcRoot (2)
Click to show 2 hidden inherited concepts
Table 5.1.3.38.D

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;

5.1.3.38.8 References

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5.1.3.38.9 Changelog

5.1.3.38.9.1 IFC4

  • attribute, RelatingPropertyDefinition
  • where rule, NoRelatedTypeObject
  • attribute RelatingPropertyDefinition name, Changed from "RelatingPropertyDefinition" to "RelatedObjects"
  • attribute RelatingPropertyDefinition type, Changed from "IfcPropertySetDefinition" to "set[1:?] of IfcObjectDefinition"