IFC (IFC4X3) development IfcRelDefinesByProperties 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. Entity inheritance Attributes

# Attribute Type Description
IfcRoot (4)
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,

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.

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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 Formal propositions

Name Description

There shall be no related object being of typy IfcTypeObject.

SIZEOF(QUERY(Types <* SELF\IfcRelDefinesByProperties.RelatedObjects |  'IFC4X3_DEV_cedaad7e.IFCTYPEOBJECT' IN TYPEOF(Types))) = 0
Table Concept usage

Concept Usage Description
IfcRoot (2)
Revision Control General

Ownership, history, and merge state is captured using IfcOwnerHistory.

Software Identity General

IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.

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Table Examples Formal representation

ENTITY IfcRelDefinesByProperties
 SUBTYPE OF (IfcRelDefines);
	RelatedObjects : SET [1:?] OF IfcObjectDefinition;
	RelatingPropertyDefinition : IfcPropertySetDefinitionSelect;
	NoRelatedTypeObject : SIZEOF(QUERY(Types <* SELF\IfcRelDefinesByProperties.RelatedObjects |  'IFC4X3_DEV_cedaad7e.IFCTYPEOBJECT' IN TYPEOF(Types))) = 0;
END_ENTITY; References

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Is this page difficult to understand? Let us know! Changelog

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