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

- IfcRoot

5.1.3.38.3 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, 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.
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. IFC4-CHANGE Data type promoted from subtype IfcObject.
6	RelatingPropertyDefinition	IfcPropertySetDefinitionSelect	Reference to the property set definition for that object or set of objects.

Table 5.1.3.38.G

5.1.3.38.4 Formal propositions

Name	Description
NoRelatedTypeObject	There shall be no related object being of typy IfcTypeObject. NOTE The relationship between a IfcTypeObject and a IfcPropertySet is handled through the direct relationship HasPropertySets at IfcTypeObject.
`SIZEOF(QUERY(Types <* SELF\IfcRelDefinesByProperties.RelatedObjects \| 'IFC4X3.IFCTYPEOBJECT' IN TYPEOF(Types))) = 0`

Table 5.1.3.38.H

5.1.3.38.5 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.
Click to show 2 hidden inherited concepts Click to hide 2 inherited concepts

Table 5.1.3.38.I

5.1.3.38.6 Examples

Figure 5.1.3.38.A

Georeferencing_Tin_1
Figure 5.1.3.38.B

Georeferencing_Tin_2
Figure 5.1.3.38.C

Georeferencing_Tiny_Survey_1
Figure 5.1.3.38.D

Georeferencing_Tin_5
Figure 5.1.3.38.E

Georeferencing_Tin_3
Figure 5.1.3.38.F

Georeferencing_Tin_4

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.IFCTYPEOBJECT' IN TYPEOF(Types))) = 0;
END_ENTITY;