IFC 4.3.0.1 (IFC4X3) development

5.1.3.21 IfcRelAssigns

ABSTRACT This definition may not be instantiated

5.1.3.21.1 Semantic definition

The assignment relationship, IfcRelAssigns, is a generalization of "link" relationships among instances of IfcObject and its various 1^st^ level subtypes. A link denotes the specific association through which one object (the client) applies the services of other objects (the suppliers), or through which one object may navigate to other objects.

The client is denoted as the relating object and is established at the level of the specific, instantiable subtypes of IfcRelAssigns. The suppliers are denoted as the related objects and they are established by the RelatedObjects attribute.

The assignment relationship establishes a bi-directional relationship among the participating objects and does not imply any dependency. The subtypes of IfcRelAssigns establishes the particular semantic meaning of the assignment relationship.

5.1.3.21.2 Entity inheritance

5.1.3.21.3 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,

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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IfcRelAssigns (2)
5 RelatedObjects SET [1:?] OF IfcObjectDefinition

Related objects, which are assigned to a single object. The type of the single (or relating) object is defined in the subtypes of IfcRelAssigns.

6 RelatedObjectsType OPTIONAL IfcObjectTypeEnum

Particular type of the assignment relationship. It can constrain the applicable object types, used within the role of RelatedObjects.

Table 5.1.3.21.A

5.1.3.21.4 Formal propositions

Name Description
WR1

Rule checks whether the types of the assigned related objects comply with the constraint given by the RelatedObjectsType. The rule is important for constraint checks at subtypes of IfcRelAssigns or at subtypes of IfcObject, which refers to assignment relationships through the inverse HasAssignments relation.

IfcCorrectObjectAssignment(RelatedObjectsType, RelatedObjects)
Table 5.1.3.21.B

5.1.3.21.5 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.

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Table 5.1.3.21.C

5.1.3.21.6 Formal representation

ENTITY IfcRelAssigns
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcRelAssignsToActor
	,IfcRelAssignsToControl
	,IfcRelAssignsToGroup
	,IfcRelAssignsToProcess
	,IfcRelAssignsToProduct
	,IfcRelAssignsToResource))
 SUBTYPE OF (IfcRelationship);
	RelatedObjects : SET [1:?] OF IfcObjectDefinition;
	RelatedObjectsType : OPTIONAL IfcObjectTypeEnum;
 WHERE
	WR1 : IfcCorrectObjectAssignment(RelatedObjectsType, RelatedObjects);
END_ENTITY;

5.1.3.21.7 References

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