IFC 4.3.0.1 (IFC4X3) development

5.1.3.27 IfcRelAssignsToProduct

5.1.3.27.1 Semantic definition

The objectified relationship IfcRelAssignsToProduct handles the assignment of objects (subtypes of IfcObject) to a product (subtypes of IfcProduct). The Name attribute should be used to classify the usage of the IfcRelAssignsToProduct objectified relationship. The following Name values are proposed:

  • 'Context' : Assignment of a context specific representation, such as of structural members to a different context representation (with potentially different decomposition breakdown) such as of building elements for a specific context specific representation. 
  • 'View' : Assignment of a product (via RelatingProduct) that is decomposed according to a discipline view, to another product (via RelatedObjects) that is decomposed according to a different discipline view. An example is the assignment of the architectural slab to a different decomposition of the pre manufactured sections of a slab (under a precast concrete discipline view).

5.1.3.27.2 Entity inheritance

5.1.3.27.3 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.

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.

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IfcRelAssignsToProduct (1)
7 RelatingProduct IfcProductSelect

Reference to the product or product type to which the objects are assigned to.

Table 5.1.3.27.A

5.1.3.27.4 Formal propositions

Name Description
NoSelfReference

The instance to which the relation points, as provided by RelatingProduct shall not be contained in the set of RelatedObjects.

SIZEOF(QUERY(Temp <* SELF\IfcRelAssigns.RelatedObjects | RelatingProduct :=: Temp)) = 0
Table 5.1.3.27.B

5.1.3.27.5 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 5.1.3.27.C

5.1.3.27.6 Formal representation

ENTITY IfcRelAssignsToProduct
 SUBTYPE OF (IfcRelAssigns);
	RelatingProduct : IfcProductSelect;
 WHERE
	NoSelfReference : SIZEOF(QUERY(Temp <* SELF\IfcRelAssigns.RelatedObjects | RelatingProduct :=: Temp)) = 0;
END_ENTITY;

5.1.3.27.7 References

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5.1.3.27.8 Changelog