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

- IfcRoot

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, NOTE Only the last modification is 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.
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 IfcStrippedOptional	Particular type of the assignment relationship. It can constrain the applicable object types, used within the role of RelatedObjects. IFC4-DEPRECATION The attribute is deprecated and shall no longer be used. A NIL value should always be assigned. IFC4.3.0.1-CHANGE The attribute type has been changed to IfcStrippedOptional given that IfcObjectTypeEnum has been deleted.
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IfcRelAssignsToProduct (1)
7	RelatingProduct	IfcProductSelect	Reference to the product or product type to which the objects are assigned to. IFC4-CHANGE Datatype expanded to include IfcProduct and IfcTypeProduct.

Table 5.1.3.27.B

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.C

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.D

5.1.3.27.6 Examples

Figure 5.1.3.27.A

Construction Scheduling Task

5.1.3.27.7 Formal representation

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