IfcRelAssignsToProduct

Item	Change	Description
IFC2x3 to IFC4
IfcRelAssignsToProduct
OwnerHistory	MODIFIED	Instantiation changed to OPTIONAL.
RelatingProduct	MODIFIED	Type changed from IfcProduct to IfcProductSelect.

Semantic definitions at the entity

Entity 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).

HISTORY New entity in IFC2x

IFC2x3 CHANGE The reference of a product within a spatial structure is now handled by a new relationship object IfcRelReferencedInSpatialStructure. The IfcRelAssignsToProduct shall not be used to represent this relation from IFC2x3 onwards.

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
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.	X

Formal Propositions

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

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcRoot
1	GlobalId	IfcGloballyUniqueId		Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	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.	X
3	Name	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.	X
4	Description	IfcText	?	Optional description, provided for exchanging informative comments.	X
IfcRelationship
IfcRelAssigns
5	RelatedObjects	IfcObjectDefinition	S[1:?]	Related objects, which are assigned to a single object. The type of the single (or relating) object is defined in the subtypes of IfcRelAssigns.	X
6	RelatedObjectsType	IfcObjectTypeEnum	?	Particular type of the assignment relationship. It can constrain the applicable object types, used within the role of RelatedObjects. IFC4 CHANGE The attribute is deprecated and shall no longer be used. A NIL value should always be assigned.	X
IfcRelAssignsToProduct
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.	X

#	Concept	Template	Model View
IfcRoot
	Identity	Software Identity	General Usage
	Revision Control	Revision Control	General Usage

Formal representations

XML Specification

 <xs:element name="IfcRelAssignsToProduct" type="ifc:IfcRelAssignsToProduct" substitutionGroup="ifc:IfcRelAssigns" nillable="true"/>

 <xs:complexType name="IfcRelAssignsToProduct">

  <xs:complexContent>

   <xs:extension base="ifc:IfcRelAssigns">

    <xs:sequence>

     <xs:element name="RelatingProduct">

      <xs:complexType>

       <xs:group ref="ifc:IfcProductSelect"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcRelAssignsToProduct

 SUBTYPE OF (IfcRelAssigns);

  RelatingProduct : IfcProductSelect;

 WHERE

  NoSelfReference : SIZEOF(QUERY(Temp <* SELF\IfcRelAssigns.RelatedObjects | RelatingProduct :=: Temp)) = 0;
END_ENTITY;

 EXPRESS-G diagram

	Weist Produkt zu - Relation
	Rel Assigns To Product
	Assignation à produit

IfcRelAssignsToProduct

Semantic definitions at the entity

Inherited definitions from supertypes

Definitions applying to General Usage

Formal representations