IfcRelAssigns

Natural language names
Weist zu - Relation
Rel Assigns
Assignation
Semantic definitions at the entity
Entity definition

The assignment relationship, IfcRelAssigns, is a generalization of "link" relationships among instances of IfcObject and its various 1st 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.

NOTE  The terms "client" and "supplier" are used in a general concept and do not imply any meaning for implementations of systems (like client-server).

EXAMPLE  A resource may receive information about its nature of representing real building products by establishing a link between IfcResource and IfcBuildingElement (subtype of IfcProduct) through the assignment relationship IfcRelAssignsToResource. The resource is then the client that applies the services of other objects (here building elements) to express the particular view of elements to be consumed as a resource in a process.

The assignment relationship establishs 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.

HISTORY  New entity in IFC2x.

Attribute definitions
#AttributeTypeCardinalityDescription G
5RelatedObjectsIfcObjectDefinitionS[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
6RelatedObjectsTypeIfcStrippedOptional? 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.
IFC4.3.0.1-CHANGE The attribute type has been changed to IfcStrippedOptional given that IfcObjectTypeEnum has been deleted.
X
Inherited definitions from supertypes
Entity inheritance IfcRelAssignsToActor IfcRelAssignsToControl IfcRelAssignsToGroup IfcRelAssignsToProcess IfcRelAssignsToProduct IfcRelAssignsToResource IfcRelationship IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? 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
3NameIfcLabel? 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
4DescriptionIfcText? Optional description, provided for exchanging informative comments. X
IfcRelationship
IfcRelAssigns
5RelatedObjectsIfcObjectDefinitionS[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
6RelatedObjectsTypeIfcStrippedOptional? 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.
IFC4.3.0.1-CHANGE The attribute type has been changed to IfcStrippedOptional given that IfcObjectTypeEnum has been deleted.
X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcRelAssigns" type="ifc:IfcRelAssigns" abstract="true" substitutionGroup="ifc:IfcRelationship" nillable="true"/>
 <xs:complexType name="IfcRelAssigns" abstract="true">
  <xs:complexContent>
   <xs:extension base="ifc:IfcRelationship">
    <xs:sequence>
     <xs:element name="RelatedObjects">
      <xs:complexType>
       <xs:sequence>
        <xs:element ref="ifc:IfcObjectDefinition" maxOccurs="unbounded"/>
       </xs:sequence>
       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcObjectDefinition"/>
       <xs:attribute ref="ifc:cType" fixed="set"/>
       <xs:attribute ref="ifc:arraySize" use="optional"/>
      </xs:complexType>
     </xs:element>
    </xs:sequence>
    <xs:attribute name="RelatedObjectsType" type="ifc:IfcStrippedOptional" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcRelAssigns
 ABSTRACT SUPERTYPE OF(ONEOF(IfcRelAssignsToActor, IfcRelAssignsToControl, IfcRelAssignsToGroup, IfcRelAssignsToProcess, IfcRelAssignsToProduct, IfcRelAssignsToResource))
 SUBTYPE OF (IfcRelationship);
  RelatedObjects : SET [1:?] OF IfcObjectDefinition;
  RelatedObjectsType : OPTIONAL IfcStrippedOptional;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcObjectDefinition

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