Natural language names
Weist Gruppe mit Faktor zu - Relation
Rel Assigns To Group By Factor
Association à un groupe avec pondération
Change log
IFC2x3 to IFC4
Semantic definitions at the entity
Entity definition

The objectified relationship IfcRelAssignsToGroupByFactor is a specialization of the general grouping mechanism. It allows to add a factor to define the ratio that applies to the assignment of object definitions (individual object occurrences as subtypes of IfcObject and object types as subtypes of IfcTypeObject) to a group (subtypes of IfcGroup).

The ratio can be used to define a percentage assignment. For example, a Factor of 0.8 would indicate that the object is assigned by 80% to the group, or a Factor of 2.5 would indicate the object is assigned with a weight factor of 2.5 to the group.

NOTE  Examples of factored groups include the assignment of load cases in a load combination in structural analysis, or the assignment of spaces by percentage to different rental zones.

The same object or object type may be included with the same or different Factor values to many groups. Grouping relationships are not hierarchical.

HISTORY  New entity in IFC4.
Attribute definitions
#AttributeTypeCardinalityDescription G
8FactorIfcRatioMeasure Factor provided as a ratio measure that identifies the fraction or weighted factor that applies to the group assignment.X
Inherited definitions from supertypes
Entity inheritance IfcRelAssignsToGroup IfcRelAssigns IfcRelationship IfcRoot
Attribute inheritance
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.
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
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
6RelatedObjectsTypeIfcObjectTypeEnum? 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.
7RelatingGroupIfcGroup Reference to group that contains all assigned group members. X
8FactorIfcRatioMeasure Factor provided as a ratio measure that identifies the fraction or weighted factor that applies to the group assignment.X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcRelAssignsToGroupByFactor" type="ifc:IfcRelAssignsToGroupByFactor" substitutionGroup="ifc:IfcRelAssignsToGroup" nillable="true"/>
 <xs:complexType name="IfcRelAssignsToGroupByFactor">
   <xs:extension base="ifc:IfcRelAssignsToGroup">
    <xs:attribute name="Factor" type="ifc:IfcRatioMeasure" use="optional"/>
EXPRESS Specification
ENTITY IfcRelAssignsToGroupByFactor
 SUBTYPE OF (IfcRelAssignsToGroup);
  Factor : IfcRatioMeasure;

Link to EXPRESS-G diagram EXPRESS-G diagram

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