5.1.3.25 IfcRelAssignsToGroupByFactor

5.1.3.25.1 Semantic 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.

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

5.1.3.25.2 Entity inheritance

1. • IfcRoot
2. • IfcRelationship
   • IfcObjectDefinition
   • IfcPropertyDefinition
3. • IfcRelAssigns
   • IfcRelAssociates
   • IfcRelConnects
   • IfcRelDeclares
   • IfcRelDecomposes
   • IfcRelDefines
4. • IfcRelAssignsToGroup
   • IfcRelAssignsToActor
   • IfcRelAssignsToControl
   • IfcRelAssignsToProcess
   • IfcRelAssignsToProduct
   • IfcRelAssignsToResource
5. • IfcRelAssignsToGroupByFactor

5.1.3.25.3 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 IfcStrippedOptional	Particular type of the assignment relationship. It can constrain the applicable object types, used within the role of RelatedObjects.
IfcRelAssignsToGroup (1)
7	RelatingGroup	IfcGroup	Reference to group that contains all assigned group members.
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IfcRelAssignsToGroupByFactor (1)
8	Factor	IfcRatioMeasure	Factor provided as a ratio measure that identifies the fraction or weighted factor that applies to the group assignment.

5.1.3.25.4 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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5.1.3.25.5 Formal representation

ENTITY IfcRelAssignsToGroupByFactor
 SUBTYPE OF (IfcRelAssignsToGroup);
	Factor : IfcRatioMeasure;
END_ENTITY;

5.1.3.25.6 References

• IfcRelAssignsToGroup