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.
|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 in 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.|
|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 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.
|7||RelatingGroup||IfcGroup||Reference to group that contains all assigned group members.|
|8||Factor||IfcRatioMeasure||Factor provided as a ratio measure that identifies the fraction or weighted factor that applies to the group assignment.|
IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.
Ownership, history, and merge state is captured using IfcOwnerHistory.
ENTITY IfcRelAssignsToGroupByFactor SUBTYPE OF (IfcRelAssignsToGroup); Factor : IfcRatioMeasure; END_ENTITY;