IFC 4.3.x development

5.1.3.26 IfcRelAssignsToGroupByFactor

Change log

IFC4

added

5.1.3.26.1 Semantic definitions at the entity

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.

5.1.3.26.1 Attributes

#Attribute Type Description
IfcRoot
1GlobalId IfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world.
2OwnerHistory 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.
3Name 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.
4Description OPTIONAL IfcText Optional description, provided for exchanging informative comments.
IfcRelationship
IfcRelAssigns
5RelatedObjects SET [1:?] OF IfcObjectDefinitionRelated objects, which are assigned to a single object. The type of the single (or relating) object is defined in the subtypes of IfcRelAssigns.
6RelatedObjectsTypeOPTIONAL 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.
IfcRelAssignsToGroup
7RelatingGroup IfcGroup Reference to group that contains all assigned group members.
IfcRelAssignsToGroupByFactor
8Factor IfcRatioMeasure Factor provided as a ratio measure that identifies the fraction or weighted factor that applies to the group assignment.

5.1.3.26.2 Entity inheritance

dot_inheritance IfcRelAssignsToGroupByFactor IfcRelAssignsToGroupByFactor IfcRelAssignsToGroup IfcRelAssignsToGroup IfcRelAssignsToGroupByFactor->IfcRelAssignsToGroup IfcRelAssigns IfcRelAssigns IfcRelAssignsToGroup->IfcRelAssigns IfcRelAssigns_children 5 more... IfcRelAssigns_children->IfcRelAssigns IfcRelationship IfcRelationship IfcRelAssigns->IfcRelationship IfcRelationship_children 5 more... IfcRelationship_children->IfcRelationship IfcRoot IfcRoot IfcRelationship->IfcRoot IfcObjectDefinition IfcObjectDefinition IfcObjectDefinition->IfcRoot IfcPropertyDefinition IfcPropertyDefinition IfcPropertyDefinition->IfcRoot

5.1.3.26.3 Definitions applying to General Usage

5.1.3.26.3.1 Identity

IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.

5.1.3.26.3.2 Revision Control

Ownership, history, and merge state is captured using IfcOwnerHistory.

5.1.3.26.4 Formal representations

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