IFC 4.3.x development

5.1.3.30 IfcRelAssociates

Change log

IFC4

deletions where_rules WR21
modificationsabstract Changed from False to True
modificationsattributes RelatedObjects definitionChanged from set[1:?] of IfcRoot to set[1:?] of IfcDefinitionSelect

5.1.3.30.1 Semantic definitions at the entity

The association relationship IfcRelAssociates refers to sources of information (most notably a classification, library, document, approval, contraint, or material). The information associated may reside internally or externally of the project data. There is no dependency implied by the association.

EXAMPLE  Further external information may be provided to the tank equipment (as subtype of IfcProduct) in terms of its classification and instruction documents, the source of the additional information is held external to the project data model.

Association relationships can be established to objects (occurrences as subtypes of IfcObject) or to types (as subtypes of IfcTypeObject). Some associations (such as approval, or document) may also be applied to property templates (as subtypes of IfcPropertyDefinition).

EXAMPLE  The classification information for the storage tank equipment may be associated to the IfcTankType (subtype of IfcTypeObject), defining the specific information for all occurencies of that tank in the project. Therefore the association of the Uniclass notation 'L6814' may be associated by a subtype of IfcRelAssociates to the type information.

EXAMPLE  The classification information for a particular space within a building may be associated to the IfcSpace object (subtype of IfcObject), defining a particular occurrence of space. Therefore the association of the DIN notation 'NF 1.5' may be associated by a subtype of IfcRelAssociates to the object.

The association relationship establishs an association between one to many objects or property templates and the associated information. The subtypes of IfcRelAssociates establish the particular semantic meaning of the association relationship.

HISTORY  New entity in IFC2x.

IFC4 CHANGE  Entity has been changed into an ABSTRACT supertype

5.1.3.30.1 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
IfcRelAssociates
5RelatedObjectsSET [1:?] OF IfcDefinitionSelectSet of object or property definitions to which the external references or information is associated. It includes object and type objects, property set templates, property templates and property sets and contexts.

> IFC4 CHANGE  The attribute datatype has been changed from IfcRoot to IfcDefinitionSelect.

5.1.3.30.2 Entity inheritance

dot_inheritance IfcRelAssociates_children 6 more... IfcRelAssociates IfcRelAssociates IfcRelAssociates_children->IfcRelAssociates IfcRelationship IfcRelationship IfcRelAssociates->IfcRelationship IfcRelationship_children 5 more... IfcRelationship_children->IfcRelationship IfcRoot IfcRoot IfcRelationship->IfcRoot IfcObjectDefinition IfcObjectDefinition IfcObjectDefinition->IfcRoot IfcPropertyDefinition IfcPropertyDefinition IfcPropertyDefinition->IfcRoot

5.1.3.30.3 Definitions applying to General Usage

5.1.3.30.3.1 Identity

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

5.1.3.30.3.2 Revision Control

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

5.1.3.30.4 Formal representations

ENTITY IfcRelAssociates
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcRelAssociatesApproval
	,IfcRelAssociatesClassification
	,IfcRelAssociatesConstraint
	,IfcRelAssociatesDocument
	,IfcRelAssociatesLibrary
	,IfcRelAssociatesMaterial
	,IfcRelAssociatesProfileDef))
 SUBTYPE OF (IfcRelationship);
	RelatedObjects : SET [1:?] OF IfcDefinitionSelect;
END_ENTITY;