IFC 4.3.x development

5.1.3.31 IfcRelAssociatesClassification

Change log

IFC4

modificationsattributes RelatingClassification definitionChanged from IfcClassificationNotationSelect to IfcClassificationSelect

5.1.3.31.1 Semantic definitions at the entity

The objectified relationship IfcRelAssociatesClassification handles the assignment of a classification item (items of the select IfcClassificationSelect) to objects occurrences (subtypes of IfcObject) or object types (subtypes of IfcTypeObject).

The relationship is used to assign a classification item, or a classification system itself to objects. Depending on the type of the RelatingClassification it is either:

  • a reference to an classification item within an external classification system, or
  • a reference to the classification system itself

NOTE  The reference to a classification item includes a link to the classification system within which the item is declared. It assigns the meaning of the classification item to the object (ocurrence or type). The reference to the classification system provides the information that the object (occurrence or type) is governed by the classification system but no assignment of a particular items has been done yet.

The inherited attribute RelatedObjects define the objects or object types to which the classification is applied. The attribute RelatingClassification is the reference to a classification, applied to the object(s). A single RelatingClassification can thereby be applied to one or multiple objects.

HISTORY  New entity in IFC2x.

5.1.3.31.1 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
5RelatedObjects SET [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.
IfcRelAssociatesClassification
6RelatingClassificationIfcClassificationSelect Classification applied to the objects.

5.1.3.31.2 Entity inheritance

dot_inheritance IfcRelAssociatesClassification IfcRelAssociatesClassification IfcRelAssociates IfcRelAssociates IfcRelAssociatesClassification->IfcRelAssociates IfcRelAssociates_children 6 more... 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

5.1.3.31.3 Definitions applying to General Usage

5.1.3.31.3.1 Identity

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

5.1.3.31.3.2 Revision Control

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

5.1.3.31.4 Formal representations

ENTITY IfcRelAssociatesClassification
 SUBTYPE OF (IfcRelAssociates);
	RelatingClassification : IfcClassificationSelect;
END_ENTITY;