IfcRelAssociatesClassification

BACnet MVD

#### IfcRelAssociatesClassification

Natural language names

| Ordnet Klassifikation zu - Relation
| Rel Associates Classification
| Association à classification

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcRelAssociatesClassification |  |  |  |
OwnerHistory |  |  | MODIFIED | Instantiation changed to OPTIONAL.
RelatedObjects | X | X | MODIFIED | Type changed from IfcRoot to IfcDefinitionSelect.
RelatingClassification | X | X | MODIFIED | Type changed from IfcClassificationNotationSelect to IfcClassificationSelect.

##### Semantic definitions at the entity

Entity definition

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.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
6 | RelatingClassification | IfcClassificationSelect |  | Classification applied to the objects. |  | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRoot
1 | GlobalId | IfcGloballyUniqueId |  | Assignment of a globally unique identifier within the entire software world. | X | X

2

OwnerHistory

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.

X

X

3 | Name | 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. | X | X
4 | Description | IfcText | ? | Optional description, provided for exchanging informative comments. |  | X
IfcRelationship
IfcRelAssociates

5

RelatedObjects

IfcDefinitionSelect

S[1:?]

Set 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.

X

X

IfcRelAssociatesClassification
6 | RelatingClassification | IfcClassificationSelect |  | Classification applied to the objects. |  | X

##### Definitions applying to Design Transfer View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### Definitions applying to BACnet View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### Formal representations

XML Specification
`<xs:element name="IfcRelAssociatesClassification" type="ifc:IfcRelAssociatesClassification" substitutionGroup="ifc:IfcRelAssociates" nillable="true"/>
<xs:complexType name="IfcRelAssociatesClassification">
<xs:complexContent>
<xs:extension base="ifc:IfcRelAssociates">
<xs:sequence>
<xs:element name="RelatingClassification">
<xs:complexType>
<xs:group ref="ifc:IfcClassificationSelect"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcRelAssociatesClassification
SUBTYPE OF (IfcRelAssociates);
RelatingClassification : IfcClassificationSelect;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcClassification IfcClassificationReference

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