IfcRelAssociates

BACnet MVD

#### IfcRelAssociates

Natural language names

| Ordnet zu - Relation
| Rel Associates
| Association

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcRelAssociates |  |  | MODIFIED | Instantiation changed to ABSTRACT.

##### Semantic definitions at the entity

Entity definition

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

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---

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

##### 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

##### 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="IfcRelAssociates" type="ifc:IfcRelAssociates" abstract="true" substitutionGroup="ifc:IfcRelationship" nillable="true"/>
<xs:complexType name="IfcRelAssociates" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:IfcRelationship">
<xs:sequence>
<xs:element name="RelatedObjects">
<xs:complexType>
<xs:group ref="ifc:IfcDefinitionSelect" maxOccurs="unbounded"/>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcDefinitionSelect"/>
<xs:attribute ref="ifc:cType" fixed="set"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcRelAssociates
ABSTRACT SUPERTYPE OF(ONEOF(IfcRelAssociatesApproval, IfcRelAssociatesClassification, IfcRelAssociatesConstraint, IfcRelAssociatesDocument, IfcRelAssociatesLibrary, IfcRelAssociatesMaterial))
SUBTYPE OF (IfcRelationship);
RelatedObjects : SET [1:?] OF IfcDefinitionSelect;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcObjectDefinition IfcPropertyDefinition

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