Ordnet zu - Relation

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

XSD Specification:

 <xs:element name="IfcRelAssociates" type="ifc:IfcRelAssociates" abstract="true" substitutionGroup="ifc:IfcRelationship" nillable="true"/>
 <xs:complexType name="IfcRelAssociates" abstract="true">
   <xs:extension base="ifc:IfcRelationship">
     <xs:element name="RelatedObjects">
       <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"/>

EXPRESS Specification:

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

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

RelatedObjects : 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.

Inheritance Graph:

ENTITY IfcRelAssociates
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcRelationship
ENTITY IfcRelAssociates
RelatedObjects : SET [1:?] OF IfcDefinitionSelect;

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