Klassifikationseintrag | |
Classification Reference | |
Référence de classification |
Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
---|---|---|---|---|
IfcClassificationReference | ||||
Location | MODIFIED | Type changed from IfcLabel to IfcURIReference. | ||
Identification | X | MODIFIED | Name changed from ItemReference to Identification. | |
ReferencedSource | MODIFIED | Type changed from IfcClassification to IfcClassificationReferenceSelect. | ||
Description | ADDED | |||
Sort | ADDED |
An IfcClassificationReference is a reference into a classification system or source (see IfcClassification) for a specific classification key (or notation).
The inherited attributes have the following meaning:
The IfcClassificationReference can either be assigned directly to the IfcClassification, such as if no classification hierarchy has to be included, or it references the parent classification notation, if the fully classification hierarchy is included in the data set. The first is refered to as "lightweight classification", and the second as "full classification". The attribute ReferencedSource then holds the following information (choice by IfcClassificationReferenceSelect):
EXAMPLE The IfcClassificationReference can be used as a form of 'lightweight' classification through the 'Identification' attribute inherited from the abstract IfcExternalReference class. In this case, the 'Identification' could take (for instance) the Uniclass notation "L6814" which, if the classification was well understood by all parties and was known to be taken from a particular classification source, would be sufficient. The Name attribute could be the title "Tanking". This would remove the need for the overhead of the more complete classification structure of the model.
HISTORY New entity in IFC2x.
IFC4 CHANGE The attribute Description and inverse attribute HasReferences are added. The attribute Identification has been renamed from ItemReference.
# | Attribute | Type | Cardinality | Description | C |
---|---|---|---|---|---|
4 | ReferencedSource | IfcClassificationReferenceSelect | [0:1] | The classification system or source that is referenced. | X |
5 | Description | IfcText | [0:1] | Description of the classification reference for informational purposes. | X |
6 | Sort | IfcIdentifier | [0:1] | Optional identifier to sort the set of classification references within the referenced source (either a classification facet of higher level, or the classification system itself). | X |
ClassificationRefForObjects | IfcRelAssociatesClassification @RelatingClassification | S[0:?] | The classification reference with which objects are associated. | X | |
HasReferences | IfcClassificationReference @ReferencedSource | S[0:?] | The parent classification references to which this child classification reference applies. It can either be the final classification item leaf node, or an intermediate classification item. | X |
# | Attribute | Type | Cardinality | Description | C |
---|---|---|---|---|---|
IfcExternalReference | |||||
1 | Location | IfcURIReference | [0:1] | Location, where the external source (classification, document or library) can be accessed by electronic means. The electronic location is provided as an URI, and would normally be given as an URL location string. | X |
2 | Identification | IfcIdentifier | [0:1] |
The Identification provides a unique identifier of the referenced item within the external source (classification, document or library). It may be provided as
| X |
3 | Name | IfcLabel | [0:1] | Optional name to further specify the reference. It can provide a human readable identifier (which does not necessarily need to have a counterpart in the internal structure of the document). | X |
ExternalReferenceForResources | IfcExternalReferenceRelationship @RelatingReference | S[0:?] | Reference to all associations between this external reference and objects within the IfcResourceObjectSelect that are tagged by the external reference. | X | |
IfcClassificationReference | |||||
4 | ReferencedSource | IfcClassificationReferenceSelect | [0:1] | The classification system or source that is referenced. | X |
5 | Description | IfcText | [0:1] | Description of the classification reference for informational purposes. | X |
6 | Sort | IfcIdentifier | [0:1] | Optional identifier to sort the set of classification references within the referenced source (either a classification facet of higher level, or the classification system itself). | X |
ClassificationRefForObjects | IfcRelAssociatesClassification @RelatingClassification | S[0:?] | The classification reference with which objects are associated. | X | |
HasReferences | IfcClassificationReference @ReferencedSource | S[0:?] | The parent classification references to which this child classification reference applies. It can either be the final classification item leaf node, or an intermediate classification item. | X |
<xs:element name="IfcClassificationReference" type="ifc:IfcClassificationReference" substitutionGroup="ifc:IfcExternalReference" nillable="true"/>
<xs:complexType name="IfcClassificationReference">
<xs:complexContent>
<xs:extension base="ifc:IfcExternalReference">
<xs:sequence>
<xs:element name="HasReferences" nillable="true" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcClassificationReference" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcClassificationReference"/>
<xs:attribute ref="ifc:cType" fixed="set"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="Description" type="ifc:IfcText" use="optional"/>
<xs:attribute name="Sort" type="ifc:IfcIdentifier" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcClassificationReference
SUBTYPE OF (IfcExternalReference);
ReferencedSource : OPTIONAL IfcClassificationReferenceSelect;
Description : OPTIONAL IfcText;
Sort : OPTIONAL IfcIdentifier;
INVERSE
ClassificationRefForObjects : SET [0:?] OF IfcRelAssociatesClassification FOR RelatingClassification;
HasReferences : SET [0:?] OF IfcClassificationReference FOR ReferencedSource;
END_ENTITY;