IfcDocumentReference

Natural language names
Bezug auf Dokument
Document Reference
Référence à un document
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4 4.0.0.0
    IfcDocumentReference
      LocationMODIFIEDType changed from IfcLabel to IfcURIReference.
      IdentificationXMODIFIEDName changed from ItemReference to Identification.
      DescriptionADDED
      ReferencedDocumentADDED
Semantic definitions at the entity
Entity definition

An IfcDocumentReference is a reference to the location of a document. The reference is given by a system interpretable Location attribute (a URL string) where the document can be found, and an optional inherited internal reference Identification, which refers to a system interpretable position within the document. The optional inherited Name attribute is meant to have meaning for human readers. Optional document metadata can also be captured through reference to IfcDocumentInformation.

HISTORY  New entity in IFC2.0

Attribute definitions
#AttributeTypeCardinalityDescription G
4DescriptionIfcText? Description of the document reference for informational purposes.
IFC4 CHANGE  New attribute added at the end of the attribute list.
X
5ReferencedDocumentIfcDocumentInformation? Information about the referenced document. X
DocumentRefForObjectsIfcRelAssociatesDocument
@RelatingDocument
S[0:?]The document reference with which objects are associated.
IFC4 CHANGE  New inverse attribute.
X
Formal Propositions
RuleDescription
WR1A name should only be given, if no document information (including the document name) is attached
Inherited definitions from supertypes
Entity inheritance IfcExternalReference
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcExternalReference
1LocationIfcURIReference? 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.
IFC4 CHANGE  The data type has been changed from IfcLabel to IfcURIReference
.
X
2IdentificationIfcIdentifier? The Identification provides a unique identifier of the referenced item within the external source (classification, document or library). It may be provided as
  • a key, e.g. a classification notation, like NF2.3
  • a handle
  • a uuid or guid
It may be human readable (such as a key) or not (such as a handle or uuid) depending on the context of its usage (which has to be determined by local agreement).
IFC4 CHANGE Attribute renamed from ItemReference for consistency.
X
3NameIfcLabel? 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
ExternalReferenceForResourcesIfcExternalReferenceRelationship
@RelatingReference
S[0:?]Reference to all associations between this external reference and objects within the IfcResourceObjectSelect that are tagged by the external reference.
IFC4 CHANGE  New inverse attribute added with upward compatibility.
X
IfcDocumentReference
4DescriptionIfcText? Description of the document reference for informational purposes.
IFC4 CHANGE  New attribute added at the end of the attribute list.
X
5ReferencedDocumentIfcDocumentInformation? Information about the referenced document. X
DocumentRefForObjectsIfcRelAssociatesDocument
@RelatingDocument
S[0:?]The document reference with which objects are associated.
IFC4 CHANGE  New inverse attribute.
X
Formal representations
XML Specification
 <xs:element name="IfcDocumentReference" type="ifc:IfcDocumentReference" substitutionGroup="ifc:IfcExternalReference" nillable="true"/>
 <xs:complexType name="IfcDocumentReference">
  <xs:complexContent>
   <xs:extension base="ifc:IfcExternalReference">
    <xs:sequence>
     <xs:element name="ReferencedDocument" type="ifc:IfcDocumentInformation" nillable="true" minOccurs="0"/>
    </xs:sequence>
    <xs:attribute name="Description" type="ifc:IfcText" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcDocumentReference
 SUBTYPE OF (IfcExternalReference);
  Description : OPTIONAL IfcText;
  ReferencedDocument : OPTIONAL IfcDocumentInformation;
 INVERSE
  DocumentRefForObjects : SET [0:?] OF IfcRelAssociatesDocument FOR RelatingDocument;
 WHERE
  WR1 : EXISTS(Name) XOR EXISTS(ReferencedDocument);
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcDocumentInformation IfcDocumentSelect

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