IfcDocumentReference
IfcDocumentReference
实体定义
IfcDocumentReference是对文档位置的引用。引用由系统可解释的位置属性(URL字符串)和可选的继承内部引用标识给出,该属性指的是文档中的系统可解释位置。可选的继承名称属性对人类读者具有意义。可选的文档元数据也可以通过引用IfcDocumentInformation来捕获。
IFC2.0中的新实体
Formal Propositions
Rule | Description |
---|---|
WR1 | A name should only be given, if no document information (including the document name) is attached |
Attribute inheritance
# | 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 | |
IfcDocumentReference | |||||
4 | Description | IfcText | [0:1] | Description of the document reference for informational purposes. | X |
5 | ReferencedDocument | IfcDocumentInformation | [0:1] | The document that is referenced. | X |
DocumentRefForObjects | IfcRelAssociatesDocument @RelatingDocument |
S[0:?] | The document reference with which objects are associated. | X |
EXPRESS Specification
ENTITY IfcDocumentReference
SUBTYPE OF (IfcExternalReference);
Description : OPTIONAL IfcText;
ReferencedDocument : OPTIONAL IfcDocumentInformation;
INVERSE
DocumentRefForObjects : SET OF IfcRelAssociatesDocument FOR RelatingDocument;
WHERE
WR1 : EXISTS(Name) XOR EXISTS(ReferencedDocument);
END_ENTITY;
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