IfcLibraryReference

IfcLibraryReference

实体定义

IfclBraryReference是按位置（作为URI提供）对信息库的引用。它还提供了一个可选的继承标识键，以允许对库节或表进行更具体的引用。继承的名称属性允许对库项进行人工可解释的标识。此外，有关从中获取引用的库的一般信息由ReferencedLibrary关系提供，该关系标识了IfcLibraryInformation的相关事件。

 

ifcLibraryReference还提供了处理多语言库条目的功能。然后，语言属性保存名称和描述属性中保留的字符串所使用语言的语言标记。

 

IFC2.0中的新实体。

增加IFC4变更描述和语言属性；添加了ReferencedLibrary属性（与先前的ReferenceIntoLibrary反向关系相反）。

 

 

 

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 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).	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
IfcLibraryReference
4	Description	IfcText	[0:1]	Additional description provided for the library reference.	X
5	Language	IfcLanguageId	[0:1]	The language in which a library reference is expressed.	X
6	ReferencedLibrary	IfcLibraryInformation	[0:1]	The library information that is being referenced.	X
	LibraryRefForObjects	IfcRelAssociatesLibrary @RelatingLibrary	S[0:?]	The library reference with which objects are associated.	X

 

EXPRESS Specification

ENTITY IfcLibraryReference
 SUBTYPE OF (IfcExternalReference);
  Description : OPTIONAL IfcText;
  Language : OPTIONAL IfcLanguageId;
  ReferencedLibrary : OPTIONAL IfcLibraryInformation;
 INVERSE
  LibraryRefForObjects : SET [0:?] OF IfcRelAssociatesLibrary FOR RelatingLibrary;
END_ENTITY;

 

 

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