注：定义符合ISO/CD 10303-46:1992

外部定义的文本字体是对文本字体的外部引用

注：实施指南可能会暴露字体源和要使用的字体名称的限制。

注意对应的ISO 10303名称：外部定义的文本字体。正式标准的最终定义请参考ISO/IS 10303-46:1994，第137页。

IFC2x2中增加的新实体。

 

 

 

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
IfcExternallyDefinedTextFont

 

EXPRESS Specification

ENTITY IfcExternallyDefinedTextFont
 SUBTYPE OF (IfcExternalReference);
END_ENTITY;