IfcExternallyDefinedSurfaceStyle是通过引用外部源（例如用于渲染信息的材质库）来定义曲面样式。

注：为了获得预期的结果，外部定义的曲面样式通常只能在显式定义的曲面样式之外给出。

IFC2x2中增加的新实体。

IFC2x3更改：IfcExternallyDefinedSuffaceStyle更正，没有向上兼容性。

 

 

 

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
IfcExternallyDefinedSurfaceStyle

 

 

EXPRESS Specification

ENTITY IfcExternallyDefinedSurfaceStyle
 SUBTYPE OF (IfcExternalReference);
END_ENTITY;