IfcExternallyDefinedSurfaceStyle

Item	XML	Change	Description
IFC2x3 to IFC4
IfcExternallyDefinedSurfaceStyle
Location		MODIFIED	Type changed from IfcLabel to IfcURIReference.
Identification	X	MODIFIED	Name changed from ItemReference to Identification.

Semantic definitions at the entity

Entity definition

IfcExternallyDefinedSurfaceStyle is a definition of a surface style through referencing an external source, such as a material library for rendering information.

NOTE In order to achieve expected results, the externally defined surface style should normally only be given in addition to an explicitly defined surface styles.

HISTORY New entity in IFC2x2.

IFC2x3 CHANGE The spelling has been corrected from IfcExternallyDefinedSufaceStyle with no upward compatibility.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcExternalReference
1	Location	IfcURIReference	?	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
2	Identification	IfcIdentifier	?	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
3	Name	IfcLabel	?	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. IFC4 CHANGE New inverse attribute added with upward compatibility.	X
IfcExternallyDefinedSurfaceStyle

Formal representations

XML Specification

 <xs:element name="IfcExternallyDefinedSurfaceStyle" type="ifc:IfcExternallyDefinedSurfaceStyle" substitutionGroup="ifc:IfcExternalReference" nillable="true"/>

 <xs:complexType name="IfcExternallyDefinedSurfaceStyle">

  <xs:complexContent>

   <xs:extension base="ifc:IfcExternalReference"/>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcExternallyDefinedSurfaceStyle

 SUBTYPE OF (IfcExternalReference);

END_ENTITY;

 EXPRESS-G diagram

	Extern definiert - Oberflächenstil
	Externally Defined Surface Style