IFC 4.3.x development

8.12.3.12 IfcExternallyDefinedSurfaceStyle

8.12.3.12.1 Semantic definitions at the entity

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.

# Attribute Type Description
IfcExternalReference
1 Location OPTIONAL 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

> .
2 Identification OPTIONAL 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.

>
3 Name OPTIONAL 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).
ExternalReferenceForResourcesSET [0:?] OF IfcExternalReferenceRelationship FOR RelatingReferenceReference 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.

>

8.12.3.12.1 Entity inheritance

dot_inheritance IfcExternallyDefinedSurfaceStyle IfcExternallyDefinedSurfaceStyle IfcExternalReference IfcExternalReference IfcExternallyDefinedSurfaceStyle->IfcExternalReference IfcExternalReference_children 5 more... IfcExternalReference_children->IfcExternalReference

8.12.3.12.2 Formal representations

ENTITY IfcExternallyDefinedSurfaceStyle
 SUBTYPE OF (IfcExternalReference);
END_ENTITY;