IFCPRESENTATIONDEFINITIONRESOURCE

The data model consists of the following:

The schema IfcPresentationDefinitionResource defines the resources used for geometric representations and presentations of styled items. The primary application of this resource is for defining the annotation occurrences of curve, text, filled area, symbol, and surfaces and the definitions of symbols and text literals for being presented.

NOTE: The definitions of this resource of the IFC model have been taken from the International Standard 10303: "Industrial automation systems and integration - Product data representation and exchange", Part 46 "Integrated generic resources: Visual presentation". The reference of the final international standard is ISO/IS 10303-46:1994. The IfcPresentationDefinitionResource refers to the clause 5, "Presentation definition" of the standard.

The definitions taken from ISO/IS 10303-46:1994 have undergone a adaptation process, characterized by:

• adaptation of the IFC naming convention (inner majuscules and Ifc prefix)
• adaptation of the STEP entities, where multiple inheritance or non-exclusive inheritance (i.e. AND or ANDOR subtype constraints) are used
• selection of a subset of the IR, using subtype and select pruning
• dimensionality of geometric representation items defined at each item (not through the representation context)
• omission of the name attribute at the representation item

The semantic definitions of IfcPresentationDefinitionResource are defined following the adaptation of the ISO/CD 10303-46:1992, Industrial Automation Systems and Integration: Product Data Representation and Exchange - Part 46: Integrated Generic Resources. Visual presentation. The type, class, and function semantic definition sections follow the adapted wording of the working draft, which is clearly indicated and quoted at each reference.

The definitions of all parts of the IfcPresentationDefinitionResource, that are taken from ISO10303-46 are explicitly excluded from the copyright of the International Alliance of Interoperability.

NOTE: For more information on the definitions as defined in the formal ISO standard please refer to: ISO/IS 10303-46:1994, Industrial Automation Systems and Integration: Product Data Representation and Exchange - Part 46: Integrated generic resources: Visual presentation. The formal standard can be obtained through the local publishers of standards in each individual country.

The following is within the scope of the current versions of the presentation resources:

• definition of presentation style attributes for realistic and symbolic visualizations of geometric and non-geometric displayble elements in the product information, including presentation styles for
  • curve
  • text
  • filled area
  • symbol
  • surface
• support of externally defined character fonts and symbols;
• support of pre defined character fonts and symbols;
• image control by a layer mechanism.

Interfaced schemas (7):

Entities (18):

	IfcAnnotationCurveOccurrence
	IfcAnnotationFillArea
	IfcAnnotationFillAreaOccurrence
	IfcAnnotationOccurrence
	IfcAnnotationSurface
	IfcAnnotationSurfaceOccurrence
	IfcAnnotationSymbolOccurrence
	IfcAnnotationTextOccurrence
	IfcDefinedSymbol
	IfcExternallyDefinedSymbol
	IfcPreDefinedSymbol
	IfcTextLiteral
	IfcTextLiteralWithExtent
	IfcTextureCoordinate
	IfcTextureCoordinateGenerator
	IfcTextureMap
	IfcTextureVertex
	IfcVertexBasedTextureMap

Defined types (1):

IfcBoxAlignment

Select types (1):

IfcDefinedSymbolSelect

Enumerations (1):

IfcTextPath