IfcRepresentation

IfcRepresentation

Definition from ISO/CD 10303-42:1992: A representation is one or more representation items that are related in a specified representation context as the representation of some concept.

Definition from IAI: The IfcRepresentation defines the general concept of representing product properties.

NOTE: The definition of this entity relates to the STEP entity representation. Please refer to ISO/IS 10303-43:1994 for the final definition of the formal standard.

ISSUE: See issue and change log for changes made in IFC Release 1.5 and IFC 2x.
HISTORY: New Entity in IFC Release 2.0

EXPRESS specification:

ENTITY IfcRepresentation

SUPERTYPE OF

(IfcShapeRepresentation);

ContextOfItems

IfcRepresentationContext;

RepresentationIdentifier

OPTIONAL IfcLabel;

RepresentationType

OPTIONAL IfcLabel;

Items

SET [1:?] OF IfcRepresentationItem;

INVERSE

OfProductRepresentation

SET [0:1] OF IfcProductRepresentation FOR Representations;

END_ENTITY;

Attribute definitions:

ContextOfItems	:	Definition of the representation context for which the different subtypes of representation are valid.
RepresentationIdentifier	:	The optional identifier of the representation as used within a project.
RepresentationType	:	The description of the type of a representation context. The supported values for context type are to be specified by implementers agreements. Example: For the subtype IfcShapeRepresentation the values can be - 'GeometricSet' - 'SurfaceModel' - 'SolidModel' - 'SweptSolid' - 'Brep' - 'CSG' - 'BoundingBox' - 'SectionedSpine' - 'MappedRepresentation'
Items	:	Set of geometric representation items that are defined for this representation.
OfProductRepresentation	:	Reference to the product shape, for which it is the shape representation.