#CV-2x3-106

Description

each IFC model shall have a maximum of 2 (and minimum of 1) instances of IfcGeometricRepresentationContext. The conventions to use the ContextType attributes are:

• IfcGeometricRepresentationContext.ContextType = 'Model' for all but annotations
• IfcGeometricRepresentationContext.ContextType = 'Plan' for annotations

Differentiation of Model representation context (to allow a better structured export) is supported by using IfcGeometricRepresentationSubContext. The conventions to use the ContextType attributes are:

• an IfcGeometricRepresentationContext.ContextType = 'Model' may have subcontexts.
  • the IfcGeometricRepresentationSubContext.ContextIdentifier should be: 'BoundingBox', 'Box', 'Axis', 'FootPrint', 'Profile', 'Body'
  • it refers to the IfcShapeRepresentation.RepresentationIdentifier of the included object geometry
    

[added 05-May-06] Differentiation of Plan representation context (to allow a better structured export) is supported by using IfcGeometricRepresentationSubContext. The conventions to use the ContextType attributes are:

• an IfcGeometricRepresentationContext.ContextType = 'Plan' may have subcontexts.
  • the IfcGeometricRepresentationSubContext.ContextIdentifier should be: 'Plan', 'Annotation'

• required information (to allow the scaling of annotations, like line types, hatching, text) is the TargetScale attribute, it always has to be provided.
  
• the TargetView attribute is always set to .PLAN_VIEW.