IFC 4.3.x development

8.9.3.12 IfcBoundedSurface

Change log

IFC4

modificationsabstractChanged from False to True

8.9.3.12.1 Semantic definitions at the entity

An IfcBoundedSurface is a surface of finite area.

NOTE  Definition according to ISO/CD 10303-42:1992
A bounded surface is a surface of finite area with identifiable boundaries.

NOTE  Entity adapted from bounded_surface defined in ISO10303-42.

HISTORY  New entity in IFC2x

IFC4 CHANGE Entity made abstract.

Informal Propositions:

  1. A bounded surface has finite non-zero surface area.
  2. A bounded surface has boundary curves.

# Attribute Type Description
IfcRepresentationItem
LayerAssignmentSET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItemsAssignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.

> IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added.

> IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
StyledByItem SET [0:1] OF IfcStyledItem FOR Item Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.



> IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
IfcGeometricRepresentationItem
IfcSurface
Dim INVALID The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item.

> IFC4 CHANGE Derived attribute promoted from subtypes.

8.9.3.12.1 Entity inheritance

dot_inheritance IfcBoundedSurface_children 3 more... IfcBoundedSurface IfcBoundedSurface IfcBoundedSurface_children->IfcBoundedSurface IfcSurface IfcSurface IfcBoundedSurface->IfcSurface IfcSurface_children 3 more... IfcSurface_children->IfcSurface IfcGeometricRepresentationItem IfcGeometricRepresentationItem IfcSurface->IfcGeometricRepresentationItem IfcGeometricRepresentationItem_children 24 more... IfcGeometricRepresentationItem_children->IfcGeometricRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcGeometricRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem

8.9.3.12.2 Formal representations

ENTITY IfcBoundedSurface
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcBSplineSurface
	,IfcCurveBoundedPlane
	,IfcCurveBoundedSurface
	,IfcRectangularTrimmedSurface))
 SUBTYPE OF (IfcSurface);
END_ENTITY;