modifications | abstract | Changed from False to True |

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_surfacedefined in ISO10303-42.HISTORY New entity in IFC2x

IFC4 CHANGE Entity made abstract.

Informal Propositions:

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

# | Attribute | Type | Description |
---|---|---|---|

IfcRepresentationItem | |||

LayerAssignment | SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems | Assignment 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. |

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