NOTE Definition according to ISO/CD 10303-42:1992
A subedge is an edge whose domain is a connected portion of the domain of an existing edge. The topological constraints on a subedge are the same as those on an edge.
NOTE Entity adapted from subedge defined in ISO 10303-42.
HISTORY New entity in IFC2x2.
|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.
|1||EdgeStart||IfcVertex||Start point (vertex) of the edge.|
|2||EdgeEnd||IfcVertex||End point (vertex) of the edge. The same vertex can be used for both EdgeStart and EdgeEnd.|
|3||ParentEdge||IfcEdge||The Edge, or Subedge, which contains the Subedge.|
ENTITY IfcSubedge SUBTYPE OF (IfcEdge); ParentEdge : IfcEdge; END_ENTITY;