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IfcSubedge

Definition from ISO/DIS 10303-42:1999(E): 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.

Informal propositions:

  1. The domain of the subedge is formally defined to be the domain of the parent edge, as trimmed by the subedge start vertex and subedge end vertex.
  2. The start vertex and end vertex shall be within the union of the domains of the vertices of the parent edge and the domain of the parent edge.
NOTE: Corresponding STEP entity: subedge. Please refer to ISO/DIS 10303-42:1999(E), p. 194 for the final definition of the formal standard.
HISTORY: New entity in Release IFC 2x Edition 2.

EXPRESS specification:

ENTITY IfcSubedge
SUBTYPE OF ( IfcEdge);
ParentEdge  :  IfcEdge;
END_ENTITY;

Attribute definitions:

ParentEdge  :  The Edge, or Subedge, which contains the Subedge.

Inheritance graph

ENTITY IfcSubedge;
ENTITY IfcRepresentationItem;
INVERSE
LayerAssignments  :  SET OF IfcPresentationLayerAssignment FOR AssignedItems;
StyledByItem  :  SET [0:1] OF IfcStyledItem FOR Item;
ENTITY IfcTopologicalRepresentationItem;
ENTITY IfcEdge;
EdgeStart  :  IfcVertex;
EdgeEnd  :  IfcVertex;
ENTITY IfcSubedge;
ParentEdge  :  IfcEdge;
END_ENTITY;