NOTE Definition according to ISO/CD 10303-42:1992
An edge_loop is a loop with nonzero extent. It is a path in which the start and end vertices are the same. Its domain, if present, is a closed curve. An edge_loop may overlap itself.
NOTE Entity adapted from edge_loop 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||EdgeList||LIST [1:?] OF IfcOrientedEdge||A list of oriented edge entities which are concatenated together to form this path.|
|Ne||INVALID||The number of elements in the edge list.|
ENTITY IfcEdgeLoop SUBTYPE OF (IfcLoop); EdgeList : LIST [1:?] OF IfcOrientedEdge; DERIVE Ne : IfcInteger := SIZEOF(EdgeList); WHERE IsClosed : (EdgeList.EdgeStart) :=: (EdgeList[Ne].EdgeEnd); IsContinuous : IfcLoopHeadToTail(SELF); END_ENTITY;