注：定义根据ISO/CD 10303-42:1992

拓扑表示项是几何资源中所有拓扑表示项的超类型。

注：实体改编自ISO 10303-42中定义的拓扑表示项。

IFC1.5中增加的新实体

 

 

#	Attribute	Type	Cardinality	Description	C
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @AssignedItems	S[0:1]	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.	X
	StyledByItem	IfcStyledItem @Item	S[0:1]	Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.	X
IfcTopologicalRepresentationItem

 

EXPRESS Specification

ENTITY IfcTopologicalRepresentationItem
 ABSTRACT SUPERTYPE OF(ONEOF(IfcConnectedFaceSet, IfcEdge, IfcFace, IfcFaceBound, IfcLoop, IfcPath, IfcVertex))
 SUBTYPE OF (IfcRepresentationItem);
END_ENTITY;