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;