8.9.3.33 IfcGeometricRepresentationItem

RV ⓘ

AbV ⓘ

ABSTRACT This definition may not be instantiated

8.9.3.33.1 Semantic definition

An IfcGeometricRepresentationItem is the common supertype of all geometric items used within a representation. It is positioned within a geometric coordinate system, directly or indirectly through intervening items.

An indirect reference to a Cartesian point or direction means that a given geometric item references the Cartesian point or direction through one or more intervening geometry or topology items.

8.9.3.33.2 Entity inheritance

8.9.3.33.3 Attributes

#	Attribute	Type	Description
IfcRepresentationItem (2)
	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.

Table 8.9.3.33.A

8.9.3.33.4 Formal representation

ENTITY IfcGeometricRepresentationItem
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcAnnotationFillArea
	,IfcBooleanResult
	,IfcBoundingBox
	,IfcCartesianPointList
	,IfcCartesianTransformationOperator
	,IfcCsgPrimitive3D
	,IfcCurve
	,IfcDirection
	,IfcFaceBasedSurfaceModel
	,IfcFillAreaStyleHatching
	,IfcFillAreaStyleTiles
	,IfcGeometricSet
	,IfcHalfSpaceSolid
	,IfcLightSource
	,IfcPlacement
	,IfcPlanarExtent
	,IfcPoint
	,IfcSectionedSpine
	,IfcSegment
	,IfcShellBasedSurfaceModel
	,IfcSolidModel
	,IfcSurface
	,IfcTessellatedItem
	,IfcTextLiteral
	,IfcVector))
 SUBTYPE OF (IfcRepresentationItem);
END_ENTITY;