8.9.3.45 IfcPlacement

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ABSTRACT This definition may not be instantiated

8.9.3.45.1 Semantic definition

An IfcPlacement is an abstract supertype of placement subtypes that define the location of an item, or an entire shape representation, and provide its orientation. All placement subtypes define right-handed Cartesian coordinate systems and do not allow mirroring.

{ .extDef}

8.9.3.45.2 Entity inheritance

8.9.3.45.3 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.
Click to show 2 hidden inherited attributes Click to hide 2 inherited attributes
IfcPlacement (2)
1	Location	IfcPoint	The geometric position of a reference point, such as the center of a circle, of the item to be located.
*	Dim	IfcDimensionCount	This attribute is formally derived. `Location.Dim` The space dimensionality of this class, derived from the dimensionality of the location.

Table A

8.9.3.45.4 Formal representation

ENTITY IfcPlacement
ABSTRACT SUPERTYPE OF (ONEOF
(IfcAxis1Placement
,IfcAxis2Placement2D
,IfcAxis2Placement3D
,IfcAxis2PlacementLinear))
SUBTYPE OF (IfcGeometricRepresentationItem);
Location : IfcPoint;
DERIVE
Dim : IfcDimensionCount := Location.Dim;
END_ENTITY;