8.9.3.61 IfcSegment

RV ⓘ

AbV ⓘ

ABSTRACT This definition may not be instantiated

8.9.3.61.1 Semantic definition

Definition of a curve segment with a trimming mechanism built in with a StartPlacement (first point) and SegmentLength (second point).

8.9.3.61.2 Entity inheritance

8.9.3.61.3 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
IfcSegment (3)
1	Transition	IfcTransitionCode	The state of transition (i.e., geometric continuity from the last point of this segment to the first point of the next segment) in IfcCompositeCurve and subtypes.
	UsingCurves	SET [1:?] OF IfcCompositeCurve FOR Segments	The set of composite curves which use this composite curve segment as a segment. This set shall not be empty.
*	Dim	IfcDimensionCount	This attribute is formally derived. `IfcSegmentDim(SELF)` The space dimensionality of this abstract class, handled by a function specific for concrete subtypes which returns the dimensionality of the ParentCurve attribute (defined on both subtypes).

Table 8.9.3.61.A

8.9.3.61.4 Formal representation

ENTITY IfcSegment
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcCompositeCurveSegment
	,IfcCurveSegment))
 SUBTYPE OF (IfcGeometricRepresentationItem);
	Transition : IfcTransitionCode;
 DERIVE
	Dim : IfcDimensionCount := IfcSegmentDim(SELF);
 INVERSE
	UsingCurves : SET [1:?] OF IfcCompositeCurve FOR Segments;
END_ENTITY;