IfcSegment

Item	SPF	XML	Change	Description
IFC4x3_RC1 to IFC4x3_RC2
IfcSegment			ADDED

Semantic definitions at the entity

Entity definition

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

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
1	Transition	IfcTransitionCode		Connectivity between the continuous segments is not enforced per se to be tangential. Setting "TangentialContinuity" to True means that the current segment shall continue with tangential continuity to the previous one.	X
	UsingCurves	IfcCompositeCurve @Segments	S[1:?]	The set of composite curves which use this composite curve segment as a segment. This set shall not be empty.	X
	Dim :=IfcSegmentDim(SELF)	IfcDimensionCount		The space dimensionality of this class, defined by the dimensionality of the first ParentCurve.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
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. 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.	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. IFC2x3 CHANGE The inverse attribute StyledByItem has been added.	X
IfcGeometricRepresentationItem
IfcSegment
1	Transition	IfcTransitionCode		Connectivity between the continuous segments is not enforced per se to be tangential. Setting "TangentialContinuity" to True means that the current segment shall continue with tangential continuity to the previous one.	X
	UsingCurves	IfcCompositeCurve @Segments	S[1:?]	The set of composite curves which use this composite curve segment as a segment. This set shall not be empty.	X
	Dim :=IfcSegmentDim(SELF)	IfcDimensionCount		The space dimensionality of this class, defined by the dimensionality of the first ParentCurve.	X

Formal representations

XML Specification

 <xs:element name="IfcSegment" type="ifc:IfcSegment" abstract="true" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>

 <xs:complexType name="IfcSegment" abstract="true">

  <xs:complexContent>

   <xs:extension base="ifc:IfcGeometricRepresentationItem">

    <xs:attribute name="Transition" type="ifc:IfcTransitionCode" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcSegment

 ABSTRACT SUPERTYPE OF(ONEOF(IfcCompositeCurveSegment, IfcCurveSegment))

 SUBTYPE OF (IfcGeometricRepresentationItem);

  Transition : IfcTransitionCode;

 INVERSE

  UsingCurves : SET [1:?] OF IfcCompositeCurve FOR Segments;

 DERIVE

  Dim : IfcDimensionCount := IfcSegmentDim(SELF);

END_ENTITY;

 EXPRESS-G diagram