IfcAlignment2DSegment

Item	SPF	XML	Change	Description
IFC4x1 Release Candidate 1
IfcAlignment2DSegment			ADDED

Semantic definitions at the entity

Entity definition

An abstract entity defining common information about horizontal and vertical alignment segments.

NOTE The start and end tag are defined as annotations, not as referents along the alignment. Only absolute distance expressions are in scope, not distances ahead or behind a referent, such as a station. However such information can be exchanged as tags.

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
1	TangentialContinuity	IfcBoolean	?	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
2	StartTag	IfcLabel	?	Tag to annotate the start point of the alignment segment.	X
3	EndTag	IfcLabel	?	Tag to annotate the end point of the alignment segment.	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
IfcAlignment2DSegment
1	TangentialContinuity	IfcBoolean	?	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
2	StartTag	IfcLabel	?	Tag to annotate the start point of the alignment segment.	X
3	EndTag	IfcLabel	?	Tag to annotate the end point of the alignment segment.	X

Formal representations

XML Specification

 <xs:element name="IfcAlignment2DSegment" type="ifc:IfcAlignment2DSegment" abstract="true" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>

 <xs:complexType name="IfcAlignment2DSegment" abstract="true">

  <xs:complexContent>

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

    <xs:attribute name="TangentialContinuity" type="ifc:IfcBoolean" use="optional"/>

    <xs:attribute name="StartTag" type="ifc:IfcLabel" use="optional"/>

    <xs:attribute name="EndTag" type="ifc:IfcLabel" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcAlignment2DSegment

 ABSTRACT SUPERTYPE OF(ONEOF(IfcAlignment2DHorizontalSegment, IfcAlignment2DVerticalSegment))

 SUBTYPE OF (IfcGeometricRepresentationItem);

  TangentialContinuity : OPTIONAL IfcBoolean;

  StartTag : OPTIONAL IfcLabel;

  EndTag : OPTIONAL IfcLabel;

END_ENTITY;

 EXPRESS-G diagram