IfcAlignment2DSegment

Natural language names
Alignment 2D Segment
Change log
ItemSPFXMLChangeDescription
IFC4x1 Final 4.1.0.0
    IfcAlignment2DSegmentADDED
IFC4x1 Final 4.1.0.0
    IfcAlignment2DSegmentADDED
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
#AttributeTypeCardinalityDescription G
1TangentialContinuityIfcBoolean? 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
2StartTagIfcLabel? Tag to annotate the start point of the alignment segment. X
3EndTagIfcLabel? Tag to annotate the end point of the alignment segment. X
Inherited definitions from supertypes
Entity inheritance IfcAlignment2DCantSegment IfcAlignment2DHorizontalSegment IfcAlignment2DVerticalSegment IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRepresentationItem
LayerAssignmentIfcPresentationLayerAssignment
@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
StyledByItemIfcStyledItem
@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
1TangentialContinuityIfcBoolean? 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
2StartTagIfcLabel? Tag to annotate the start point of the alignment segment. X
3EndTagIfcLabel? 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(IfcAlignment2DCantSegment, IfcAlignment2DHorizontalSegment, IfcAlignment2DVerticalSegment))
 SUBTYPE OF (IfcGeometricRepresentationItem);
  TangentialContinuity : OPTIONAL IfcBoolean;
  StartTag : OPTIONAL IfcLabel;
  EndTag : OPTIONAL IfcLabel;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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