IfcAlignment2DHorizontalSegment

Natural language names
Alignment Curve 2D Horizontal Segment
Change log
ItemSPFXMLChangeDescription
IFC4x1 Final 4.1.0.0
    IfcAlignment2DHorizontalSegmentADDED
IFC4x1 Final 4.1.0.0
    IfcAlignment2DHorizontalSegmentADDED
Semantic definitions at the entity
Entity definition

Individual segment along the IfcAlignment2DHorizontal, being defined in the x/y coordinate space. Each single horizontal alignment segment has an associated curve geometry. The following segment curve types are defined by the CurveGeometry:

For each horizontal segment, the following non-redundant information is provided:

The following information can be calculated (and is therefore not exchanged explicitly to avoid redundancy and inconsistencies)

The following checks can be done to validate the correct exchange:

Attribute definitions
#AttributeTypeCardinalityDescription G
4CurveGeometryIfcCurveSegment2D Geometric representation of the horizontal alignment within the 2D X/Y coordinate space. X
ToHorizontalIfcAlignment2DHorizontal
@Segments
S[1:1]X
Inherited definitions from supertypes
Entity inheritance IfcAlignment2DSegment 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
IfcAlignment2DHorizontalSegment
4CurveGeometryIfcCurveSegment2D Geometric representation of the horizontal alignment within the 2D X/Y coordinate space. X
ToHorizontalIfcAlignment2DHorizontal
@Segments
S[1:1]X
Formal representations
XML Specification
 <xs:element name="IfcAlignment2DHorizontalSegment" type="ifc:IfcAlignment2DHorizontalSegment" substitutionGroup="ifc:IfcAlignment2DSegment" nillable="true"/>
 <xs:complexType name="IfcAlignment2DHorizontalSegment">
  <xs:complexContent>
   <xs:extension base="ifc:IfcAlignment2DSegment">
    <xs:sequence>
     <xs:element name="CurveGeometry" type="ifc:IfcCurveSegment2D" nillable="true"/>
    </xs:sequence>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcAlignment2DHorizontalSegment
 SUBTYPE OF (IfcAlignment2DSegment);
  CurveGeometry : IfcCurveSegment2D;
 INVERSE
  ToHorizontal : SET [1:1] OF IfcAlignment2DHorizontal FOR Segments;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcAlignment2DHorizontal

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