IfcAlignment2DVertical

Natural language names
Alignment 2D Vertical
Change log
ItemSPFXMLChangeDescription
IFC4x1 Final 4.1.0.0
    IfcAlignment2DVerticalADDED
IFC4x1 Final 4.1.0.0
    IfcAlignment2DVerticalADDED
Semantic definitions at the entity
Entity definition

An IfcAlignment2DVertical is a height profile along the horizontal alignment. Points along a vertical alignment have two coordinate values. The first value is the distance along the horizontal alignment, the second value is the height according to the project engineering coordinate system. Based on the context of the project, they are geo-referenced and the height value is convertible into orthogonal height above/below the vertical datum.

NOTE  Georeferencing is provided by IfcMapConversion through the IfcGeometricRepresentationContext defined at IfcProject.

Attribute definitions
#AttributeTypeCardinalityDescription G
1SegmentsIfcAlignment2DVerticalSegmentL[1:?] An ordered list of unique vertical alignment segments, each (but the last) are joint end to start X
ToAlignmentCurveIfcAlignmentCurve
@Vertical
S[1:1]X
Inherited definitions from supertypes
Entity inheritance 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
IfcAlignment2DVertical
1SegmentsIfcAlignment2DVerticalSegmentL[1:?] An ordered list of unique vertical alignment segments, each (but the last) are joint end to start X
ToAlignmentCurveIfcAlignmentCurve
@Vertical
S[1:1]X
Formal representations
XML Specification
 <xs:element name="IfcAlignment2DVertical" type="ifc:IfcAlignment2DVertical" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>
 <xs:complexType name="IfcAlignment2DVertical">
  <xs:complexContent>
   <xs:extension base="ifc:IfcGeometricRepresentationItem">
    <xs:sequence>
     <xs:element name="Segments">
      <xs:complexType>
       <xs:sequence>
        <xs:element ref="ifc:IfcAlignment2DVerticalSegment" maxOccurs="unbounded"/>
       </xs:sequence>
       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcAlignment2DVerticalSegment"/>
       <xs:attribute ref="ifc:cType" fixed="list"/>
       <xs:attribute ref="ifc:arraySize" use="optional"/>
      </xs:complexType>
     </xs:element>
    </xs:sequence>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcAlignment2DVertical
 SUBTYPE OF (IfcGeometricRepresentationItem);
  Segments : LIST [1:?] OF IfcAlignment2DVerticalSegment;
 INVERSE
  ToAlignmentCurve : SET [1:1] OF IfcAlignmentCurve FOR Vertical;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcAlignment2DVerticalSegment IfcAlignmentCurve

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