IfcAlignment2DVertical

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

#	Attribute	Type	Cardinality	Description	G
1	Segments	IfcAlignment2DVerticalSegment	L[1:?]	An ordered list of unique vertical alignment segments, each (but the last) are joint end to start	X
	ToAlignmentCurve	IfcAlignmentCurve @Vertical	S[1:1]		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
IfcAlignment2DVertical
1	Segments	IfcAlignment2DVerticalSegment	L[1:?]	An ordered list of unique vertical alignment segments, each (but the last) are joint end to start	X
	ToAlignmentCurve	IfcAlignmentCurve @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;

 EXPRESS-G diagram

Item	SPF	XML	Change	Description
IFC4x1 Release Candidate 1
IfcAlignment2DVertical			ADDED
IFC4x1 Release Candidate 2
IfcAlignment2DVertical
ToAlignmentCurve			ADDED
IFC4x1 Release Candidate 3
IfcAlignment2DVertical
LayerAssignment			ADDED
StyledByItem			ADDED