IfcAlignment2DVertical

Item	SPF	XML	Change	Description
IFC4 ADD1 to IFC4x1
IfcAlignment2DVertical			ADDED

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	B
1	Segments	IfcAlignment2DVerticalSegment	L[1:?]	An ordered list of unique vertical alignment segments, each (but the last) are joint end to start	X
	ToAlignment	IfcAlignment @Vertical	S[1:1]	Link to the IfcAlignment for which it defined the vertical alignment. Only one IfcAlignment can be linked, a vertical alignment can not be shared by several alignments.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	B
IfcAlignment2DVertical
1	Segments	IfcAlignment2DVerticalSegment	L[1:?]	An ordered list of unique vertical alignment segments, each (but the last) are joint end to start	X
	ToAlignment	IfcAlignment @Vertical	S[1:1]	Link to the IfcAlignment for which it defined the vertical alignment. Only one IfcAlignment can be linked, a vertical alignment can not be shared by several alignments.

Formal representations

XSD Specification

 <xs:element name="IfcAlignment2DVertical" type="ifc:IfcAlignment2DVertical" substitutionGroup="ifc:Entity" nillable="true"/>

 <xs:complexType name="IfcAlignment2DVertical">

  <xs:complexContent>

   <xs:extension base="ifc:Entity">

    <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;

  Segments : LIST [1:?] OF IfcAlignment2DVerticalSegment;

 INVERSE

  ToAlignment : SET [1:1] OF IfcAlignment FOR Vertical;

END_ENTITY;

 EXPRESS-G diagram