IfcCartesianPointList2D

Item	SPF	XML	Change	Description
IFC4 Addendum 1
IfcCartesianPointList2D			ADDED

Semantic definitions at the entity

Entity definition

The IfcCartesianPointList2D defines an ordered collection of two-dimentional Cartesian points. Each Cartesian point is provided as an two-dimensional point by a fixed list of two coordinates. The attribute CoordList is a two-dimensional list, where

first dimension is an unbounded list representing each 2D Cartesian point;
second dimension is a fixed list of two list members, where [1] is the x-coordinate, and [2] the y-coordinate of the Cartesian point.

NOTE The IfcCartesianPointList2D is introduced to provide a compact representation of larger list of points, such as in indexable representation of points used as vertices in poly curves.

HISTORY New entity in IFC4 ADD1.

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
1	CoordList	IfcLengthMeasure	L[1:?]L[2:2]	Two-dimensional list of Cartesian points provided by two coordinates.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
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.	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.	X
IfcGeometricRepresentationItem
IfcCartesianPointList
	Dim :=IfcPointListDim(SELF)	IfcDimensionCount	[1:1]	The space dimensionality of this class, either 2 or 3, depending on the sub type.	X
IfcCartesianPointList2D
1	CoordList	IfcLengthMeasure	L[1:?]L[2:2]	Two-dimensional list of Cartesian points provided by two coordinates.	X

Formal representations

XSD Specification

 <xs:element name="IfcCartesianPointList2D" type="ifc:IfcCartesianPointList2D" substitutionGroup="ifc:IfcCartesianPointList" nillable="true"/>

 <xs:complexType name="IfcCartesianPointList2D">

  <xs:complexContent>

   <xs:extension base="ifc:IfcCartesianPointList">

    <xs:attribute name="CoordList" use="optional">

     <xs:simpleType>

      <xs:restriction>

       <xs:simpleType>

        <xs:list itemType="ifc:IfcLengthMeasure"/>

       </xs:simpleType>

       <xs:minLength value="2"/>

      </xs:restriction>

     </xs:simpleType>

    </xs:attribute>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcCartesianPointList2D

 SUBTYPE OF (IfcCartesianPointList);

  CoordList : LIST [1:?] OF LIST [2:2] OF IfcLengthMeasure;

END_ENTITY;

 EXPRESS-G diagram