IfcCartesianPointList2D

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	G
1	CoordList	IfcLengthMeasure	L[1:?] L[2:2]	Two-dimensional list of Cartesian points provided by two coordinates.	X
2	TagList	IfcLabel	? L[1:?]	List of tags corresponding to each point that may be used to identify a basis curve according to the Tag attribute at IfcOffsetCurveByDistances or IfcAlignmentCurve.	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
IfcCartesianPointList
	Dim :=IfcPointListDim(SELF)	IfcDimensionCount		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
2	TagList	IfcLabel	? L[1:?]	List of tags corresponding to each point that may be used to identify a basis curve according to the Tag attribute at IfcOffsetCurveByDistances or IfcAlignmentCurve.	X

Formal representations

XML 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:attribute name="TagList" use="optional">

     <xs:simpleType>

      <xs:restriction>

       <xs:simpleType>

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

       </xs:simpleType>

      </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;

  TagList : OPTIONAL LIST [1:?] OF IfcLabel;

END_ENTITY;

 EXPRESS-G diagram

Item	SPF	XML	Change	Description
IFC4 Addendum 1
IfcCartesianPointList2D			ADDED
IFC4x1 Release Candidate 3
IfcCartesianPointList2D
TagList			ADDED