IfcPoint

Semantic definitions at the entity

Entity definition

The IfcPoint is the abstract generalisation of all point representations within a Cartesian coordinate system.

NOTE Definition according to ISO/CD 10303-42:1992
A point is a location in some real Cartesian coordinate space R^m, for m = 1, 2 or 3.

NOTE Entity adapted from point in ISO 10303-42.

HISTORY New entity in IFC1.5

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
	Dim :=IfcPointDim(SELF)	IfcDimensionCount		The space dimensionality of this abstract class, handled by a function specific for concrete subtypes. Determined by the number of coordinate components in case of IfcCartesianPoint or by the dimensionality of the basis curve or surface in other cases.	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
IfcPoint
	Dim :=IfcPointDim(SELF)	IfcDimensionCount		The space dimensionality of this abstract class, handled by a function specific for concrete subtypes. Determined by the number of coordinate components in case of IfcCartesianPoint or by the dimensionality of the basis curve or surface in other cases.	X

Formal representations

XML Specification

 <xs:element name="IfcPoint" type="ifc:IfcPoint" abstract="true" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>

 <xs:complexType name="IfcPoint" abstract="true">

  <xs:complexContent>

   <xs:extension base="ifc:IfcGeometricRepresentationItem"/>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcPoint

 ABSTRACT SUPERTYPE OF(ONEOF(IfcCartesianPoint, IfcPointByDistanceExpression, IfcPointOnCurve, IfcPointOnSurface))

 SUBTYPE OF (IfcGeometricRepresentationItem);

 DERIVE

  Dim : IfcDimensionCount := IfcPointDim(SELF);

END_ENTITY;

 EXPRESS-G diagram

	Punkt
	Point
	Point