IfcOffsetCurve

Item	SPF	XML	Change	Description
IFC4x1 Release Candidate 3
IfcOffsetCurve			ADDED

Semantic definitions at the entity

Entity definition

An IfcOffsetCurve is an abstract entity describing a curve that is defined relative to another curve according to an offset that may be constant or variable along the referenced curve.

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
1	BasisCurve	IfcCurve		The curve that is being offset.	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
IfcCurve
	Dim :=IfcCurveDim(SELF)	IfcDimensionCount		The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.	X
IfcOffsetCurve
1	BasisCurve	IfcCurve		The curve that is being offset.	X

Formal representations

XML Specification

 <xs:element name="IfcOffsetCurve" type="ifc:IfcOffsetCurve" abstract="true" substitutionGroup="ifc:IfcCurve" nillable="true"/>

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

  <xs:complexContent>

   <xs:extension base="ifc:IfcCurve">

    <xs:sequence>

     <xs:element name="BasisCurve" type="ifc:IfcCurve" nillable="true"/>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcOffsetCurve

 ABSTRACT SUPERTYPE OF(ONEOF(IfcOffsetCurve2D, IfcOffsetCurve3D, IfcOffsetCurveByDistances))

 SUBTYPE OF (IfcCurve);

  BasisCurve : IfcCurve;

END_ENTITY;

 EXPRESS-G diagram