IfcAlignmentCurve

Item	SPF	XML	Change	Description
IFC4x1 Release Candidate 2
IfcAlignmentCurve			ADDED

Semantic definitions at the entity

Entity definition

An IfcAlignmentCurve describes a 3D curve based on a 2D vertical curve defined along the path of a 2D horizontal curve.

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
1	Horizontal	IfcAlignment2DHorizontal		The horizontal component of the curve.	X
2	Vertical	IfcAlignment2DVertical	?	The vertical component of the curve, which is defined relative to the horizontal curve.	X
3	Tag	IfcLabel	?	Optional identifier of the curve, which may be used to correlate points from a variable cross-section.	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
IfcBoundedCurve
IfcAlignmentCurve
1	Horizontal	IfcAlignment2DHorizontal		The horizontal component of the curve.	X
2	Vertical	IfcAlignment2DVertical	?	The vertical component of the curve, which is defined relative to the horizontal curve.	X
3	Tag	IfcLabel	?	Optional identifier of the curve, which may be used to correlate points from a variable cross-section.	X

Formal representations

XML Specification

 <xs:element name="IfcAlignmentCurve" type="ifc:IfcAlignmentCurve" substitutionGroup="ifc:IfcBoundedCurve" nillable="true"/>

 <xs:complexType name="IfcAlignmentCurve">

  <xs:complexContent>

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

    <xs:sequence>

     <xs:element name="Horizontal" type="ifc:IfcAlignment2DHorizontal" nillable="true"/>

     <xs:element name="Vertical" type="ifc:IfcAlignment2DVertical" nillable="true" minOccurs="0"/>

    </xs:sequence>

    <xs:attribute name="Tag" type="ifc:IfcLabel" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcAlignmentCurve

 SUBTYPE OF (IfcBoundedCurve);

  Horizontal : IfcAlignment2DHorizontal;

  Vertical : OPTIONAL IfcAlignment2DVertical;

  Tag : OPTIONAL IfcLabel;

END_ENTITY;

 EXPRESS-G diagram

IfcAlignmentCurve

Semantic definitions at the entity

Inherited definitions from supertypes

Examples

Formal representations