IfcAlignmentCurve

Natural language names
Alignment Curve
Change log
ItemSPFXMLChangeDescription
IFC4x1 Release Candidate 2
    IfcAlignmentCurveADDED
IFC4x2 FINAL
    IfcAlignmentCurve
      PositioningElementADDED
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
#AttributeTypeCardinalityDescription G
1HorizontalIfcAlignment2DHorizontal The horizontal component of the curve.X
2VerticalIfcAlignment2DVertical? The vertical component of the curve, which is defined relative to the horizontal curve.X
3TagIfcLabel? Optional identifier of the curve, which may be used to correlate points from a variable cross-section.X
Inherited definitions from supertypes
Entity inheritance IfcBoundedCurve IfcCurve IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRepresentationItem
LayerAssignmentIfcPresentationLayerAssignment
@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
StyledByItemIfcStyledItem
@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)
IfcDimensionCountThe space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve. X
IfcBoundedCurve
PositioningElementIfcLinearPositioningElement
@Axis
? X
IfcAlignmentCurve
1HorizontalIfcAlignment2DHorizontal The horizontal component of the curve.X
2VerticalIfcAlignment2DVertical? The vertical component of the curve, which is defined relative to the horizontal curve.X
3TagIfcLabel? Optional identifier of the curve, which may be used to correlate points from a variable cross-section.X
Examples
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;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcAlignment2DHorizontal IfcAlignment2DVertical

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