IfcAlignment2DVerSegLine

Natural language names
Alignment 2D Vertical Segment Line
Change log
ItemSPFXMLChangeDescription
IFC4x1 Final 4.1.0.0
    IfcAlignment2DVerSegLineADDED
IFC4x1 Final 4.1.0.0
    IfcAlignment2DVerSegLineADDED
Semantic definitions at the entity
Entity definition

The vertical straight segment is defined as a line using the inherited attributes from IfcAlignment2DVerticalSegment.

Inherited definitions from supertypes
Entity inheritance IfcAlignment2DVerticalSegment IfcAlignment2DSegment 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
IfcAlignment2DSegment
1TangentialContinuityIfcBoolean? Connectivity between the continuous segments is not enforced per se to be tangential. Setting "TangentialContinuity" to True means that the current segment shall continue with tangential continuity to the previous one. X
2StartTagIfcLabel? Tag to annotate the start point of the alignment segment. X
3EndTagIfcLabel? Tag to annotate the end point of the alignment segment. X
IfcAlignment2DVerticalSegment
4StartDistAlongIfcLengthMeasure Distance along the horizontal alignment, measured along the IfcAlignment2DHorizontal given in the length unit of the global IfcUnitAssignment. X
5HorizontalLengthIfcPositiveLengthMeasure Length measured as distance along the horizontal alignment of the segment. X
6StartHeightIfcLengthMeasure Elevation in Z of the start point relative to the IfcAlignment coordinate system.
NOTE  It is strongly advised to not offset the IfcAlignment coordinate system from the project engineering coordinate system.
X
7StartGradientIfcRatioMeasure Gradient of the tangent of the vertical segment at the start point. It is provided as a ratio measure. The ratio is percentage/100 (0.1 is equal to 10%). It has a theoretical range of -∞ < n < ∞ using a ratio measure. The equivalent range measured in degree is -90° < n < 90°.
NOTE  For practical application of start gradient, the range of the ratio measure should be within the limits of -1 ≤ n ≤ 1 (equivalent in degree -45° ≤ n ≤ 45°). However larger limits might apply for particular usages.
Positive gradient means an increasing height at the start (or uphill), a negative gradient means decreasing height at the start (or downhill).
X
ToVerticalIfcAlignment2DVertical
@Segments
S[1:1]X
IfcAlignment2DVerSegLine
Formal representations
XML Specification
 <xs:element name="IfcAlignment2DVerSegLine" type="ifc:IfcAlignment2DVerSegLine" substitutionGroup="ifc:IfcAlignment2DVerticalSegment" nillable="true"/>
 <xs:complexType name="IfcAlignment2DVerSegLine">
  <xs:complexContent>
   <xs:extension base="ifc:IfcAlignment2DVerticalSegment"/>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcAlignment2DVerSegLine
 SUBTYPE OF (IfcAlignment2DVerticalSegment);
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Link to this page  Link to this page