IfcCompositeCurveSegment

Natural language names
Segment einer zusammengesetzten Kurve
Composite Curve Segment
Segment de courbe composite
Change log
ItemSPFXMLChangeDescription
IFC4 Addendum 1 4.0.1.0
    IfcCompositeCurveSegment
      SameSenseMODIFIEDType changed from BOOLEAN to IfcBoolean.
IFC4 Addendum 1 4.0.1.0
    IfcCompositeCurveSegment
      SameSenseMODIFIEDType changed from BOOLEAN to IfcBoolean.
Semantic definitions at the entity
Entity definition

An IfcCompositeCurveSegment is a bounded curve constructed for the sole purpose to be a segment within an IfcCompositeCurve.

NOTE  Definition according to ISO/CD 10303-42:1992
A composite curve segment is a bounded curve together with transition information which is used to construct a composite curve.

NOTE  Entity adapted from composite_curve_segment defined in ISO 10303-42.

HISTORY  New entity in IFC1.0

Attribute definitions
#AttributeTypeCardinalityDescription G
1TransitionIfcTransitionCode The state of transition (i.e., geometric continuity from the last point of this segment to the first point of the next segment) in a composite curve. X
2SameSenseIfcBoolean An indicator of whether or not the sense of the segment agrees with, or opposes, that of the parent curve. If SameSense is false, the point with highest parameter value is taken as the first point of the segment.
NOTE  If the datatype of ParentCurve is IfcTrimmedCurve, the value of SameSense overrides the value of IfcTrimmedCurve.SenseAgreement
X
3ParentCurveIfcCurve The bounded curve which defines the geometry of the segment. X
UsingCurvesIfcCompositeCurve
@Segments
S[1:?]The set of composite curves which use this composite curve segment as a segment. This set shall not be empty. X
Dim
:=ParentCurve.Dim
IfcDimensionCountThe space dimensionality of this class, defined by the dimensionality of the first ParentCurve. X
Formal Propositions
RuleDescription
ParentIsBoundedCurveThe parent curve shall be a bounded curve.
Inherited definitions from supertypes
Entity inheritance IfcReparametrisedCompositeCurveSegment 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
IfcCompositeCurveSegment
1TransitionIfcTransitionCode The state of transition (i.e., geometric continuity from the last point of this segment to the first point of the next segment) in a composite curve. X
2SameSenseIfcBoolean An indicator of whether or not the sense of the segment agrees with, or opposes, that of the parent curve. If SameSense is false, the point with highest parameter value is taken as the first point of the segment.
NOTE  If the datatype of ParentCurve is IfcTrimmedCurve, the value of SameSense overrides the value of IfcTrimmedCurve.SenseAgreement
X
3ParentCurveIfcCurve The bounded curve which defines the geometry of the segment. X
UsingCurvesIfcCompositeCurve
@Segments
S[1:?]The set of composite curves which use this composite curve segment as a segment. This set shall not be empty. X
Dim
:=ParentCurve.Dim
IfcDimensionCountThe space dimensionality of this class, defined by the dimensionality of the first ParentCurve. X
Formal representations
XML Specification
 <xs:element name="IfcCompositeCurveSegment" type="ifc:IfcCompositeCurveSegment" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>
 <xs:complexType name="IfcCompositeCurveSegment">
  <xs:complexContent>
   <xs:extension base="ifc:IfcGeometricRepresentationItem">
    <xs:sequence>
     <xs:element name="ParentCurve" type="ifc:IfcCurve" nillable="true"/>
    </xs:sequence>
    <xs:attribute name="Transition" type="ifc:IfcTransitionCode" use="optional"/>
    <xs:attribute name="SameSense" type="ifc:IfcBoolean" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcCompositeCurveSegment
 SUPERTYPE OF(IfcReparametrisedCompositeCurveSegment)
 SUBTYPE OF (IfcGeometricRepresentationItem);
  Transition : IfcTransitionCode;
  SameSense : IfcBoolean;
  ParentCurve : IfcCurve;
 INVERSE
  UsingCurves : SET [1:?] OF IfcCompositeCurve FOR Segments;
 DERIVE
  Dim : IfcDimensionCount := ParentCurve.Dim;
 WHERE
  ParentIsBoundedCurve : ('IFCGEOMETRYRESOURCE.IfcBoundedCurve' IN TYPEOF(ParentCurve));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcCompositeCurve

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