IfcOuterBoundaryCurve

Natural language names
Äußere Begrenzungskurve
Outer Boundary Curve
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4 4.0.0.0
    IfcOuterBoundaryCurveADDED
IFC4 Addendum 1 4.0.1.0
    IfcOuterBoundaryCurve
      SelfIntersectMODIFIEDType changed from LOGICAL to IfcLogical.
IFC4x2 Candidate 4.2.0.0
    IfcOuterBoundaryCurve
      PositioningElementADDED
IFC4x2 to IFC4x3_RC1
    IfcOuterBoundaryCurve
      PositioningElementMODIFIEDAggregation changed from NONE to SET.
IFC4x3_RC1 to IFC4x3_RC2
    IfcOuterBoundaryCurve
      SegmentsXXMODIFIEDType changed from IfcCompositeCurveSegment to IfcSegment.
IFC4x3_RC2 to IFC4x3_RC3
    IfcOuterBoundaryCurve
      PositioningElementDELETED
Semantic definitions at the entity
Entity definition

The IfcOuterBoundaryCurve defines the outer boundary of a bounded surface.

NOTE  Definition according to ISO/CD 10303-42:1992
This is a special subtype of boundary curve which has the additional semantics of defining an outer boundary of a surface. No more than one such curve shall be included in the set of boundaries of a curve bounded surface.

NOTE  Entity adapted from outer_boundary_curve in ISO 10303-42.

HISTORY  New entity in IFC4.

Inherited definitions from supertypes
Entity inheritance IfcBoundaryCurve IfcCompositeCurveOnSurface IfcCompositeCurve 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
IfcCompositeCurve
1SegmentsIfcSegmentL[1:?] The component bounded curves, their transitions and senses. The transition attribute for the last segment defines the transition between the end of the last segment and the start of the first; this transition attribute may take the value discontinuous, which indicates an open curve.
NOTE&nbsp: For IfcGradientCurve and IfcSegmentedReferenceCurve the segments define the interpolation between segment start and and segment end.
X
2SelfIntersectIfcLogical Indication of whether the curve intersects itself or not; this is for information only. X
NSegments
:=SIZEOF(Segments)
IfcIntegerThe number of component curves. X
ClosedCurve
:=Segments[NSegments].Transition <> Discontinuous
IfcLogicalIndication whether the curve is closed or not; this is derived from the transition code of the last segment. X
IfcCompositeCurveOnSurface
BasisSurface
:=IfcGetBasisSurface(SELF)
IfcSurfaceS[0:1]The surface on which the composite curve is defined. X
IfcBoundaryCurve
IfcOuterBoundaryCurve
Formal representations
XML Specification
 <xs:element name="IfcOuterBoundaryCurve" type="ifc:IfcOuterBoundaryCurve" substitutionGroup="ifc:IfcBoundaryCurve" nillable="true"/>
 <xs:complexType name="IfcOuterBoundaryCurve">
  <xs:complexContent>
   <xs:extension base="ifc:IfcBoundaryCurve"/>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcOuterBoundaryCurve
 SUBTYPE OF (IfcBoundaryCurve);
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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