IfcCurveBoundedPlane

Semantic definitions at the entity

Entity definition

The IfcCurveBoundedPlane is a parametric planar surface with curved boundaries defined by one or more boundary curves. The bounded plane is defined to be the portion of the basis surface in the direction of N x T from any point on the boundary, where N is the surface normal and T the boundary curve tangent vector at this point. The region so defined shall be arcwise connected.

The BasisSurface is an IfcPlane that establishes the position coordinate system by SELF\IfcElementarySurface.Position. The OuterBoundary and the InnerBoundaries (if provided) shall lie on the surface of IfcPlane. The outer and inner boundary curves shall be defined using the u, and v values provided by parameterization of the BasisSurface as their x, and y coordinate values.

NOTE Entity defined in analogy to curve_bounded_surface defined in ISO 10303-42.

HISTORY New entity in IFC1.5

IFC2x CHANGE The data type of the attribute OuterBoundary and InnerBoundaries has been changed from Ifc2DCompositeCurve to supertype IfcCurve.

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
1	BasisSurface	IfcPlane	[1:1]	The surface to be bound.	X
2	OuterBoundary	IfcCurve	[1:1]	The outer boundary of the surface.	X
3	InnerBoundaries	IfcCurve	S[0:?]	An optional set of inner boundaries. They shall not intersect each other or the outer boundary.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
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.	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.	X
IfcGeometricRepresentationItem
IfcSurface
	Dim :=3	IfcDimensionCount	[1:1]	The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item.	X
IfcBoundedSurface
IfcCurveBoundedPlane
1	BasisSurface	IfcPlane	[1:1]	The surface to be bound.	X
2	OuterBoundary	IfcCurve	[1:1]	The outer boundary of the surface.	X
3	InnerBoundaries	IfcCurve	S[0:?]	An optional set of inner boundaries. They shall not intersect each other or the outer boundary.	X

Formal representations

XSD Specification

 <xs:element name="IfcCurveBoundedPlane" type="ifc:IfcCurveBoundedPlane" substitutionGroup="ifc:IfcBoundedSurface" nillable="true"/>

 <xs:complexType name="IfcCurveBoundedPlane">

  <xs:complexContent>

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

    <xs:sequence>

     <xs:element name="BasisSurface" type="ifc:IfcPlane" nillable="true"/>

     <xs:element name="OuterBoundary" type="ifc:IfcCurve" nillable="true"/>

     <xs:element name="InnerBoundaries">

      <xs:complexType>

       <xs:sequence>

        <xs:element ref="ifc:IfcCurve" minOccurs="0" maxOccurs="unbounded"/>

       </xs:sequence>

       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcCurve"/>

       <xs:attribute ref="ifc:cType" fixed="set"/>

       <xs:attribute ref="ifc:arraySize" use="optional"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcCurveBoundedPlane

 SUBTYPE OF (IfcBoundedSurface);

  BasisSurface : IfcPlane;

  OuterBoundary : IfcCurve;

  InnerBoundaries : SET OF IfcCurve;

END_ENTITY;

 EXPRESS-G diagram

	Durch Kurven begrenzte Ebene
	Curve Bounded Plane