IfcBoundedCurve

BACnet MVD

#### IfcBoundedCurve

Natural language names

| Begrenzte Kurve
| Bounded Curve
| Courbe englobée

##### Semantic definitions at the entity

Entity definition

An IfcBoundedCurve is a curve of finite length.

> NOTE Definition according to ISO/CD 10303-42:1992
> A bounded curve is a curve of finite arc length with identifiable end points.

> NOTE Entity adapted from bounded_curve defined in ISO10303-42.

> HISTORY New entity in IFC1.0

Informal Propositions:

1. A bounded curve has finite arc length.
2. A bounded curve has a start point and an end point.

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
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.

> 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

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.

> IFC2x3 CHANGE The inverse attribute StyledByItem has been added.

X

X

IfcGeometricRepresentationItem
IfcCurve
| Dim :=IfcCurveDim(SELF) | IfcDimensionCount |  | The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve. | X | X
IfcBoundedCurve

##### Formal representations

XML Specification
`<xs:element name="IfcBoundedCurve" type="ifc:IfcBoundedCurve" abstract="true" substitutionGroup="ifc:IfcCurve" nillable="true"/>
<xs:complexType name="IfcBoundedCurve" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:IfcCurve"/>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcBoundedCurve
ABSTRACT SUPERTYPE OF(ONEOF(IfcBSplineCurve, IfcCompositeCurve, IfcIndexedPolyCurve, IfcPolyline, IfcTrimmedCurve))
SUBTYPE OF (IfcCurve);
END_ENTITY;

EXPRESS-G diagram

`

References: IfcCurveOrEdgeCurve IfcPolygonalBoundedHalfSpace IfcArbitraryOpenProfileDef

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