IfcReparametrisedCompositeCurveSegment

BACnet MVD

#### IfcReparametrisedCompositeCurveSegment

Natural language names

| Reparametrisiertes Segment einer zusammengesetzten Kurve
| Reparametrised Composite Curve Segment

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcReparametrisedCompositeCurveSegment |  |  | ADDED |
IFC4 Addendum 1
IfcReparametrisedCompositeCurveSegment |  |  |  |
SameSense |  |  | MODIFIED | Type changed from BOOLEAN to IfcBoolean.

##### Semantic definitions at the entity

Entity definition

The IfcReparametrisedCompositeCurveSegment is geometrically identical to a IfcCompositeCurveSegment but with the additional capability of reparametrization.

> NOTE Definition according to ISO/CD 10303-42:1992
> The reparametrised composite curve segment is a special type of composite curve segment which provides the capability to re-define its parametric length without changing its geometry.
> Let l = ParamLength. If t0 ≤ t ≤ t1 is the parameter range of ParentCurve, the new parameter . for the reparametrised composite curve segment is given by the equation:

> > if SameSense = TRUE;

> or by the equation:

> > if SameSense = FALSE;

> NOTE Entity adapted from reparametrised_composite_curve_segment in ISO 10303-42.

> HISTORY New entity in IFC4

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
4 | ParamLength | IfcParameterValue |  |  |  | X

Formal Propositions

Rule | Description
--- | ---
PositiveLengthParameter | The ParamLength shall be greater than zero.

##### 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
IfcCompositeCurveSegment
1 | Transition | IfcTransitionCode |  | 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

2

SameSense

IfcBoolean

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

3 | ParentCurve | IfcCurve |  | The bounded curve which defines the geometry of the segment. |  | X
| UsingCurves | IfcCompositeCurve @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 | IfcDimensionCount |  | The space dimensionality of this class, defined by the dimensionality of the first ParentCurve. |  | X
IfcReparametrisedCompositeCurveSegment
4 | ParamLength | IfcParameterValue |  |  |  | X

##### Formal representations

XML Specification
`<xs:element name="IfcReparametrisedCompositeCurveSegment" type="ifc:IfcReparametrisedCompositeCurveSegment" substitutionGroup="ifc:IfcCompositeCurveSegment" nillable="true"/>
<xs:complexType name="IfcReparametrisedCompositeCurveSegment">
<xs:complexContent>
<xs:extension base="ifc:IfcCompositeCurveSegment">
<xs:attribute name="ParamLength" type="ifc:IfcParameterValue" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcReparametrisedCompositeCurveSegment
SUBTYPE OF (IfcCompositeCurveSegment);
ParamLength : IfcParameterValue;
WHERE
PositiveLengthParameter : ParamLength > 0.0;
END_ENTITY;

EXPRESS-G diagram

`

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