| Item | SPF | XML | Change | Description | IFC4x3_RC2 to IFC4x3_RC3 |
|---|---|---|---|---|
| IfcPolynomialCurve | MODIFIED | Name changed from IfcSeriesParameterCurve to IfcPolynomialCurve. | ||
| CoefficientsX | MODIFIED | Instantiation changed to OPTIONAL. | ||
| CoefficientsY | MODIFIED | Instantiation changed to OPTIONAL. | ||
| CoefficientsZ | ADDED |
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| 1 | Position | IfcPlacement | X | ||
| 2 | CoefficientsX | IfcReal | ? L[2:?] | X | |
| 3 | CoefficientsY | IfcReal | ? L[2:?] | X | |
| 4 | CoefficientsZ | IfcReal | ? L[2:?] | X |
| Rule | Description |
|---|---|
| ValidCoefficients | |
| CorrectPositionDim | Enforces same Dim of Position and curve Dim. |
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| 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 | |
| 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 | ||
| IfcPolynomialCurve | |||||
| 1 | Position | IfcPlacement | X | ||
| 2 | CoefficientsX | IfcReal | ? L[2:?] | X | |
| 3 | CoefficientsY | IfcReal | ? L[2:?] | X | |
| 4 | CoefficientsZ | IfcReal | ? L[2:?] | X | |
<xs:element name="IfcPolynomialCurve" type="ifc:IfcPolynomialCurve" substitutionGroup="ifc:IfcCurve" nillable="true"/>
<xs:complexType name="IfcPolynomialCurve">
<xs:complexContent>
<xs:extension base="ifc:IfcCurve">
<xs:sequence>
<xs:element name="Position" type="ifc:IfcPlacement" nillable="true"/>
</xs:sequence>
<xs:attribute name="CoefficientsX" use="optional">
<xs:simpleType>
<xs:restriction>
<xs:simpleType>
<xs:list itemType="ifc:IfcReal"/>
</xs:simpleType>
<xs:minLength value="2"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="CoefficientsY" use="optional">
<xs:simpleType>
<xs:restriction>
<xs:simpleType>
<xs:list itemType="ifc:IfcReal"/>
</xs:simpleType>
<xs:minLength value="2"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="CoefficientsZ" use="optional">
<xs:simpleType>
<xs:restriction>
<xs:simpleType>
<xs:list itemType="ifc:IfcReal"/>
</xs:simpleType>
<xs:minLength value="2"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcPolynomialCurve
SUBTYPE OF (IfcCurve);
Position : IfcPlacement;
CoefficientsX : OPTIONAL LIST [2:?] OF IfcReal;
CoefficientsY : OPTIONAL LIST [2:?] OF IfcReal;
CoefficientsZ : OPTIONAL LIST [2:?] OF IfcReal;
WHERE
ValidCoefficients : (EXISTS(CoefficientsX) AND EXISTS(CoefficientsY)) OR (EXISTS(CoefficientsX) AND EXISTS(CoefficientsZ)) OR (EXISTS(CoefficientsY) AND EXISTS(CoefficientsZ)) OR (EXISTS(CoefficientsX) AND EXISTS(CoefficientsY) AND EXISTS(CoefficientsZ));
CorrectPositionDim : ((Position.Dim=2) AND (NOT EXISTS(CoefficientsZ))) OR (Position.Dim=3);
END_ENTITY;
EXPRESS-G diagram
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