#### IfcPolyline

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from ISO/CD 10303-42:1992: An IfcPolyline is a bounded curve of n -1 linear segments, defined by a list of n points, P1, P2 ... Pn. The curve is parameterized as follows:

for 1 £ i £ n - 1, where i -1 £ u £ i and with parametric range of 0 £ u £ n - 1.

> NOTE Corresponding STEP entity: polyline. Please refer to ISO/IS 10303-42:1994, p. 45 for the final definition of the formal standard.

> HISTORY New class in IFC Release 1.0

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
1 | Points | IfcCartesianPoint | L[2:?] | The points defining the polyline. | X

Formal Propositions

Rule | Description
--- | ---
WR41 | The space dimensionality of all Points shall be the same.

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
IfcRepresentationItem
IfcGeometricRepresentationItem
IfcCurve
| Dim :=IfcCurveDim(SELF) | IfcDimensionCount | [1:1] | The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve. | X
IfcBoundedCurve
IfcPolyline
1 | Points | IfcCartesianPoint | L[2:?] | The points defining the polyline. | X

##### Formal representations

XSD Specification
`<xs:element name="IfcPolyline" type="ifc:IfcPolyline" substitutionGroup="ifc:IfcBoundedCurve" nillable="true"/>
<xs:complexType name="IfcPolyline">
<xs:complexContent>
<xs:extension base="ifc:IfcBoundedCurve">
<xs:sequence>
<xs:element name="Points">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcCartesianPoint" minOccurs="2" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcCartesianPoint"/>
<xs:attribute ref="ifc:cType" fixed="list"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcPolyline
SUBTYPE OF (IfcBoundedCurve);
Points : LIST [2:?] OF IfcCartesianPoint;
WHERE
WR41 : SIZEOF(QUERY(Temp <* Points | Temp.Dim <> Points[1].Dim)) = 0;
END_ENTITY;

EXPRESS-G diagram

`

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