#### IfcCenterLineProfileDef

Natural language names

##### Semantic definitions at the entity

Entity definition

The profile IfcCenterLineProfileDef defines an arbitrary two-dimensional open, not self intersecting profile for the use within the swept solid geometry. It is given by an area defined by applying a constant thickness to a centerline, generating an area from which the solid can be constructed.

> HISTORY New entity in IFC2x Edition 3.

Informal proposition:

1. The Curve has to be an open curve.
2. The Curve has to be a non-intersecting curve.

Illustration:

| Position The Curve is defined in the underlying coordinate system. The underlying coordinate system is defined by the swept surface that uses the profile definition. It is the xy plane of: IfcSweptSurface.Position Parameter The Curve attribute defines a two dimensional open bounded curve. The Thickness attribute defines a constant thickness along the curve.

Table: Definition of center line profile definition

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
4 | Thickness | IfcPositiveLengthMeasure | [1:1] | Constant thickness applied along the center line. | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
IfcProfileDef
1 | ProfileType | IfcProfileTypeEnum | [1:1] | Defines the type of geometry into which this profile definition shall be resolved, either a curve or a surface area. In case of curve the profile should be referenced by a swept surface, in case of area the profile should be referenced by a swept area solid. | X
2 | ProfileName | - |  | This attribute is out of scope for this model view definition and shall not be set. |
IfcArbitraryOpenProfileDef
3 | Curve | IfcBoundedCurve | [1:1] | Open bounded curve defining the profile. | X
IfcCenterLineProfileDef
4 | Thickness | IfcPositiveLengthMeasure | [1:1] | Constant thickness applied along the center line. | X

##### Formal representations

XSD Specification
`<xs:element name="IfcCenterLineProfileDef" type="ifc:IfcCenterLineProfileDef" substitutionGroup="ifc:IfcArbitraryOpenProfileDef" nillable="true"/>
<xs:complexType name="IfcCenterLineProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcArbitraryOpenProfileDef">
<xs:attribute name="Thickness" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcCenterLineProfileDef
SUBTYPE OF (IfcArbitraryOpenProfileDef);
Thickness : IfcPositiveLengthMeasure;
END_ENTITY;

EXPRESS-G diagram

`

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