#### IfcArbitraryOpenProfileDef

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from IAI: The open profile IfcArbitraryOpenProfileDef defines an arbitrary two-dimensional open profile for the use within the swept surface geometry. It is given by an open boundary from with the surface can be constructed.

> HISTORY: New entity in IFC Release 2x.

Informal proposition:

1. The Curve has to be an open 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.

Table: Definition of arbitrary open profile definition

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
3 | Curve | IfcBoundedCurve | [1:1] | Open bounded curve defining the profile. | X

Formal Propositions

Rule | Description
--- | ---
WR11 | The profile type is a .CURVE., an open profile can only be used to define a swept surface. Note6nbsp; This does not apply to the subtype IfcCentreLineProfileDef.
WR12 | The dimensionality of the curve shall be 2.

##### 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

##### Formal representations

XSD Specification
`<xs:element name="IfcArbitraryOpenProfileDef" type="ifc:IfcArbitraryOpenProfileDef" substitutionGroup="ifc:IfcProfileDef" nillable="true"/>
<xs:complexType name="IfcArbitraryOpenProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcProfileDef">
<xs:sequence>
<xs:element name="Curve" type="ifc:IfcBoundedCurve" nillable="true"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcArbitraryOpenProfileDef
SUPERTYPE OF(IfcCenterLineProfileDef)
SUBTYPE OF (IfcProfileDef);
Curve : IfcBoundedCurve;
WHERE
WR11 : ('IFCPROFILERESOURCE.IFCCENTERLINEPROFILEDEF' IN TYPEOF(SELF)) OR (SELF\IfcProfileDef.ProfileType = IfcProfileTypeEnum.CURVE);
WR12 : Curve.Dim = 2;
END_ENTITY;

EXPRESS-G diagram

`

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