#### IfcArbitraryClosedProfileDef

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from IAI: The closed profile IfcArbitraryClosedProfileDef defines an arbitrary two-dimensional profile for the use within the swept surface geometry, the swept area solid or a sectioned spine. It is given by an outer boundary from which the surface or solid can be constructed.

> HISTORY: New entity in IFC Release 1.5. Entity has been renamed from IfcArbitraryProfileDef in IFC Release 2x.

Informal proposition:

1. The OuterCurve has to be a closed curve.
2. The OuterCurve shall not intersect.

Illustration:

| Position The OuterCurve is defined in the underlying coordinate system. The underlying coordinate system is defined by the swept surface or swept area solid that uses the profile definition. It is the xy plane of either: IfcSweptSurface.Position IfcSweptAreaSolid.Position or in case of sectioned spines the xy plane of each list member of IfcSectionedSpine.CrossSectionPositions Parameter The OuterCurve attribute defines a two dimensional closed bounded curve.

Table: Definition of arbitrary closed profile definition

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
3 | OuterCurve | IfcCurve | [1:1] | Bounded curve, defining the outer boundaries of the arbitrary profile. | X

Formal Propositions

Rule | Description
--- | ---
WR1 | The curve used for the outer curve definition shall have the dimensionality of 2.
WR2 | The outer curve shall not be of type IfcLine as IfcLine is not a closed curve.
WR3 | The outer curve shall not be of type IfcOffsetCurve2D as it should not be defined as an offset of another curve.

##### 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. |
IfcArbitraryClosedProfileDef
3 | OuterCurve | IfcCurve | [1:1] | Bounded curve, defining the outer boundaries of the arbitrary profile. | X

##### Formal representations

XSD Specification
`<xs:element name="IfcArbitraryClosedProfileDef" type="ifc:IfcArbitraryClosedProfileDef" substitutionGroup="ifc:IfcProfileDef" nillable="true"/>
<xs:complexType name="IfcArbitraryClosedProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcProfileDef">
<xs:sequence>
<xs:element name="OuterCurve" type="ifc:IfcCurve" nillable="true"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcArbitraryClosedProfileDef
SUBTYPE OF (IfcProfileDef);
OuterCurve : IfcCurve;
WHERE
WR1 : OuterCurve.Dim = 2;
WR2 : NOT('IFCGEOMETRYRESOURCE.IFCLINE' IN TYPEOF(OuterCurve));
WR3 : NOT('IFCGEOMETRYRESOURCE.IFCOFFSETCURVE2D' IN TYPEOF(OuterCurve));
END_ENTITY;

EXPRESS-G diagram

`

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