#### IfcCircleHollowProfileDef

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from IAI: The IfcCircleHollowProfileDef defines a section profile that provides the defining parameters of a circular hollow section (tube) to be used by the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration.The centre of the position coordinate system is in the profile's centre of the bounding box (for symmetric profiles identical with the centre of gravity).

> HISTORY: New entity in Release IFC2x Edition 2.

Illustration:

| Position The parameterized profile defines its own position coordinate system. The underlying coordinate system is defined by the swept area solid that uses the profile definition. It is the xy plane of: IfcSweptAreaSolid.Position by using offsets of the position location, the parameterized profile can be positioned centric (using x,y offsets = 0.), or at any position relative to the profile. Explicit coordinate offsets are used to define cardinal points (e.g. upper-left bound). Parameter The parameterized profile is defined by a set of parameter attributes, see attribute definition below.

Table: Parameters of circular hollow profile definition

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
5 | WallThickness | IfcPositiveLengthMeasure | [1:1] | Thickness of the material, it is the difference between the outer and inner radius. | X

Formal Propositions

Rule | Description
--- | ---
WR1 | The wall thickness shall be smaller then the radius.

##### 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. |
IfcParameterizedProfileDef
3 | Position | IfcAxis2Placement2D | [1:1] | Position coordinate system of the parameterized profile definition. | X
IfcCircleProfileDef
4 | Radius | IfcPositiveLengthMeasure | [1:1] | The radius of the circle. | X
IfcCircleHollowProfileDef
5 | WallThickness | IfcPositiveLengthMeasure | [1:1] | Thickness of the material, it is the difference between the outer and inner radius. | X

##### Formal representations

XSD Specification
`<xs:element name="IfcCircleHollowProfileDef" type="ifc:IfcCircleHollowProfileDef" substitutionGroup="ifc:IfcCircleProfileDef" nillable="true"/>
<xs:complexType name="IfcCircleHollowProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcCircleProfileDef">
<xs:attribute name="WallThickness" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcCircleHollowProfileDef
SUBTYPE OF (IfcCircleProfileDef);
WallThickness : IfcPositiveLengthMeasure;
WHERE
WR1 : WallThickness < SELF\IfcCircleProfileDef.Radius;
END_ENTITY;

EXPRESS-G diagram

`

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