#### IfcRectangleHollowProfileDef

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from IAI: The IfcRectangleHollowProfileDef defines a section profile that provides the defining parameters of a rectangular (or square) hollow section to be used by the swept surface geometry or the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration. A square hollow section can be defined by equal values for h and b. The centre of the position coordinate system is in the profiles centre of the bounding box (for symmetric profiles identical with the centre of gravity). Normally, the longer sides are parallel to the y-axis, the shorter sides parallel to the x-axis.

> 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.

Figure: Parameters of rectangular or square hollow profile definition

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
6 | WallThickness | IfcPositiveLengthMeasure | [1:1] | Thickness of the material. | X
7 | InnerFilletRadius | - |  | This attribute is out of scope for this model view definition and shall not be set. |
8 | OuterFilletRadius | - |  | This attribute is out of scope for this model view definition and shall not be set. |

Formal Propositions

Rule | Description
--- | ---
WR31 | The wall thickness shall be smaller than the X and Y dimension of the rectangle.
WR32 | The outer fillet radius (if given) shall be smaller than or equal to the X and Y dimension of the rectangle.
WR33 | The inner fillet radius (if given) shall be smaller than or equal to the X and Y dimension of the rectangle minus the wall thickness.

##### 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
IfcRectangleProfileDef
4 | XDim | IfcPositiveLengthMeasure | [1:1] | The extent of the rectangle in the direction of the x-axis. | X
5 | YDim | IfcPositiveLengthMeasure | [1:1] | The extent of the rectangle in the direction of the y-axis. | X
IfcRectangleHollowProfileDef
6 | WallThickness | IfcPositiveLengthMeasure | [1:1] | Thickness of the material. | X
7 | InnerFilletRadius | - |  | This attribute is out of scope for this model view definition and shall not be set. |
8 | OuterFilletRadius | - |  | This attribute is out of scope for this model view definition and shall not be set. |

##### Formal representations

XSD Specification
`<xs:element name="IfcRectangleHollowProfileDef" type="ifc:IfcRectangleHollowProfileDef" substitutionGroup="ifc:IfcRectangleProfileDef" nillable="true"/>
<xs:complexType name="IfcRectangleHollowProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcRectangleProfileDef">
<xs:attribute name="WallThickness" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcRectangleHollowProfileDef
SUBTYPE OF (IfcRectangleProfileDef);
WallThickness : IfcPositiveLengthMeasure;
InnerFilletRadius : OPTIONAL IfcStrippedOptional;
OuterFilletRadius : OPTIONAL IfcStrippedOptional;
WHERE
WR31 : (WallThickness < (SELF\IfcRectangleProfileDef.XDim/2.)) AND (WallThickness < (SELF\IfcRectangleProfileDef.YDim/2.));
WR32 : NOT(EXISTS(OuterFilletRadius)) OR ((OuterFilletRadius <= (SELF\IfcRectangleProfileDef.XDim/2.)) AND (OuterFilletRadius <= (SELF\IfcRectangleProfileDef.YDim/2.)));
WR33 : NOT(EXISTS(InnerFilletRadius)) OR ((InnerFilletRadius <= (SELF\IfcRectangleProfileDef.XDim/2. - WallThickness)) AND (InnerFilletRadius <= (SELF\IfcRectangleProfileDef.YDim/2. - WallThickness)));
END_ENTITY;

EXPRESS-G diagram

`

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