#### IfcLShapeProfileDef

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from IAI: The IfcLShapeProfileDef defines a section profile that provides the defining parameters of an L-shaped section (equilateral L profiles are also covered by this entity) 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 shorter leg has the same direction as the positive x-axis, the longer or equal leg the same as the positive y-axis. The centre of the position coordinate system is in the profiles centre of the gravity bounding box.

The centre of gravity, if given, is located in x direction along the negative x axis, the offset value is given by the offset parameter CentreOfGravityInX, and in y-direction along the negative y axis, the offset value is given by the offset parameter CentreOfGravityInY.

> HISTORY New entity in Release IFC2x Edition 2.

> IFC2x Edition 3 CHANGE All profile origins are now in the center of the bounding box. The attribute CentreOfGravityInY has been made OPTIONAL. Upward compatibility for file based exchange is guaranteed.

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.
Note: The black coordinate axes show the underlying coordinate system of the swept surface or swept area solid | Position The profile is inserted into the underlying coordinate system of the swept area solid by using the Position attribute. In this example (cardinal point of gravity) the attribute values of IfcAxis2Placement2D are: `Location = IfcCartesianPoint(<CentreOfGravityInX>,<``CentreOfGravityInY``>) RefDirection = NIL (defaults to 1.,0.)` Note: if the values of CentreOfGravityInX and CentreOfGravityInY are given, they are already negative values, since the shift of the centre of gravity is into the negative X and negative Y axis. Parameter If the Width parameter is not given, it defaults to the value of Depth, therefore an equal sided L-shape profile is created, if the LegSlope parameter is not given, both legs have parallel edges.

Table: Parameters of equal-sided and non-equal sided L-shaped section definition

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
4 | Depth | IfcPositiveLengthMeasure | [1:1] | Leg length, see illustration above (= h). | X
5 | Width | - |  | This attribute is out of scope for this model view definition and shall not be set. |
6 | Thickness | IfcPositiveLengthMeasure | [1:1] | Constant wall thickness of profile, see illustration above (= ts). | X
7 | FilletRadius | - |  | This attribute is out of scope for this model view definition and shall not be set. |
8 | EdgeRadius | - |  | This attribute is out of scope for this model view definition and shall not be set. |
9 | LegSlope | - |  | This attribute is out of scope for this model view definition and shall not be set. |
10 | CentreOfGravityInX | - |  | This attribute is out of scope for this model view definition and shall not be set. |
11 | CentreOfGravityInY | - |  | This attribute is out of scope for this model view definition and shall not be set. |

Formal Propositions

Rule | Description
--- | ---
WR21 | The thickness of the flange has to be smaller than the depth of the profile.
WR22 | The thickness of the flange has to be smaller than the width of the profile (if given).

##### 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
IfcLShapeProfileDef
4 | Depth | IfcPositiveLengthMeasure | [1:1] | Leg length, see illustration above (= h). | X
5 | Width | - |  | This attribute is out of scope for this model view definition and shall not be set. |
6 | Thickness | IfcPositiveLengthMeasure | [1:1] | Constant wall thickness of profile, see illustration above (= ts). | X
7 | FilletRadius | - |  | This attribute is out of scope for this model view definition and shall not be set. |
8 | EdgeRadius | - |  | This attribute is out of scope for this model view definition and shall not be set. |
9 | LegSlope | - |  | This attribute is out of scope for this model view definition and shall not be set. |
10 | CentreOfGravityInX | - |  | This attribute is out of scope for this model view definition and shall not be set. |
11 | CentreOfGravityInY | - |  | This attribute is out of scope for this model view definition and shall not be set. |

##### Formal representations

XSD Specification
`<xs:element name="IfcLShapeProfileDef" type="ifc:IfcLShapeProfileDef" substitutionGroup="ifc:IfcParameterizedProfileDef" nillable="true"/>
<xs:complexType name="IfcLShapeProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcParameterizedProfileDef">
<xs:attribute name="Depth" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
<xs:attribute name="Thickness" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcLShapeProfileDef
SUBTYPE OF (IfcParameterizedProfileDef);
Depth : IfcPositiveLengthMeasure;
Width : OPTIONAL IfcStrippedOptional;
Thickness : IfcPositiveLengthMeasure;
FilletRadius : OPTIONAL IfcStrippedOptional;
EdgeRadius : OPTIONAL IfcStrippedOptional;
LegSlope : OPTIONAL IfcStrippedOptional;
CentreOfGravityInX : OPTIONAL IfcStrippedOptional;
CentreOfGravityInY : OPTIONAL IfcStrippedOptional;
WHERE
WR21 : Thickness < Depth;
WR22 : NOT(EXISTS(Width)) OR (Thickness < Width);
END_ENTITY;

EXPRESS-G diagram

`

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