#### IfcDerivedUnitElement

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from ISO/CD 10303-41:1992: A derived unit element is one of the unit quantities which makes up a derived unit.

> EXAMPLE: Newtons per square millimetre is a derived unit. It has two elements, Newton whose exponent has a value of 1 and millimetre whose exponent is -2.

> NOTE Corresponding STEP name: derived_unit_element, please refer to ISO/IS 10303-41:1994 for the final definition of the formal standard.

> HISTORY New entity in IFC Release 1.5.1.

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
1 | Unit | IfcNamedUnit | [1:1] | The fixed quantity which is used as the mathematical factor. | X
2 | Exponent | INTEGER | [1:1] | The power that is applied to the unit attribute. | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
IfcDerivedUnitElement
1 | Unit | IfcNamedUnit | [1:1] | The fixed quantity which is used as the mathematical factor. | X
2 | Exponent | INTEGER | [1:1] | The power that is applied to the unit attribute. | X

##### Formal representations

XSD Specification
`<xs:element name="IfcDerivedUnitElement" type="ifc:IfcDerivedUnitElement" substitutionGroup="ifc:Entity" nillable="true"/>
<xs:complexType name="IfcDerivedUnitElement">
<xs:complexContent>
<xs:extension base="ifc:Entity">
<xs:sequence>
<xs:element name="Unit" type="ifc:IfcNamedUnit" nillable="true"/>
</xs:sequence>
<xs:attribute name="Exponent" type="xs:long" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcDerivedUnitElement;
Unit : IfcNamedUnit;
Exponent : INTEGER;
END_ENTITY;

EXPRESS-G diagram

`

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