#### IfcDimensionalExponents

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from ISO/CD 10303-41:1992: The dimensionality of any quantity can be expressed as a product of powers of the dimensions of base quantities. The dimensional exponents entity defines the powers of the dimensions of the base quantities. All the physical quantities are founded on seven base quantities (ISO 31 (clause 2)).

> NOTE: Length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity are the seven base quantities.

> EXAMPLE: A length of 2 millimetres has a length exponent of 1. The remaining exponents are equal to 0.

> EXAMPLE: A velocity of 2 millimetres per second has a length exponent of 1 and a time exponent of -1. The remaining exponents are equal to 0.

> NOTE Corresponding STEP name: dimensional_exponents, 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 | LengthExponent | INTEGER | [1:1] | The power of the length base quantity. | X
2 | MassExponent | INTEGER | [1:1] | The power of the mass base quantity. | X
3 | TimeExponent | INTEGER | [1:1] | The power of the time base quantity. | X
4 | ElectricCurrentExponent | INTEGER | [1:1] | The power of the electric current base quantity. | X
5 | ThermodynamicTemperatureExponent | INTEGER | [1:1] | The power of the thermodynamic temperature base quantity. | X
6 | AmountOfSubstanceExponent | INTEGER | [1:1] | The power of the amount of substance base quantity. | X
7 | LuminousIntensityExponent | INTEGER | [1:1] | The power of the luminous intensity base quantity. | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
IfcDimensionalExponents
1 | LengthExponent | INTEGER | [1:1] | The power of the length base quantity. | X
2 | MassExponent | INTEGER | [1:1] | The power of the mass base quantity. | X
3 | TimeExponent | INTEGER | [1:1] | The power of the time base quantity. | X
4 | ElectricCurrentExponent | INTEGER | [1:1] | The power of the electric current base quantity. | X
5 | ThermodynamicTemperatureExponent | INTEGER | [1:1] | The power of the thermodynamic temperature base quantity. | X
6 | AmountOfSubstanceExponent | INTEGER | [1:1] | The power of the amount of substance base quantity. | X
7 | LuminousIntensityExponent | INTEGER | [1:1] | The power of the luminous intensity base quantity. | X

##### Formal representations

XSD Specification
`<xs:element name="IfcDimensionalExponents" type="ifc:IfcDimensionalExponents" substitutionGroup="ifc:Entity" nillable="true"/>
<xs:complexType name="IfcDimensionalExponents">
<xs:complexContent>
<xs:extension base="ifc:Entity">
<xs:attribute name="LengthExponent" type="xs:long" use="optional"/>
<xs:attribute name="MassExponent" type="xs:long" use="optional"/>
<xs:attribute name="TimeExponent" type="xs:long" use="optional"/>
<xs:attribute name="ElectricCurrentExponent" type="xs:long" use="optional"/>
<xs:attribute name="ThermodynamicTemperatureExponent" type="xs:long" use="optional"/>
<xs:attribute name="AmountOfSubstanceExponent" type="xs:long" use="optional"/>
<xs:attribute name="LuminousIntensityExponent" type="xs:long" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcDimensionalExponents;
LengthExponent : INTEGER;
MassExponent : INTEGER;
TimeExponent : INTEGER;
ElectricCurrentExponent : INTEGER;
ThermodynamicTemperatureExponent : INTEGER;
AmountOfSubstanceExponent : INTEGER;
LuminousIntensityExponent : INTEGER;
END_ENTITY;

EXPRESS-G diagram

`

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