From Federation of Earth Science Information Partners
1 identifier 1
2 name 0..*
2 derivationUnitTerm 1..*

Derived units are defined by combination of other units. Derived units are used for quantities other than those corresponding to the base units, such as hertz (s-1) for frequency, Newton (kg.m/s2) for force. Derived units based directly on base units are usually preferred for quantities other than the fundamental quantities within a system. If a derived unit is not the preferred unit, the gml:ConventionalUnit element should be used instead.

ISO Legend

Possible Parent Elements

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Example documenting mass density measured in kg/m^3

<gml:DerivedUnit gml:id="massDensity">
     <gml:identifier codeSpace="mass density"/>
     <gml:derivationUnitTerm uom="kg" exponent="1"/>
     <gml:derivationUnitTerm uom="m" exponent="-3"/>