Reference framework:Units

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Units is a Reference framework containing an ontology based on the Quantities, Units, Dimensions and Data Types Ontologies, as developed by NASA and TopQuadrant (see qudt.org).

The Units reference framework contains the qudt:Unit class, referred to by the Unit-property of the NumericProperty class.

It has subclasses for units based on the SI-system, units derived there from, as well as additional units like financial, science- and engineering, physical and dimension-less units.
The framework also supplies instances (listings) for these classes.

To facilitate an “easy” picklist, the CoinsUnitSelection class is added. From the available units, it contains a selection of mostly used units. This selection can be customized for own purposes.


Informative representation in UML

Informative representation of Units in UML

Informative representation of Units in UML


units derived there from => units derived therefrom










Unit Class

Informative representation of the Unit inheritance graph (Topbraid Composer)

Informative representation of the Unit inheritance graph (Topbraid Composer)






















Formal Representation in RDF/XML

 <owl:Class rdf:about="qudt:Unit">

   <rdfs:label xml:lang="en-GB">Unit</rdfs:label>
   <rdfs:comment xml:lang="en-GB">Unit</rdfs:comment>

   <rdfs:subClassOf rdf:resource="owl:Thing"/>

 </owl:Class>


CoinsUnitSelection Class

Informative listing of the selected Units (Topbraid Composer)

Informative listing of the selected units (Topbraid Composer)



















Formal Representation in RDF/XML

 <owl:Class rdf:about="cbim-2.0.rdf#CoinsUnitSelection">
   <rdfs:subClassOf rdf:resource="http://qudt.org/schema/qudt#Unit"/>
 </owl:Class>


See also


External links