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Semantic Web for the Working Ontologist, 2nd Edition by James Hendler, Dean Allemang

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Quantities, Units, and Dimensions

As part of the Constellation Program, NASA developed an ontology to deal with units of measure. The utility of controlling references to units in science and engineering has been understood for centuries, and there are several standard systems of units; there is the US Customary set of units (with things like miles, feet, and degrees Fahrenheit), the international system (“SI”) that includes meters, kilograms, and Kelvins. NASA built an ontology of Quantities, Units, and Dimensions (QUDT)2 to capture and manage this information.

What is the purpose of such an ontology? In contrast to OGP and Good Relations, which provide vocabularies that assist web page developers in marking up their pages, QUDT cuts across ...

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