Summary
QUDT is an elaborate ontology, but not a very large one. It includes a few dozen classes and several hundred units, quantities, and vectors. But it expresses subtle distinctions that are important for providing services with units. It accomplishes the three major goals we laid out at the beginning of this section; it provides a global reference (URI) for comprehensive systems of units, it provides a means for converting from any unit to any commensurate unit, and it provides enough information to perform dimensional analysis on any of over 200 units that it defines. It accomplishes this with a careful separation of entities—quantities, units and dimensions, as well as a comprehensive catalog of information about the conventional units ...
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