Publisher Summary
The restrictions are powerful methods for defining classes of individuals. This chapter helps see that Web Ontology Language (OWL) augments this capability with a full set theory language, including intersections, unions, and complements. These can be used to combine restrictions together (e.g., the set of planets that go around the sun and have at least one moon) or to combine the classes one uses to define restrictions (a vegetarian is someone who eats food that is not meat). This combination provides a potent system for making very detailed descriptions of information. OWL also includes restrictions that refer to cardinalities—that is, referring to the number of distinct values for a particular property some individual has. ...
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