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A Class is a collection of Entities. One Entity may belong to any number of Classes: for example, an Entity called John Smith may have or belong to the Classes of Composer, Publisher, AmericanCitizen, AuthorisedSystemUser, MigraineSufferer and CarDriver. Classes themselves
may belong to other Classes. For example, Composer, Author and Illustrator may all
belong to the Class of ContributorType in an Ontology. A group of Classes in an Ontology may therefore
make up a 'controlled value set' of instances of another Class.
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