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* About ontology.

Ontology is a formal representation of knowledge as a set of concepts within a
domain, and the relationships between those concepts. It is used to reason
about the entities within that domain, and may be used to describe the domain.

  http://en.wikipedia.org/wiki/Ontology_%28computer_science%29

  http://en.wikipedia.org/wiki/WordNet
                lexical database for the English language