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Ontology is part of metaphysics.
The word ontology refers to two things:
- A study of the subject of the categories of
things that exist or may exist in some domain. Thus
ontology is the study of categories.
(Cf. biology, which is the study of living things, and
theology which is the study of knowledge pertaining to
- The product of such a study is called
The product of an ontological study will as a minimum come up with
a type hierarchy. It may also come up with a relation
hierarchy, as is the case in conceptual graph-theory. These two
combined will be called an ontology.
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