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+-*- mode: outline; coding: utf-8 -*-
+
+* 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
+