An explicitly specified conceptualisation of part of the world.
"An ontology, in computer science, has come to denote an explicitly specified conceptualisation of part of the world. In software, and ontology is implemented as a data structure. What distinguishes the ontology from the data structure is semantics: that it talks about something in the world. An ontology provides users with a representation which is essential to effective communication and coordination."
From Lee, M, Baillie, S and Dell'Oro, J "TML: Thesaurus Markup Language" in Proceedings of the 4th Australasian Document Computing Symposium, Coffs Harbour, Australia, December 3, 1999.
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