A set of concepts making up a known universe.
"This term originated in philosophy (the study of what exists and what we must assume exists in order to form a description of reality). It was adopted by the field of knowledge engineering, and is now being used widely (and sometimes vaguely) in information science. An ontology may be thought of as a set of concepts making up a known universe (e.g. entities, attributes, processes), their definitions and their inter-relationships. (Vickery, 1997; Soergel, 1999; Welty, 1999)."
From Currier, S and Wake, S "Negotiating Subject Access: Resources Discovery on the Web" in Library and Information Briefings, Issue 97, May 2001.
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