A controlled vocabulary, structured into a hierarchy.
"A controlled vocabulary, structured into a hierarchy and presenting semantic relationships using Broader Term, Narrower Term, Related Term, and usually enriched with Use and Use For references and Scope Notes. Consists of semantically independent units, usually individual terms, or phrases in which the terms cannot be separated."
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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