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I want to model a Thesaurus using the ANSI/NISO standard relation description like "broader term", "narrow term", etc. (see this Wikipedia article for details). Is it valid for a Thesaurus item in this description standard to have more than one "use" relationship?

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USE is for mapping entry vocabulary to authorized terms. It's an equivalency relationship. Therefore 1:1. Use for is just the opposite; it defines a specific term to be used instead of (often) multiple common terms. e.g. you might have ('vermilion: USE 'red), or you could have ('red: USE-FOR 'pink, 'vermilion, 'rose).

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