Rules for Thesaurus Terms
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The terms can be one or more words
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They can have a qualifier which clarifies the meaning of the term
For example, crane (bird) and crane (machine)
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They are either preferred or not preferred
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Preferred terms can't be the right side of a USE relationship.
For example, if Truck is the preferred term, the following thesaurus relationship is invalid: Lorry USE Truck
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Non-preferred terms can't have a BT, NT, or RT relationship and can't be the left side of a UF relationship
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Thesaurus BT relationships can't be linked to a term that already has an NT relationship
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Thesaurus NT relationships can't be linked to a term that already has a BT relationship
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Thesaurus BT, BTI, BTP, BTG, NT, NTI, NTP, and NTG relationships defined in the thesaurus should be independent of context (always true).