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Thema general information:
Thema Subject Codes
Introduction
Users want to see Thema presented as ONIX, especially to understand What do you do with a translator entry with a second subject or a qualifier? BISAC and Thema are very similar – both are designed to support trade retail sales and do that by naming a single subject as a "Main Subject" to be used by retailers. One way to think of that Main Subject is that it directs the book to the right retail buyer as most buyers work within subject areas. Librarians tend to work in a similar way with an interested professional specializing in areas. A Main Subject is like saying which book professional would care most about this book.
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