ONIX codelists Issue 50

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List Code Heading Add Mod ?
27 Subject scheme identifier
Used with <SubjectSchemeIdentifier> <b067>
27 22 BISAC Merchandising Theme
BISAC Merchandising Themes are used in addition to BISAC Subject Headings to denote an audience to which a work may be of particular appeal, a time of year or event for which a work may be especially appropriate, or to further describe fictional works that have been subject-coded by genre

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