ONIX codelists Issue 50

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List Code Heading Add Mod ?
27 Subject scheme identifier
Used with <SubjectSchemeIdentifier> <b067>
27 20 Keywords
For indexing and search purposes, not normally intended for display. Where multiple keywords or keyword phrases are sent, this should be in a single instance of the <SubjectHeadingText> element, and it is recommended that they should be separated by semi-colons (this is consistent with Library of Congress preferred practice)
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