Quote:
Originally Posted by chaley
Jim, are you referring to the <dc:identifier... tag in the OPF file? Calibre puts two of these into a book, one for ISBN and one for calibre's ID. The ISBN one might be empty, and is almost certainly so for newspaper articles. The calibre ID is guaranteed to be unique.
Calibre also includes the 'unique-identifier' attribute, telling clients which identifier is preferred. Are you checking that?
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Freda will ignore empty identifiers, but beyond that, it doesn't make any particular effort to use a provider's preferred ID scheme. If a book supplies several non-empty IDs, I'd expect Freda just to use the one mentioned last in the OPF file.