Quote:
Originally Posted by James_Wilde
Thanks, Ducks. And that puts the ISBN into the content.opf file as the unique identifier?
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No, it adds it as a new <identifier> element. You can have several in the OPF. The one that is used as the book's "unique" ID is always a randomly generated
UUID except if you set the "CustomID" field in the Meta Editor. Then that <identifier> will be marked as the main/unique one.