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As a follow-up to my earlier post about the lack of a way to tie together different versions of the same text in ReaderWare, part of the problem is a lack of an official unique identifier for the content, as opposed to the format. I.e., if a book is published as a hardcover, trade paperback, mass-market paperback, and ebook, they will probably each have their own ISBN. I suspect that if a book is published as Mobipocket and also as eBookwise, they will also have distinct ISBNs. I think the Library of Congress numbers are also different, but I'm less sure about this (maybe one of our librarian members will know).
Perhaps along with arguing for a single standard ebook format, e.g. ePub, we also need to be arguing for a single way of uniquely referencing the content of a text across multiple formats. A standard way of referencing different editions or translations of the same work could also be quite useful, I think.
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