After the large upheaval of moving to 13-digit ISBNs, and given that they're now EAN-13 codes as well, the chances of the ISBN format changing in the next decade is as close to zero as makes no difference.
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Originally Posted by poohbear_nc
It would seem workable to have a common 9 or 12 digit base ISBN for an ebook - with an additional last digit/letter changed to reflect the format it's in. If in some fit of logic the last digit/letter were standardized for format, it could make search filters quite effective for sorting by format.
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