Thread: How to add ISBN to an EPUB file, to have it visible on my Elipsa?
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Old 10-05-2021, 08:24 PM   #2
davidfor
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Join Date: Jul 2011
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Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos
None of those look to be valid ways of defining the ISBN in the OPF. At least, they are not how calibre does them. Personally, I don't care about the ISBN on the device, as there is no use for it there, so I haven't checked it for a while (and honestly, other than an identifier to help get metadata, it's pretty useless). But, testing it now, what calibre puts in works.

For epub 2, this is:

Code:
<dc:identifier id="isbn" opf:scheme="isbn">9781780891231</dc:identifier>
That does have the "unique-identifier" set to "isbn" in the package, but, that is not necessary.

For epub 3, it is:

Code:
<dc:identifier>isbn:9780515135282</dc:identifier>
The device read both of those as the ISBN and displays them in the details.

And the above works fro sideloaded kepubs as well.
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