Quote:
Originally Posted by user2178319
Thanks so much for the quick response. In this case, the publisher is selling the book directly of its website and anticipates that most people will be loading it onto a Kobo. We would like to provide a book that's best suited for the Kobo, though I'm not sure that's possible.
Also, thanks for the note about the Calibre plugin I actually tested that out and it caused the same validation error since it add that same line to the cover file in the opf.
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Then I suggest you use the KEPUB Output plugin, since it apparently does several things important to making a good KEPUB beyond merely renaming.
As for the validation checks -- just build yourself a nice EPUB2/3 and make sure that validates, then when it comes time to upload the finished product,
upload the EPUB and a KEPUB built from the EPUB. Don't worry about validation errors, KEPUB isn't EPUB and hence doesn't need to validate.
