Thread: A warning from epubcheck
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Old 06-01-2020, 09:40 AM   #3
Doitsu
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Quote:
Originally Posted by 7dau253mrwry4spf View Post
I created an epub with calibre. Epubcheck 4.2.2 finds the following warning:
The primary id of your book is marked as a UUID, but it isn't one. To fix this problem delete the opf:scheme="uuid" attribute from the <dc:identifier> tag.
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