Thread: 3.0 Validator validating under 2.0.1 rules?
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Old 10-16-2022, 09:35 AM   #6
Doitsu
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Quote:
Originally Posted by justaddwater View Post
Even though these validators claim to be 3.0 validators, they are all giving me this note along with the errors: "Validating using EPUB version 2.0.1 rules.(https://gi thub.com/w ±/epubcheck)"
EPUBCheck automatically detects the epub version. If it used EPUB 2.0.1 rules, your epub is an epub2 book.
Open your book in an editor, select the .opf file and double-check the following line:
Code:
<package version="2.0" ...
If it looks likes this, you've exported an epub2 book.
You can still convert it to an epub3 book:
Calibre: Polish book > Upgrade book internals
Sigil: ePub3-itizer plugin
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