Quote:
Originally Posted by MikeT!
I validate with Sigil, there are some error in the opf file
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If you've used the built-in Sigil validator (FlightCrew), you'll always get error messages for epub3 files, because it can't handle epub3-only attributes.
That's why I suggested
epubcheck online, which can handle epub2 and epub3 files.
BTW, there's a Sigil
epub3 export plugin that you can use to convert an epub2 file to an epub3 file.
Also check out the free SMIL-based epub3 audio books on the
Read Beyond website.