Quote:
Originally Posted by roger64
To answer to DiapDealer, the EPUB3 produced with writer2xhtml 1.5.2. have an EPUB3 dc format line written in the metadata (opf file) which makes easy to identify their version.
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It's not that easy for Sigil. As I said, it needs to be able to parse html and doctypes properly
even when no opf is present.
I think you'll notice that if you open your original writer2xhtml epub3 output directly with Sigil, that there's no problem. It's only after calibre removes the doctype that Sigil corrupts it (note: I'm not finger-pointing. I'm well aware of Kovid's decision to not use doctypes in calibre's editor and I respect his decision).
This will not be an issue when Sigil is fully epub3-"aware."
Until it is, you should avoid doing anything other than the very simplest editing of epub3's using Sigil. And you should avoid opening files that have no doctype (unless it's an epub2) until that time as well.