Quote:
Originally Posted by KevinH
epubcheck 3.X has a bug. An ncx under epub3 is allowed to have a DOCTYPE as it is required for fallback.
This bug is fixed in epubcheck 4. So an proper daisy ncx with full doctype is allowed in epub3. Check the official epucheck 3.1 bug reports for details
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Well,
what I linked to is precisely an issue in the official epubcheck issue tracker that references the part of the EPUB 3 spec where such limitation is detailed, and where Matt Garrish, one of the editors of the EPUB 3 spec, weights in confirming that EPUB 3 must omit the NCX DOCTYPE, with nobody counter arguing, barely a month ago. That issue is still open but the only other one that I could find on the subject is
this other issue, already closed, where the same prohibition is stated. What specific bug report do you refer to?
None of the EPUB 3 samples by the IDPF that have an NCX have its DOCTYPE in it, and there is no backwards compatibility issue as no ereader depends on its presence or its absence.