>>>>> Patrice Dumas writes:
> On Wed, Dec 15, 2021 at 07:06:37PM +0100, Kurt Hornik wrote:
>> Friends,
>>
>> calibre does not guarantee that an EPUB produced by it is valid. The
>> only guarantee it makes is that if you feed it valid XHTML 1.1 + CSS
>> 2.1 it will output a valid EPUB.
>>
>> and of course makeinfo gives HTML 4.01 Transitional: I also tried the
>> effect of going through HTML tidy to turn that into XHTML, but that did
>> not make epubcheck happy.
> My wild guess is that outputting valid XHTML directly with texi2any is
> probably the simplest way to go. This is actually probably a
> prerequisite for generating epub anyway. I recall somebody else wanting
> XHTML too.
> I could have a try, but before I would like to have an XHTML
> command-line offline validator, is there something like that existing?
See my prev msg about this.
Directly outputting valid XHTML would of course be great.
I actually had played with a pipeline which does .texi to .html, then
use HTML tidy a la
tidy --output-xhtml yes --doctype strict
to get strict XHTML, and then call calibre to create the ebook, but
epubcheck was never happy with that. After some playing around, I now
understand why: epub needs XHTML 1.1 a la
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"https://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd";>
but HTML tidy only gives
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
and the difference matters a lot: by simply changing the DOCTYPE it
seems that I can now use the W3C validator (service) to reproduce the
warnings by epubcheck.
There are two major sources of warnings in my case (using texinfo 6.8):
* The data-manual attribute in the hyperlinks
* Tables which do their header and footer inside thead and tfoot, but
not the content inside tbody (which seems valid in XHTML 1.0 but not
in 1.1).
Now if I look at e.g. <https://www.w3.org/TR/html4/sgml/loosedtd.html>
it seems that tbody should also be ok for HTML 4.01 Transitional which
texinfo currently targets, so perhaps this could be added in?
Best
-k
> --
> Pat
