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Re: XHTML validation (was: texi to epub)

From: Kurt Hornik
Subject: Re: XHTML validation (was: texi to epub)
Date: Thu, 16 Dec 2021 18:20:34 +0100

>>>>> Jacob Bachmeyer writes:

What I ended up doing is set up a local W3C service.  On Debian, after

apt-get install w3c-markup-validator
apt-get install libapache2-mod-perl2

See /usr/share/doc/w3c-markup-validator/README.Debian:
  to say
    Allow Private IPs = yes

you can then work with <http://localhost/w3c-validator/check>.

I actually have written an R package to interface the local check
service, but Dr Google finds


and indeed after downloading something like

  python3 validator-runner.py FILE

works like a charm :-)


> Patrice Dumas wrote:
>> 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?

> If I remember correctly, the "offline" version of the W3C validator (a 
> DTD bundle is available for download, to be used with OpenSP nsgmls) can 
> also do XHTML 1.1, although I am unsure about exactly how thorough the 
> validation will be for the XML constraints.  There is some information 
> at <URL:http://validator.w3.org/docs/devel.html> on the topic.  I do 
> know that Emacs' built-in support for HTML validation relied on nsgmls 
> and the W3C DTD collection when I last checked.

> -- Jacob

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