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Re: texi to epub

From: Patrice Dumas
Subject: Re: texi to epub
Date: Sat, 18 Dec 2021 23:20:11 +0100 
On Sat, Dec 18, 2021 at 01:58:30PM -0800, Per Bothner wrote:
> 
> 
> On 12/18/21 13:01, Patrice Dumas wrote:
> > It seems that it does not change the work required compared to XHTML 1.1
> > which is to have a correct XML document.  Something I cannot find,
> > however, is what to put at the beginning to be able to check validity
> > of the resulting document if it is HTML5 XML.  Can you please tell me?
> 
> As far as I can tell, you don't need to put anything at the start:
> https://html.spec.whatwg.org/multipage/xhtml.html#the-xhtml-syntax
> A validator should allow you to specify what you want to validate against.
> 
> This should be OK:
> 
>   <?xml version="1.0" encoding="UTF-8"?>
>   <!DOCTYPE html>

I tried that with the https://validator.w3.org/, also using .xhtml as
extension as it seems that it is what makes the w3c validator consider
that it is XML, with and without <?xml?>, and I get:
    Schema Error: XML document with no namespace; cannot determine any schema 
to use for validation.

Any idea on what is wrong?

> For "polyglot" output, leave off the <?xml?> declaration.


Also, what could I use for offline validation?  The w3c-markup-validator
package does not seem to handle HTML5, and the vnu 
https://validator.github.io/validator/
validator does not seem to be packages in debian.

-- 
Pat
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