[xml/sgml-pkgs] Bug#993638: Bug#993638: libxml2: XHTML 1.0 validation is broken

[Mattia Rizzolo]

On Mon, Sep 20, 2021 at 03:55:39AM +0200, Vincent Lefevre wrote:
> Control: retitle -1 libxml2: XHTML 1.0 validation is broken with w3c-dtd-xhtml's xhtml-special.ent file
> 
> This should be reproducible with w3c-dtd-xhtml's xhtml-special.ent file.
> The summary of the actual issue is below.

Yes, indeed it is.

> > The errors correspond to amp and lt.
> > 
> > Now, I don't know whether the new libxml2 version is too picky,
> > or there was a real issue with the old entity files (ignored
> > by all parsers until now?).

I bisected libxml2:

01411e7c5ea0fff181271e092f46a2138c3720ec is the first bad commit
commit 01411e7c5ea0fff181271e092f46a2138c3720ec
Author: Nick Wellnhofer <wellnhofer at aevum.de>
Date:   Mon Feb 8 20:58:32 2021 +0100

    Check for invalid redeclarations of predefined entities

https://gitlab.gnome.org/GNOME/libxml2/-/commit/01411e7c5ea0fff181271e092f46a2138c3720ec

So it's clearly intentional of libxml2 to be more picky now, and flag
this issue in the old dtd.

> > In the latter case, I think that
> > there should be a Breaks against w3c-dtd-xhtml.

On its way.



Thanks for your help in debugging this issue.

-- 
regards,
                        Mattia Rizzolo

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