[xml/sgml-pkgs] Bug#1111803: libxml2: xmllint with both --valid and --relaxng yields "Relax-NG validity error : ID ... redefined" errors

[Vincent Lefevre]

Control: retitled -1 libxml2-16: xmllint with both --valid and --relaxng yields "Relax-NG validity error : ID ... redefined" errors for IDs defined via an entity reference

On 2025-08-22 09:27:55 +0200, Vincent Lefevre wrote:
> After the upgrade of libxml2 in unstable, xmllint with both --valid
> and "--relaxng ..." yields "Relax-NG validity error : ID ... redefined"
> errors. With just one of them (i.e. either DTD validation or Relax-NG
> validation), the document validates. So this is obviously a bug (and
> there were no such errors before the upgrade).
> 
> Note: the other options I'm using are
>   --nonet --noout --noent --xinclude --loaddtd --dtdattr

Something important:

There is something like

<!ENTITY elem SYSTEM "elem.xml">

in the DTD, and

&elem;

in the contents. If I replace the "&elem;" by the contents of elem.xml
(without the XML prolog), then the error disappears.

And the errors concern only the IDs defined via this entity reference.

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Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / Pascaline project (LIP, ENS-Lyon)