bug#44874: 27.1; nXML: error when setting the xhtml5.rnc schema

[Vincent Lefevre]

On 2020-11-29 11:07:27 +0100, Lars Ingebrigtsen wrote:
> Vincent Lefevre <vincent@vinc17.net> writes:
> 
> > On 2020-11-27 09:09:12 +0100, Lars Ingebrigtsen wrote:
> >> But isn't the problem here that these .rnc files are just old and
> >> outdated, and refers to datatype libraries that no longer exists?
> >
> > No, it appears that these libraries have never existed:
> >
> >   
> > https://web.archive.org/web/20130901000000*/http://whattf.org/datatype-draft
> >
> > says
> >
> >   Not Found
> >
> >   The requested URL /whattf/datatype-draft was not found on this server.
> 
> Well, archive.org doesn't have anything resembling a complete archive of
> the net, so that doesn't really mean that much.

The fact that archive.org isn't complete is irrelevant here. The point
is that it checked the http://whattf.org/datatype-draft URL over the
years from 2013 (probably because it was first referenced at that time)
to 2020, and each time, it got a 404 Not Found error, which explicitly
means that the document at this URL did not exist.

> In any case, this means that the .rnc files your using are invalid,
> so is this a bug in Emacs?

Since this schema was working in the past with nXML (while
http://whattf.org/datatype-draft did not exist) and was designed
for nXML, why would it be invalid?

Note: this is also referenced there:

  https://elpa.gnu.org/packages/html5-schema.html

where there is the same issue with

  https://elpa.gnu.org/packages/html5-schema-0.1.tar

(but I suppose that the .rnc files are the same).

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