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

[Lars Ingebrigtsen]

Vincent Lefevre <vincent@vinc17.net> writes:

> Create a file foo.xml containing: <root></root>
>
> Then type "emacs -Q foo.xml", and in the XML menu,
> Set Schema → File..., and select xhtml5.rnc, which
> can be obtained here:
>
>   https://github.com/emacsmirror/html5-schema
>
> (described as "Add HTML5 schemas for use by nXML").
> I get the following error:
>
> Incorrect schema. Unknown datatype library http://whattf.org/datatype-draft

I'm unable to reproduce this bug in Emacs 27.2 and Emacs 28.

Here's what I did:

cd /tmp
git clone https://github.com/emacsmirror/html5-schema
emacs -Q foo.xml
M-x rng-set-schema-file RET /tmp/html5-schema/xhtml5.rnc RET

It asks me whether to save the location, and I answer "y", and I get no
error.

Do you have a more precise recipe for reproducing the error?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no