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

[Andy Moreton]

On Wed 25 Nov 2020, Vincent Lefevre wrote:

> 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

That repo contains html5-schema.el which appears to do some nXML setup
for those datatypes. Did you try using that to configure things ?

    AndyM