> You're probably referring to the wonderful nXML mode
But wasn't there an issue where early nxml mode for Emacs would not support the Relax NG using the XML syntax? I vaguely remember the compact Relax NG syntax being supported but not the XML one. And for whatever reason that XML syntax for Relax NG was supported under XEmacs.
It was really a long time ago so my memory is very fussy but something like that. Since then I switched back to Emacs and I do use nxml-mode (I don't use Relax NG anymore though).
But wasn't there an issue where early nxml mode for Emacs would not support the Relax NG using the XML syntax? I vaguely remember the compact Relax NG syntax being supported but not the XML one. And for whatever reason that XML syntax for Relax NG was supported under XEmacs.
It was really a long time ago so my memory is very fussy but something like that. Since then I switched back to Emacs and I do use nxml-mode (I don't use Relax NG anymore though).