Regarding nxml-mode in debian, I think that there is a misunderstanding.
There is indeed an individual debian package for nxml-mode. It has to be used with the emacs22 debian package since emacs22 doesn't provide nxml-mode.
The emacs-snapshot debian package does include its own version of nxml-mode, and the nxml-mode individual package doesn't handle coexistence gracefully. So people using emacs-snapshot should remove the individual nxml-mode package.
Regarding nxml-mode in debian, I think that there is a misunderstanding.
There is indeed an individual debian package for nxml-mode. It has to be used with the emacs22 debian package since emacs22 doesn't provide nxml-mode.
The emacs-snapshot debian package does include its own version of nxml-mode, and the nxml-mode individual package doesn't handle coexistence gracefully. So people using emacs-snapshot should remove the individual nxml-mode package.