nxml-mode and Mule-UCS

Mule-UCS is an eLisp to support UTF-8 on Emacs21. It's the only way to edit UTF-8 encodings except using the snapshot of Emacs22.
Today I tried to use the nxml-mode and recognized that the nxml-mode is incompatible with the Mule-UCS (debian package explanation tells so). Apparently, the nxml-mode developper has no will to support Mule-UCS. I'm affraid that I should keep using the psgml-mode for a while.