I can confirm this bug persists into Ubuntu 12.04.
My .emacs file associates
(autoload 'xml-mode "psgml" "Major mode to edit XML files." t)
but when I open an XML document, Emacs invokes nxml-mode, and PSGML is
not longer accessible via xml-mode.
This is a show-stopper for production use of Emacs as delivered.
Nicolas Quiniou's suggestion works: invoking sgml-mode (which is also
bound to psgml), closing the buffer, and revisiting it.
Neil Roeth's proposal of removing the defalias of xml-mode to nxml-mode
from nxml-mode.el would probably work, but although this line is in the
distributed nxml-mode.elc, I cannot find it in James Clarke's original
source of nxml at http://www.thaiopensource.com/download/ -- is that
defalias an addition by some third party?
///Peter
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