> Date: Thu, 12 Sep 96 01:33:12 EDT
> From: firstname.lastname@example.org
> > >is required for many processing instructions. (An alternative may be to
> > >allow a character reference to be entered within a PI, but this would make
> > >XML incompatible with SGML.)
> Not at all. SGMLdoesn't forbdg <?xxx &3901;> as far as I can tell.
> Or does it?
It doesn't forbid it, but it wouldn't be recognized as a character
reference. You can use a PI entity if you want to get a > in a PI.