> >>Do you know of any literature on the subject which I might 
> >>give a look at?
> > 
> > Yes, in
> > http://www.cis.upenn.edu/~bcpierce/
> > 
> > You can have a look at the papers on XDuce.

... Especially this one:

    http://www.cis.upenn.edu/~bcpierce/papers/regobj.ps

Another source -- even more relevant to this discussion -- is here:
   
    http://web.yl.is.s.u-tokyo.ac.jp/~sumii/pub/xperl.pdf

      -- B

-----------------------------------------------------------------------------
BENJAMIN C. PIERCE, Professor
Dept. of Computer & Information Science                bcpierce@cis.upenn.edu
University of Pennsylvania                                    +1 215 898-2012
200 South 33rd St.                                       Fax: +1 215 898-0587
Philadelphia, PA 19104, USA                http://www.cis.upenn.edu/~bcpierce
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