how to set fonts for a language

[François Patte]

Bonjour,

I use emacs to publish multilingual texts with xelatex. I have
customized some keys in order to switch from a script to another one,
like this:

(global-set-key [f12]
  (lambda () (interactive) (set-input-method "bengali-itrans")))

So far, it works perfectly, emacs uses some Bengali fonts installed on
debian sid.

I want now to use some special otf/ttf fonts in association with this
switch: when I press f12 key, I want that emacs use these fonts for
displaying the text. Is that possible and how.


Thanks for any help.
-- 
François Patte
Université Paris Descartes