You can take a look on Ocsigen project which implements a HTML5 AST.

2012/10/5 bob zhang <bobzhang1988@gmail.com>

> Dear List,
>    Has anyone have the experience using polymorphic variant for a big Ast?
>   The benefit I can think of is  open recursion, global namespace(not in a
> module). Did anyone give a try?
> Many thanks
>
> --
> Regards
> -- Bob
>



-- 
---------------------
https://twitter.com/#!/ontologiae/
http://linuxfr.org/users/montaigne