(* First-order terms, headers.
   Copyright (C) 2003-2004 Jean Goubault-Larrecq and LSV, CNRS UMR 8643 & ENS Cachan
   and INRIA Futurs projet SECSI.

   This file is part of ispi.

   ispi is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   ispi is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with ispi; see the file COPYING.  If not, write to
   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*)

infix 0 $

datatype ''var term = V of ''var
       | $ of string * ''var term list;

extern val tvars : ''var term -> ''var set;
extern val tsubst : (''var -m> ''var term) -> ''var term -> ''var term;

extern val print_term : ('a outstream * (''var -> string))
	   -> ''var term -> unit;
extern val print_atom : ('a outstream * (''var -> string))
	   -> ''var term -> unit;