(* Copyright (C) 2000, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM 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
 * of the License, or (at your option) any later version.
 * 
 * HELM 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 HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://cs.unibo.it/helm/.
 *)

(******************************************************************************)
(*                                                                            *)
(*                               PROJECT HELM                                 *)
(*                                                                            *)
(*                     Ferruccio Guidi <fguidi@cs.unibo.it>                   *)
(*                                 30/04/2002                                 *)
(*                                                                            *)
(*                                                                            *)
(******************************************************************************)

exception Discard  

type levels_spec = (string * bool * int) list

val levels_of_term    : Cic.metasenv -> Cic.context -> Cic.term -> levels_spec

val string_of_levels  : levels_spec -> string -> string

val set_log_file      : string -> unit

(* the callback function must return false iff the query must be skipped *)
val set_confirm_query : (MathQL.query -> bool) -> unit

val execute_query     : MathQL.query -> MathQL.result

val locate            : string -> MathQL.result

val backward          : Cic.metasenv -> Cic.context -> Cic.term -> int -> MathQL.result

val get_query_info    : unit -> string list