(* 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/.
 *)

(*  AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
 *)

val mql_true      : MathQL.result

val mql_false     : MathQL.result

val set_sub       : MathQL.result -> MathQL.result -> MathQL.result

val set_meet      : MathQL.result -> MathQL.result -> MathQL.result

val set_eq        : MathQL.result -> MathQL.result -> MathQL.result

val set_union     : 'a list -> 'a list -> 'a list

val mql_subj      : MathQL.value -> MathQL.result

val mql_union     : ('a * 'b list) list -> ('a * 'b list) list -> 
                    ('a * 'b list) list

val mql_prod      : MathQL.attribute_set -> MathQL.attribute_set ->
                    MathQL.attribute_set

val mql_intersect : MathQL.result -> MathQL.result -> MathQL.result

val mql_diff      : MathQL.result -> MathQL.result -> MathQL.result

val iter          : ('a -> 'b list) -> 'a list -> 'b list 

val mql_iter      : ('c -> ('a * 'b list) list) -> 'c list -> 
                    ('a * 'b list) list 

val mql_iter2     : ('c -> 'd -> ('a * 'b list) list) -> 'c list -> 
                    'd list -> ('a * 'b list) list 

val xor           : MathQL.result -> MathQL.result -> MathQL.result 

exception NumberError of MathQL.result

val int_of_set    : MathQL.result -> int