(* 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>
 *)

type uri = string
type position = string
type depth = string
type sort = string 

type spec = MustObj  of uri list * position list * depth list
          | MustSort of sort list * position list * depth list
          | MustRel  of position list * depth list
          | OnlyObj  of uri list * position list * depth list
          | OnlySort of sort list * position list * depth list
          | OnlyRel  of position list * depth list
          | Universe of position list 

type builtin_t = MainHypothesis
               | InHypothesis
	       | MainConclusion
	       | InConclusion
	       | InBody
	       | Set
	       | Prop
	       | Type

val locate  : string -> MathQL.query

val compose : spec list -> MathQL.query

val builtin : builtin_t -> string

(* interface for the old constraints  ***************************************)

type old_depth = int option
 
type r_obj = uri * position * old_depth 
type r_rel = position * old_depth
type r_sort = position * old_depth * sort 

type must_restrictions = (r_obj list * r_rel list * r_sort list)
type only_restrictions =
 (r_obj list option * r_rel list option * r_sort list option)
type universe = position list option

val query_of_constraints : universe -> must_restrictions -> only_restrictions -> MathQL.query