(* 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/.
 *)

  (** XXX WARNING: non-reentrant *)
type coerc_carr = Uri of UriManager.uri | Sort of Cic.sort | Term of Cic.term
exception EqCarrNotImplemented of string
exception EqCarrOnNonMetaClosed
val eq_carr: coerc_carr -> coerc_carr -> bool
val coerc_carr_of_term: Cic.term -> coerc_carr
val name_of_carr: coerc_carr -> string

val use_coercions: bool ref (** initial status is true *)
 
val to_list:
  unit -> 
    (coerc_carr * coerc_carr * UriManager.uri) list

val add_coercion:
  coerc_carr * coerc_carr * UriManager.uri -> unit

val remove_coercion:
  (coerc_carr * coerc_carr * UriManager.uri -> bool) -> unit

val find_coercion:
  (coerc_carr * coerc_carr -> bool) -> UriManager.uri list