(* Copyright (C) 2004, 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://helm.cs.unibo.it/
 *)

(* Cic.Type of universe *)
type universe

(* returns a fresh universe and puts it in the working graph *)
val fresh: unit -> universe

(* add eq/ge/gt constraints to the woring graph *)
val add_eq: universe -> universe -> bool
val add_ge: universe -> universe -> bool
val add_gt: universe -> universe -> bool

(* prints the graphs *)
val print_global_graph: unit -> unit
val print_working_graph: unit -> unit

type universe_graph
val get_working: unit -> universe_graph
val set_working: universe_graph -> unit

val directly_to_env_begin: unit -> unit
val directly_to_env_end: unit -> unit

val reset_working:  unit -> unit