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diff --git a/helm/ocaml/mathql_interpreter/mQIMap.ml b/helm/ocaml/mathql_interpreter/mQIMap.ml
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+(* 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>
+ *)
+
+(* $Id$ *)
+
+module U = MQueryUtil
+
+type pg_map = (MathQL.path * (bool * string * string option)) list
+
+type pg_tables = (bool * string) list
+
+type pg_alias = (string * string) list
+
+let empty_map () = [], []
+
+let read_map () =
+   let map = Helm_registry.get "mathql_interpreter.db_map" in
+   let ich = open_in map in 
+   let rec aux r s =
+      let d = input_line ich in 
+      match Str.split (Str.regexp "[ \t]+") d with
+	 | []                  -> aux r s
+	 | "#" :: _            -> aux r s
+	 | t ::      "<-" :: p -> aux ((p, (false, t, None)) :: r) s 
+	 | t :: c :: "<-" :: p -> aux ((p, (false, t, Some c)) :: r) s
+	 | t ::      "<+" :: p -> aux ((p, (true, t, None)) :: r) s 
+	 | t :: c :: "<+" :: p -> aux ((p, (true, t, Some c)) :: r) s
+	 | [a; "->"; t]        -> aux r ((a, t) :: s) 
+	 | ["->"]              -> r, s
+	 | _                   -> raise (Failure "MQIMap.read_map")
+   in
+   let pgm, pga = aux [] [] in
+   close_in ich;
+   pgm, pga
+
+let comp c1 c2 = match c1, c2 with
+   | (_, t1), (_, t2) when t1 < t2 -> U.Lt
+   | (_, t1), (_, t2) when t1 > t2 -> U.Gt
+   | (b1, t), (b2, _)              -> U.Eq (b1 || b2, t)
+
+let get_tables pgm p =
+   let aux l = function
+      | q, (b, t, _) when q = p -> U.list_join comp l [(b, t)]
+      | _, _                    -> l
+    in
+    List.fold_left aux [] pgm  
+
+let rec refine_tables l1 l2 = 
+   U.list_meet comp l1 l2
+      
+let default_table = function
+   | [(_, a)] -> a
+   | l        -> 
+      try List.assoc true l 
+      with Not_found -> raise (Failure "MQIMap.default_table")
+
+let get_field pgm p t =
+   let aux = function
+      | q, (_, u, _) when q = p && u = t -> true
+      | _                                -> false
+   in 
+   match List.filter aux pgm with
+      | [_, (_, _, None)]   -> "" 
+      | [_, (_, _, Some c)] -> c
+      | _                   -> raise (Failure "MQIMap.get_field")
+
+let resolve pga a =
+   try List.assoc a pga with Not_found -> a