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diff --git a/helm/ocaml/mathql/avsUtil.ml b/helm/ocaml/mathql/avsUtil.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>
+ *)
+
+module I = MathQL.I
+
+(* strings ******************************************************************)
+
+let avs_of_string s = I.make s I.grp_empty 
+
+let string_of_avs r =
+   match I.peek r with 
+      | I.Single (s, _) -> Some s
+      | _               -> None
+
+(* boolean constants  *******************************************************)
+
+let bool_of_avs r = r <> I.empty
+
+let avs_of_bool = function
+   | true  -> I.make "" I.grp_empty
+   | false -> I.empty
+
+let val_false = avs_of_bool false
+
+let val_true = avs_of_bool true
+
+(* iterators ****************************************************************)
+
+let grp_iter f al =
+   List.fold_left (fun s a -> I.grp_union s (f a)) I.grp_empty al
+
+let grp_iter2 f al bl = 
+   List.fold_left2 (fun s a b -> I.grp_union s (f a b)) I.grp_empty al bl
+
+let iter f al = List.fold_left (fun s a -> I.union s (f a)) I.empty al
+
+let append_iter f al = List.fold_left (fun s a -> I.append (f a) s) I.empty al
+
+(* other ********************************************************************)
+
+let grp_make_x p vl = grp_iter (I.grp_make p) vl
+
+let x_grp_make_x p rs = 
+   let aux g s _ = I.grp_make p s in
+   I.iter aux I.grp_empty rs
+
+let make_x s gl = iter (I.make s) gl
+
+let count v = I.iter (fun n _ _ -> succ n) 0 v
+
+let subj v = iter (fun s -> I.make s I.grp_empty) v
+
+(* numeric operations *******************************************************)
+
+exception NumberError of MathQL.result
+
+let avs_of_int i = I.make (string_of_int i) I.grp_empty
+
+let int_of_avs r =
+   try match (I.peek r) with 
+      | I.Empty
+      | I.Many _        -> raise (Failure "int_of_string")
+      | I.Single (s, _) -> MQueryUtil.int_of_string s
+   with Failure "int_of_string" -> raise (NumberError r)