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diff --git a/helm/ocaml/lexicon/lexiconMarshal.ml b/helm/ocaml/lexicon/lexiconMarshal.ml
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+(* Copyright (C) 2005, 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/
+ *)
+
+exception Checksum_failure of string
+exception Corrupt_lexicon of string
+exception Version_mismatch of string
+
+type lexicon = LexiconAst.command list
+
+let marshal_flags = []
+
+let rehash_cmd_uris =
+  let rehash_uri uri = UriManager.uri_of_string (UriManager.string_of_uri uri) in
+  function
+  | LexiconAst.Interpretation (loc, dsc, args, cic_appl_pattern) ->
+      let rec aux =
+        function
+        | CicNotationPt.UriPattern uri ->
+            CicNotationPt.UriPattern (rehash_uri uri)
+        | CicNotationPt.ApplPattern args ->
+            CicNotationPt.ApplPattern (List.map aux args)
+        | CicNotationPt.VarPattern _
+        | CicNotationPt.ImplicitPattern as pat -> pat
+      in
+      let appl_pattern = aux cic_appl_pattern in
+      LexiconAst.Interpretation (loc, dsc, args, appl_pattern)
+  | LexiconAst.Notation _
+  | LexiconAst.Alias _ as cmd -> cmd
+  | cmd ->
+      prerr_endline "Found a command not expected in a .lexicon:";
+      prerr_endline (LexiconAstPp.pp_command cmd);
+      assert false
+
+(** .lexicon file format
+ * - an integer -- magic number -- denoting the version of the dumped data
+ *   structure. Different magic numbers stand for incompatible data structures
+ * - an integer -- checksum -- denoting the hash value (computed with
+ *   Hashtbl.hash) of the string representation of the dumped data structur
+ * - marshalled data: list of LexiconAst.command
+ *)
+
+let save_lexicon ~fname lexicon =
+ let ensure_path_exists path =
+   let dir = Filename.dirname path in
+   HExtlib.mkdir dir
+ in
+ ensure_path_exists fname;
+ let oc = open_out fname in
+ let marshalled = Marshal.to_string (List.rev lexicon) marshal_flags in
+ let checksum = Hashtbl.hash marshalled in
+ output_binary_int oc LexiconAst.magic;
+ output_binary_int oc checksum;
+ output_string oc marshalled;
+ close_out oc
+
+let load_lexicon ~fname =
+  let ic = open_in fname in
+  HExtlib.finally
+    (fun () -> close_in ic)
+    (fun () ->
+      try
+        let lexicon_magic = input_binary_int ic in
+        if lexicon_magic <> LexiconAst.magic then raise (Version_mismatch fname);
+        let lexicon_checksum = input_binary_int ic in
+        let marshalled = HExtlib.input_all ic in
+        let checksum = Hashtbl.hash marshalled in
+        if checksum <> lexicon_checksum then raise (Checksum_failure fname);
+        let (lexicon:lexicon) =
+          Marshal.from_string marshalled 0
+        in
+        List.map rehash_cmd_uris lexicon
+      with End_of_file -> raise (Corrupt_lexicon fname))
+    ()
+