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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/
+ *)
+
+(* $Id$ *)
+
+type lexicon = LexiconAst.command list
+
+let format_name = "lexicon"
+
+let save_lexicon_to_file ~fname lexicon =
+  HMarshal.save ~fmt:format_name ~version:LexiconAst.magic ~fname lexicon
+
+let load_lexicon_from_file ~fname =
+  let raw = HMarshal.load ~fmt:format_name ~version:LexiconAst.magic ~fname in
+  (raw: lexicon)
+
+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
+
+let save_lexicon ~fname lexicon = save_lexicon_to_file ~fname (List.rev lexicon)
+
+let load_lexicon ~fname =
+  let lexicon = load_lexicon_from_file ~fname in
+  List.map rehash_cmd_uris lexicon
+