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diff --git a/helm/ocaml/hbugs/test/test_serialization.ml b/helm/ocaml/hbugs/test/test_serialization.ml
new file mode 100644
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+++ b/helm/ocaml/hbugs/test/test_serialization.ml
@@ -0,0 +1,70 @@
+(*
+ * Copyright (C) 2003:
+ *    Stefano Zacchiroli <zack@cs.unibo.it>
+ *    for the HELM Team http://helm.cs.unibo.it/
+ *
+ *  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/
+ *)
+
+open Pxp_document;;
+open Pxp_dtd;;
+open Pxp_types;;
+open Pxp_yacc;;
+
+open Printf;;
+
+let test_data = "HBUGS_MESSAGES.xml" ;;
+
+let test_message (n:('a Pxp_document.extension as 'b) Pxp_document.node as 'a) =
+  try
+    let msg_string =
+      let buf = Buffer.create 1000 in
+      n#write (`Out_buffer buf) `Enc_utf8;
+      Buffer.contents buf
+    in
+    let msg = Hbugs_messages.msg_of_string msg_string in
+    let pp = Hbugs_messages.string_of_msg msg in
+    let msg' = Hbugs_messages.msg_of_string pp in
+    if (msg <> msg') then
+      prerr_endline
+        (sprintf "Failure with msg %s"
+          (match n#node_type with T_element name -> name | _ -> assert false))
+  with e ->
+    prerr_endline
+      (sprintf "Failure with msg %s: uncaught exception %s"
+        (match n#node_type with T_element name -> name | _ -> assert false)
+        (Printexc.to_string e))
+;;
+
+let is_xml_element n =
+  match n#node_type with T_element _ -> true | _ -> false
+;;
+
+let root =
+  parse_wfcontent_entity default_config (from_file test_data) default_spec
+in
+printf "Testing all messages from %s ...\n" test_data; flush stdout;
+List.iter test_message (List.filter is_xml_element root#sub_nodes);
+printf "Done!\n"
+;;
+