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diff --git a/plugins/xml/xml.ml4 b/plugins/xml/xml.ml4
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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
+(*   \VV/  **************************************************************)
+(*    //   *   The HELM Project         /   The EU MoWGLI Project       *)
+(*         *   University of Bologna                                    *)
+(************************************************************************)
+(*          This file is distributed under the terms of the             *)
+(*           GNU Lesser General Public License Version 2.1              *)
+(*                                                                      *)
+(*                 Copyright (C) 2000-2004, HELM Team.                  *)
+(*                       http://helm.cs.unibo.it                        *)
+(************************************************************************)
+
+(* the type token for XML cdata, empty elements and not-empty elements *)
+(* Usage:                                                                *)
+(*  Str cdata                                                            *)
+(*  Empty (element_name, [attrname1, value1 ; ... ; attrnamen, valuen]   *)
+(*  NEmpty (element_name, [attrname1, value2 ; ... ; attrnamen, valuen], *)
+(*          content                                                      *)
+type token = Str of string
+           | Empty of string * (string * string) list
+	   | NEmpty of string * (string * string) list * token Stream.t
+;;
+
+(* currified versions of the constructors make the code more readable *)
+let xml_empty name attrs = [< 'Empty(name,attrs) >]
+let xml_nempty name attrs content = [< 'NEmpty(name,attrs,content) >]
+let xml_cdata str = [< 'Str str >]
+
+(* Usage:                                                                   *)
+(*  pp tokens None     pretty prints the output on stdout                   *)
+(*  pp tokens (Some filename) pretty prints the output on the file filename *)
+let pp_ch strm channel =
+ let rec pp_r m =
+  parser
+    [< 'Str a ; s >] ->
+      print_spaces m ;
+      fprint_string (a ^ "\n") ;
+      pp_r m s
+  | [< 'Empty(n,l) ; s >] ->
+      print_spaces m ;
+      fprint_string ("<" ^ n) ;
+      List.iter (function (n,v) -> fprint_string (" " ^ n ^ "=\"" ^ v ^ "\"")) l;
+      fprint_string "/>\n" ;
+      pp_r m s
+  | [< 'NEmpty(n,l,c) ; s >] ->
+      print_spaces m ;
+      fprint_string ("<" ^ n) ;
+      List.iter (function (n,v) -> fprint_string (" " ^ n ^ "=\"" ^ v ^ "\"")) l;
+      fprint_string ">\n" ;
+      pp_r (m+1) c ;
+      print_spaces m ;
+      fprint_string ("</" ^ n ^ ">\n") ;
+      pp_r m s
+  | [< >] -> ()
+ and print_spaces m =
+  for i = 1 to m do fprint_string "  " done
+ and fprint_string str =
+  output_string channel str
+ in
+  pp_r 0 strm
+;;
+
+
+let pp strm fn =
+  match fn with
+     Some filename ->
+      let filename = filename ^ ".xml" in
+      let ch = open_out filename in
+       pp_ch strm ch;
+       close_out ch ;
+       print_string ("\nWriting on file \"" ^ filename ^ "\" was successful\n");
+       flush stdout
+   | None ->
+       pp_ch strm stdout
+;;
+