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diff --git a/helm/uwobo/src/ocaml/uwobo_styles.ml b/helm/uwobo/src/ocaml/uwobo_styles.ml
deleted file mode 100644
index 218da1786..000000000
--- a/helm/uwobo/src/ocaml/uwobo_styles.ml
+++ /dev/null
@@ -1,118 +0,0 @@
-
-(* Copyright (C) 2002, 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/.
- *)
-
-open Printf;;
-
-exception Stylesheet_not_found of string;;
-exception Stylesheet_already_in of string;;
-
-class styles =
-  object (self)
-    (* INVARIANT: 'stylesheets' and 'uris' are in sync *)
-
-    inherit Uwobo_common.threadSafe
-
-    val mutable stylesheets = []
-    val mutable uris = []
-    val domImpl = Gdome.domImplementation ()
-
-      (** process an XSLT stylesheet *)
-    method private process uri = domImpl#createDocumentFromURI ~uri ()
-
-    method get keys =
-      self#doReader (lazy (
-        let rev_keys = List.rev keys in
-        let last_key = List.hd rev_keys in
-        let p_stylesheets =
-          List.fold_left
-            (fun collected_styles key ->
-              let (key, stylesheet) =
-                try
-                  List.find (fun (k, _) -> k = key) stylesheets
-                with Not_found -> raise (Stylesheet_not_found key)
-              in
-              (key, Gdome_xslt.processStylesheet stylesheet)::collected_styles)
-            []
-            rev_keys
-        in
-        let last_stylesheet =
-          snd (List.find (fun (k, _) -> k = last_key) stylesheets)
-        in
-        (p_stylesheets, last_stylesheet)
-      ))
-
-    method add key uri =
-      self#doWriter (lazy (
-        if (List.mem_assoc key uris) then
-          raise (Stylesheet_already_in key)
-        else begin
-          uris <- (key, uri) :: uris;
-          stylesheets <- (key, self#process uri) :: stylesheets
-        end
-      ))
-
-    method remove key =
-      self#doWriter (lazy (
-        if not (List.mem_assoc key uris) then
-          raise (Stylesheet_not_found key)
-        else begin
-          uris <- List.remove_assoc key uris;
-          stylesheets <- List.remove_assoc key stylesheets
-        end
-      ))
-
-    method removeAll =
-      self#doWriter (lazy (
-        uris <- [];
-        stylesheets <- []
-      ))
-
-    method list =
-      let uris = self#doReader (lazy (
-        uris
-      ))
-      in
-      List.map
-        (fun (key, uri) -> sprintf "key = %s, uri = %s" key (List.assoc key uris))
-        uris
-
-    method reload key =
-      self#doWriter (lazy (
-        (try
-          let uri = List.assoc key uris in
-          stylesheets <-
-            (key, self#process uri) :: (List.remove_assoc key stylesheets)
-        with Not_found ->
-          raise (Stylesheet_not_found key))
-      ))
-
-    method reloadAll =
-      self#doWriter (lazy (
-        stylesheets <- List.map (fun (key, uri) -> (key, self#process uri)) uris
-      ))
-
-  end
-