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diff --git a/helm/matita/matitaTypes.ml b/helm/matita/matitaTypes.ml
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+(* Copyright (C) 2004-2005, 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/
+ *)
+
+(* $Id$ *)
+
+open Printf
+open GrafiteTypes
+
+  (** user hit the cancel button *)
+exception Cancel
+
+type abouts =
+  [ `Blank
+  | `Current_proof
+  | `Us
+  ]
+  
+type mathViewer_entry =
+  [ `About of abouts  (* current proof *)
+  | `Check of string (* term *)
+  | `Cic of Cic.term * Cic.metasenv
+  | `Dir of string (* "directory" in cic uris namespace *)
+  | `Uri of UriManager.uri (* cic object uri *)
+  | `Whelp of string * UriManager.uri list (* query and results *)
+  ]
+
+let string_of_entry = function
+  | `About `Blank -> "about:blank"
+  | `About `Current_proof -> "about:proof"
+  | `About `Us -> "about:us"
+  | `Check _ -> "check:"
+  | `Cic (_, _) -> "term:"
+  | `Dir uri -> uri
+  | `Uri uri -> UriManager.string_of_uri uri
+  | `Whelp (query, _) -> query
+
+let entry_of_string = function
+  | "about:blank" -> `About `Blank
+  | "about:proof" -> `About `Current_proof
+  | "about:us"    -> `About `Us
+  | _ ->  (* only about entries supported ATM *)
+      raise (Invalid_argument "entry_of_string")
+
+class type mathViewer =
+  object
+    (** @param reuse if set reused last opened cic browser otherwise 
+     *  opens a new one. default is false
+     *)
+    method show_entry: ?reuse:bool -> mathViewer_entry -> unit
+    method show_uri_list:
+      ?reuse:bool -> entry:mathViewer_entry -> UriManager.uri list -> unit
+  end