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diff --git a/components/getter/http_getter_storage.mli b/components/getter/http_getter_storage.mli
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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/
+ *)
+
+(** Transparent handling of local/remote getter resources.
+ * Configuration of this module are prefix mappings (see
+ * Http_getter_env.prefixes). All functions of this module take as input an URI,
+ * resolve it using mappings and act on the resulting resource which can be
+ * local (file:/// scheme or relative path) or remote via HTTP (http:// scheme).
+ *
+ * Each resource could be either compressed (trailing ".gz") or non-compressed.
+ * All functions of this module will first loook for the compressed resource
+ * (i.e. the asked one ^ ".gz"), falling back to the non-compressed one.
+ *
+ * All filenames returned by functions of this module exists on the filesystem
+ * after function's return.
+ *
+ * Almost all functions may raise Resource_not_found, the following invariant
+ * holds: that exception is raised iff exists return false on a given resource
+ * *)
+
+exception Resource_not_found of string * string  (** method, uri *)
+
+  (** @return a list of string where dir are returned with a trailing "/" *)
+val ls: local:bool -> string -> string list
+
+
+  (** @return the filename of the resource corresponding to a given uri. Handle
+   * download and caching for remote resources.
+   * @param find if set to true all matching prefixes will be searched for the
+   * asked resource, if not only the best matching prefix will be used. Note
+   * that the search is performed only if the asked resource is not found in
+   * cache (i.e. to perform the find again you need to clean the cache).
+   * Defaults to false *)
+val filename: local:bool -> ?find:bool -> string -> string
+
+  (** only works for local resources
+   * if both compressed and non-compressed versions of a resource exist, both of
+   * them are removed *)
+val remove: string -> unit
+
+val exists: local:bool -> string -> bool
+val resolve: 
+  local:bool -> ?must_exists:bool -> writable:bool -> string -> string
+
+(* val get_attrs: string -> Http_getter_types.prefix_attr list *)
+val is_read_only: string -> bool
+val is_legacy: string -> bool
+val is_empty: local:bool -> string -> bool
+
+val clean_cache: unit -> unit
+
+val activate_system_mode: unit -> unit
+val list_writable_prefixes: unit -> string list