--- /dev/null
+(*
+ ||M|| This file is part of HELM, an Hypertextual, Electronic
+ ||A|| Library of Mathematics, developed at the Computer Science
+ ||T|| Department, University of Bologna, Italy.
+ ||I||
+ ||T|| HELM is free software; you can redistribute it and/or
+ ||A|| modify it under the terms of the GNU General Public License
+ \ / version 2 or (at your option) any later version.
+ \ / This software is distributed as is, NO WARRANTY.
+ V_______________________________________________________________ *)
+
+type request = (string * string) list * string
+
+val open_out: string -> int -> unit
+
+val close_out: unit -> unit
+
+val loop_in: ('a -> 'a) -> (string -> string -> 'a -> 'a) -> ('a -> 'a) -> 'a -> 'a
+
+val string_of_request: string -> request -> string
+
+val control_input: string -> unit
+
+val open_out_html: string -> string -> string -> string -> string -> unit
+
+val close_out_html: unit -> unit