--- /dev/null
+(*
+ * Copyright (C) 2003:
+ * Stefano Zacchiroli <zack@cs.unibo.it>
+ * for the HELM Team http://helm.cs.unibo.it/
+ *
+ * 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/
+ *)
+
+open Hbugs_types;;
+
+exception Parse_error of string * string (* parsing subject, reason *)
+exception Unexpected_message of message;;
+
+val msg_of_string: string -> message
+val string_of_msg: message -> string
+
+val submit_req: url:string -> message -> message
+ (** close outchan afterwards *)
+val respond_msg: message -> out_channel -> unit
+ (** close outchan afterwards *)
+ (* exception_name, exception_value, output_channel *)
+val respond_exc: string -> string -> out_channel -> unit
+
+(* TODO the below functions are for debugging only and shouldn't be exposed *)
+val parse_state:
+ ('a Pxp_document.node Pxp_document.extension as 'a) Pxp_document.node ->
+ (string * string * int)
+val pp_state: (string * string * int) option -> string
+