--- /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/
+ *)
+
+type priority = [
+ | `Emerg (* system is unusable *)
+ | `Alert (* action must be taken immediately *)
+ | `Crit (* critical conditions *)
+ | `Err (* error conditions *)
+ | `Warning (* warning conditions *)
+ | `Notice (* normal, but significant, condition *)
+ | `Info (* informational message *)
+ | `Debug (* debug-level message *)
+]
+
+ (**
+ Warning: logging is disabled by default, you have to invoke #enable method
+ before being able to log anything.
+ @param level minimum level of priority that will be reported, msg with
+ priority less than this will be ignored
+ @param outchan output channel on which output log messages *)
+class sysLogger:
+ ?level: priority -> ?outchan: out_channel ->
+ unit ->
+ object
+ method level: priority
+ method levelNo: int
+ (** enable logging, by default logging is disabled *)
+ method enable: unit
+ (** disable logging *)
+ method disable: unit
+ (** log a message *)
+ method log: priority -> string -> unit
+ end
+
+class processingLogger:
+ unit ->
+ object
+ method log: string -> unit
+ method asText: string
+ method asHtml: string
+ end
+