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diff --git a/helm/ocaml/mathql_interpreter/mQueryUtil.mli b/helm/ocaml/mathql_interpreter/mQueryUtil.mli
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+(* Copyright (C) 2000, 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://cs.unibo.it/helm/.
+ *)
+
+(*  AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
+ *)
+
+val text_of_query  : (string -> unit) -> string -> MathQL.query -> unit
+
+val text_of_result : (string -> unit) -> string -> MathQL.result -> unit
+
+val query_of_text  : Lexing.lexbuf -> MathQL.query
+
+val result_of_text : Lexing.lexbuf -> MathQL.result
+
+type time
+
+val start_time : unit -> time
+
+val stop_time  : time -> string
+
+type 'a comparison = Lt 
+                   | Gt
+		   | Eq of 'a
+
+val list_join : ('a -> 'a -> 'a comparison) -> 'a list -> 'a list -> 'a list 
+
+val list_meet : ('a -> 'a -> 'a comparison) -> 'a list -> 'a list -> 'a list