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diff --git a/helm/ocaml/mathql_interpreter/mQIUtil.mli b/helm/ocaml/mathql_interpreter/mQIUtil.mli
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+++ b/helm/ocaml/mathql_interpreter/mQIUtil.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 mql_true      : MathQL.value
+
+val mql_false     : MathQL.value
+
+val set_sub       : MathQL.value -> MathQL.value -> MathQL.value
+
+val set_meet      : MathQL.value -> MathQL.value -> MathQL.value
+
+val set_eq        : MathQL.value -> MathQL.value -> MathQL.value
+
+val set_union     : 'a list -> 'a list -> 'a list
+
+val set_intersect : 'a list -> 'a list -> 'a list
+
+val mql_union     : ('a * 'b list) list -> ('a * 'b list) list -> 
+                    ('a * 'b list) list
+
+val mql_prod      : MathQL.attribute_set -> MathQL.attribute_set ->
+                    MathQL.attribute_set
+
+val mql_intersect : MathQL.result -> MathQL.result -> MathQL.result
+
+val mql_diff      : MathQL.result -> MathQL.result -> MathQL.result
+
+val iter          : ('a -> 'b list) -> 'a list -> 'b list 
+
+val mql_iter      : ('c -> ('a * 'b list) list) -> 'c list -> 
+                    ('a * 'b list) list 
+
+val mql_iter2     : ('c -> 'd -> ('a * 'b list) list) -> 'c list -> 
+                    'd list -> ('a * 'b list) list 
+
+val xor           : MathQL.value -> MathQL.value -> MathQL.value 
+
+val le            : MathQL.value -> MathQL.value -> MathQL.value 
+
+val lt            : MathQL.value -> MathQL.value -> MathQL.value 
+
+val align         : string -> string -> MathQL.value
+
+val set           : string * 'a -> (string * 'a) list -> (string * 'a) list