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diff --git a/helm/ocaml/mathql_interpreter/pattern.ml b/helm/ocaml/mathql_interpreter/pattern.ml
deleted file mode 100644
index 7aa09f172..000000000
--- a/helm/ocaml/mathql_interpreter/pattern.ml
+++ /dev/null
@@ -1,47 +0,0 @@
-(* 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/.
- *)
-
-(*
- * implementazione del comando PATTERN
- *)
-
-open Dbconn;;
-open Utility;;
-open Eval;;
-open Mathql_semantics;;
-
-let pattern_ex (apreamble, apattern, afragid) =
- let c = pgc () in
-  (*let r1 = helm_class_id "MathResource" in*)
-   (*let qq = "select att0 from t" ^ r1 ^ " where att0 " ^ (pattern_match apreamble apattern afragid) ^ " order by t" ^ r1 ^ ".att0 asc" in*)
-   let qq = "select uri from registry where uri " ^ (pattern_match (apreamble, apattern, afragid)) ^ " order by registry.uri asc" in
-   (*let _ = print_endline qq in*)
-    let res =
-     c#exec (qq)
-    in
-     List.map
-      (function uri -> {uri = uri ; attributes = []})
-      (pgresult_to_string_list res)
-;;