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diff --git a/helm/ocaml/mathql_interpreter/diff.ml b/helm/ocaml/mathql_interpreter/diff.ml
deleted file mode 100644
index 5cba32345..000000000
--- a/helm/ocaml/mathql_interpreter/diff.ml
+++ /dev/null
@@ -1,98 +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/.
- *)
-
-(*
- * vecchia implementazione del comando DIFF
- 
-
-exception NotCompatible;;
-
-(* intersect_attributes is successful iff there is no attribute with *)
-(* two different values in the two lists. The returned list is the   *)
-(* union of the two lists.                                           *)
-let rec intersect_attributes (attr1, attr2) =
- match attr1, attr2 with
-    [],_ -> attr2
-  | _,[] -> attr1
-  | (key1,value1)::tl1, (key2,_)::_ when key1 < key2 ->
-      (key1,value1)::(intersect_attributes (tl1,attr2))
-  | (key1,_)::_, (key2,value2)::tl2 when key2 < key1 ->
-      (key2,value2)::(intersect_attributes (attr1,tl2))
-  | entry1::tl1, entry2::tl2 when entry1 = entry2 ->
-     entry1::(intersect_attributes (tl1,tl2))
-  | _, _ -> raise NotCompatible  (* same keys, different values *)
-;;
-
- 
-let rec diff_ex l1 l2 =
- let module S = Mathql_semantics in
-  match (l1, l2) with
-     [],_ -> []
-   | l,[] -> l
-   | {S.uri = uri1}::_, {S.uri = uri2}::tl2 when uri2 < uri1 ->
-      (diff_ex l1 tl2)
-   | {S.uri = uri1 ; S.attributes = attributes1}::tl1,
-     {S.uri = uri2}::_ when uri1 < uri2 ->
-      {S.uri = uri1 ; S.attributes = attributes1 ; S.extra = ""}::(diff_ex tl1 l2)
-   | {S.uri = uri1 ; S.attributes = attributes1}::tl1,
-     {S.uri = uri2 ; S.attributes = attributes2}::tl2 ->
-       try
-        let attributes' = intersect_attributes (attributes1, attributes2) in 
-         diff_ex tl1 tl2
-       with
-        NotCompatible ->
-         {S.uri = uri1 ; S.attributes = attributes1 ; S.extra = ""}::(diff_ex tl1 tl2)
-;;
-*)
-
-(*
- * implementazione del comando DIFF
- *)
-let rec diff_ex rs1 rs2 =
-  match (rs1, rs2) with
-     [],_ -> []
-   | l,[] -> l
-   | (uri1,l)::tl1,(uri2,_)::_ when uri1 < uri2 -> (uri1,l)::(diff_ex tl1 rs2)
-   | (uri1,_)::_,(uri2,_)::tl2 when uri2 < uri1 -> (diff_ex rs1 tl2)
-   | (uri1,_)::tl1, (uri2,_)::tl2 -> (diff_ex tl1 tl2)
-;;
-
-
-
-(*
-let diff_ex l1 l2 =
- let before = Sys.time () in
- let res = diff_ex l1 l2 in
- let after = Sys.time () in
-  let ll1 = string_of_int (List.length l1) in
-  let ll2 = string_of_int (List.length l2) in
-  let diff = string_of_float (after -. before) in
-  print_endline
-   ("DIFF(" ^ ll1 ^ ", " ^ ll2 ^ ") = " ^ string_of_int (List.length res) ^
-    ": " ^ diff ^ "s") ;
-  flush stdout ;
-  res
-;;
-*)