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diff --git a/helm/software/helena/src/basic_rg/brgELPI.ml b/helm/software/helena/src/basic_rg/brgELPI.ml
deleted file mode 100644
index 4e78eac13..000000000
--- a/helm/software/helena/src/basic_rg/brgELPI.ml
+++ /dev/null
@@ -1,185 +0,0 @@
-(*
-    ||M||  This file is part of HELM, an Hypertextual, Electronic        
-    ||A||  Library of Mathematics, developed at the Computer Science     
-    ||T||  Department, University of Bologna, Italy.                     
-    ||I||                                                                
-    ||T||  HELM is free software; you can redistribute it and/or         
-    ||A||  modify it under the terms of the GNU General Public License   
-    \   /  version 2 or (at your option) any later version.              
-     \ /   This software is distributed as is, NO WARRANTY.              
-      V_______________________________________________________________ *)
-
-module KF = Filename
-module KP = Printf
-
-module U  = NUri
-module C  = Cps
-module G  = Options
-module N  = Layer
-module E  = Entity
-module R  = Alpha
-module B  = Brg
-
-(* Internal functions *******************************************************)
-
-let ok = ref true
-
-let uris = ref []
-
-let base = "elpi"
-
-let ext = ".elpi"
-
-let reserved = ["pi"; "sigma"; "nil"; "delay"; "in"; "with"; "resume"; "context"]
-
-let alpha n =
-   if List.mem n reserved then !G.alpha ^ n else n
-
-let out_preamble och =
-   let ich = open_in !G.preamble in
-   let rec aux () = KP.fprintf och "%s\n" (input_line ich); aux () in
-   try aux () with End_of_file -> close_in ich
-
-let out_top_comment och msg =
-   KP.fprintf och "%% %s\n\n" msg
-
-let out_comment och msg =
-   KP.fprintf och "%% %s\n" msg 
-
-let out_clause och msg =
-   KP.fprintf och "%s\n\n" msg 
-
-let out_uri och u =
-   let str = U.string_of_uri u in
-   let rec aux i =
-     let c = str.[i] in
-     if c = '.' then () else begin 
-        output_char och (if c = '/' then '_' else c);
-        aux (succ i)
-     end
-   in
-   let rec strip i n = 
-      if n <= 0 then succ i else
-      strip (String.index_from str (succ i) '/') (pred n)
-   in
-   aux (strip 0 3)
-
-let out_name och a =
-   let f n = function 
-      | true  -> KP.fprintf och "%s" (alpha n)
-      | false -> KP.fprintf och "_"
-   in
-   let err () = f "" false in
-   E.name err f a
-
-let rec out_term st e och = function
-   | B.Sort (_, h)                   ->
-      let sort = if h = 0 then "k+set" else if h = 1 then "k+prop" else assert false in
-      KP.fprintf och "(sort %s)" sort
-   | B.LRef (_, i)                   ->
-      let _, _, a, b = B.get e i in
-      KP.fprintf och "%a" out_name a
-   | B.GRef (_, s)                   ->
-      KP.fprintf och "%a" out_uri s
-   | B.Cast (_, u, t)                ->
-      KP.fprintf och "(cast %a %a)" (out_term st e) u (out_term st e) t 
-   | B.Appl (_, x, v, t)             ->
-      let c = if x then "appx" else "appr" in
-      KP.fprintf och "(%s %a %a)" c (out_term st e) v (out_term st e) t
-   | B.Bind (a, B.Abst (r, n, w), t) ->
-      let a = R.alpha B.mem e a in
-      let ee = B.push e B.empty a (B.abst r n w) in
-      let c = if r then "prod" else "abst" in
-      let l = match N.to_string st n with
-         | "1" -> "l+1"
-         | "2" -> "l+2"
-         | _   -> ok := false; "?"
-      in
-      KP.fprintf och "(%s %s %a %a\\ %a)"
-         c l (out_term st e) w out_name a (out_term st ee) t
-   | B.Bind (a, B.Abbr v, t)         ->
-      let a = R.alpha B.mem e a in
-      let ee = B.push e B.empty a (B.abbr v) in
-      KP.fprintf och "(abbr %a %a\\ %a)"
-          (out_term st e) v out_name a (out_term st ee) t
-   | B.Bind (a, B.Void, t)   ->
-      let a = R.alpha B.mem e a in
-      let ee = B.push e B.empty a (B.Void) in
-      KP.fprintf och "(void %a\\ %a)"
-          out_name a (out_term st ee) t
-
-(* variant 1 *************************************************)
-
-let output_entity_1 och st (_, na, s, b) =
-   if na.E.n_apix <= !G.last then begin
-   match b with
-      | E.Abbr t ->
-         KP.fprintf och "(gdef+1 c+%u %a\n %a\\\n" na.E.n_apix (out_term st B.empty) t out_uri s;
-         uris := (true, s) :: !uris; !ok
-      | E.Abst u ->
-         KP.fprintf och "(gdec+1 c+%u %a\n%a\\\n" na.E.n_apix (out_term st B.empty) u out_uri s;
-         uris := (false, s) :: !uris; !ok
-      | E.Void   -> C.err ()
-   end else !ok
-
-let close_out_1 och () =
-   let aux_sep _ = KP.fprintf och "%s" ")" in
-   KP.fprintf och "%s" "gtop";   
-   List.iter aux_sep !uris;
-   out_clause och "\n\n).";
-   close_out och
-
-(* Variant 2 *************************************************)
-
-let output_entity_2 och st (_, na, s, b) =
-   if na.E.n_apix <= !G.last then begin
-   match b with
-      | E.Abbr t ->
-         KP.fprintf och "g+line %a c+%u\n       %a\n.\n\n"
-            out_uri s na.E.n_apix (out_term st B.empty) t;
-         uris := (true, s) :: !uris; !ok
-      | E.Abst u ->
-         KP.fprintf och "g+line %a c+%u\n       %a\n.\n\n"
-            out_uri s na.E.n_apix (out_term st B.empty) u;
-         uris := (false, s) :: !uris; !ok
-      | E.Void   -> C.err ()
-   end else !ok
-
-let close_out_2 och () =
-   let aux_name (b, s) =
-      let gde = if b then "gdef+2" else "gdec+2" in 
-      KP.fprintf och "(%s %a\n" gde out_uri s
-   in
-   let aux_sep _ = KP.fprintf och "%s" ")" in
-   if !G.first > 0 then begin
-      let s = KP.sprintf "tv+c C T :- $lt C c+%u, !." !G.first in
-      out_clause och s;
-      out_clause och "tv+c C T :- tv+ T."
-   end;
-   out_clause och "main :- grundlagen.";
-   out_clause och "grundlagen :- (gv+ ";
-   List.iter aux_name (List.rev !uris);
-   KP.fprintf och "%s" "gtop";
-   List.iter aux_sep !uris;
-   out_clause och "\n\n).";
-   close_out och
-
-(* Interface functions ******************************************************)
-
-let open_out_1 fname =
-   let dir = KF.concat !G.manager_dir base in 
-   let path = KF.concat dir fname in
-   let och = open_out (path ^ "1" ^ ext) in
-   out_preamble och;
-   out_top_comment och (KP.sprintf "This file was generated by %s: do not edit" G.version_string);
-   out_clause och "main :- grundlagen.";
-   out_clause och "grundlagen :- gv+ (";
-   output_entity_1 och, close_out_1 och
-
-let open_out_2 fname =
-   let dir = KF.concat !G.manager_dir base in 
-   let path = KF.concat dir fname in
-   let och = open_out (path ^ "2" ^ ext) in
-   out_preamble och;
-   out_top_comment och (KP.sprintf "This file was generated by %s: do not edit" G.version_string);
-   output_entity_2 och, close_out_2 och