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+(***********************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team    *)
+(* <O___,, *        INRIA-Rocquencourt  &  LRI-CNRS-Orsay              *)
+(*   \VV/  *************************************************************)
+(*    //   *      This file is distributed under the terms of the      *)
+(*         *       GNU Lesser General Public License Version 2.1       *)
+(***********************************************************************)
+
+(*** This module implements an "untyped store", in this particular case we
+        see it as an extensible record whose fields are left unspecified. ***)
+
+type t
+
+module Field : sig
+  type 'a field = {
+    set : 'a -> t -> t ;
+    get : t -> 'a option ;
+    remove : t -> t 
+  }
+  type 'a t = 'a field
+end
+
+val empty : t
+
+val field : unit -> 'a Field.field