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+(************************************************************************)
+(* v * The Coq Proof Assistant / The Coq Development Team *)
+(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
+(* \VV/ **************************************************************)
+(* // * This file is distributed under the terms of the *)
+(* * GNU Lesser General Public License Version 2.1 *)
+(************************************************************************)
+
+(* Certification of Imperative Programs / Jean-Christophe Filliātre *)
+
+(* $Id: peffect.mli,v 1.1.16.1 2004/07/16 19:30:01 herbelin Exp $ *)
+
+open Names
+
+(* The abstract type of effects *)
+
+type t
+
+val bottom : t
+val add_read : identifier -> t -> t
+val add_write : identifier -> t -> t
+
+val get_reads : t -> identifier list
+val get_writes : t -> identifier list
+val get_repr : t -> (identifier list) * (identifier list)
+
+val is_read : t -> identifier -> bool (* read-only *)
+val is_write : t -> identifier -> bool (* read-write *)
+
+val compose : t -> t -> t
+
+val union : t -> t -> t
+val disj : t -> t -> t
+
+val remove : t -> identifier -> t
+
+val subst : (identifier * identifier) list -> t -> t
+
+
+val pp : t -> Pp.std_ppcmds
+val ppr : t -> unit
+