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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: penv.mli,v 1.3.8.1 2004/07/16 19:30:01 herbelin Exp $ *)
+
+open Ptype
+open Past
+open Names
+open Libnames
+open Term
+
+(* Environment for imperative programs.
+ * 
+ * Here we manage the global environment, which is imperative,
+ * and we provide a functional local environment. 
+ *
+ * The most important functions, is_in_env, type_in_env and fold_all
+ * first look in the local environment then in the global one.
+ *)
+
+(* local environments *)
+
+type local_env
+
+val empty : local_env
+val add : (identifier * type_v) -> local_env -> local_env
+val add_set : identifier -> local_env -> local_env
+val is_local : local_env -> identifier -> bool
+val is_local_set : local_env -> identifier -> bool
+
+(* typed programs *)
+
+type typing_info = {
+  env : local_env;
+  kappa : constr ml_type_c
+}
+  
+type typed_program = (typing_info, constr) t
+
+(* global environment *)
+
+val add_global : identifier -> type_v -> typed_program option -> object_name
+val add_global_set : identifier -> object_name
+val is_global : identifier -> bool
+val is_global_set : identifier -> bool
+val lookup_global : identifier -> type_v
+
+val all_vars : unit -> identifier list
+val all_refs : unit -> identifier list
+
+(* a table keeps the program (for extraction) *)
+
+val find_pgm : identifier -> typed_program option
+
+(* a table keeps the initializations of mutable objects *)
+
+val initialize : identifier -> constr -> unit
+val find_init : identifier -> constr
+
+(* access in env (local then global) *)
+
+val type_in_env : local_env -> identifier -> type_v
+val is_in_env : local_env -> identifier -> bool
+
+type type_info = Set | TypeV of type_v
+val fold_all : (identifier * type_info -> 'a -> 'a) -> local_env -> 'a -> 'a
+
+(* local environnements also contains a list of recursive functions
+ * with the associated variant *)
+
+val add_recursion : identifier * (identifier*variant) -> local_env -> local_env
+val find_recursion : identifier -> local_env -> identifier * variant
+
+(* We also maintain a table of the currently edited proofs of programs
+ * in order to add them in the environnement when the user does Save *)
+
+val new_edited : identifier -> type_v * typed_program -> unit
+val is_edited : identifier -> bool
+val register : identifier -> identifier -> unit
+