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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        *)
+(************************************************************************)
+
+(*i $Id: safe_typing.mli,v 1.33.2.1 2004/07/16 19:30:26 herbelin Exp $ i*)
+
+(*i*)
+open Names
+open Term
+open Declarations
+open Entries
+(*i*)
+
+(*s Safe environments. Since we are now able to type terms, we can
+  define an abstract type of safe environments, where objects are
+  typed before being added.
+
+  We also add [open_structure] and [close_section], [close_module] to
+  provide functionnality for sections and interactive modules 
+*)
+
+type safe_environment
+
+val env_of_safe_env : safe_environment -> Environ.env
+
+val empty_environment : safe_environment
+
+(* Adding and removing local declarations (Local or Variables) *)
+val push_named_assum :
+  identifier * types -> safe_environment ->
+    Univ.constraints * safe_environment
+val push_named_def :
+  identifier * constr * types option -> safe_environment ->
+    Univ.constraints * safe_environment
+
+(* Adding global axioms or definitions *)
+type global_declaration = 
+  | ConstantEntry of constant_entry
+  | GlobalRecipe of Cooking.recipe
+
+val add_constant : 
+  dir_path -> label -> global_declaration -> safe_environment -> 
+      kernel_name * safe_environment
+
+(* Adding an inductive type *)
+val add_mind : 
+  dir_path -> label -> mutual_inductive_entry -> safe_environment ->
+    mutual_inductive * safe_environment
+
+(* Adding a module *)
+val add_module :
+  label -> module_entry -> safe_environment 
+    -> module_path * safe_environment
+
+(* Adding a module type *)
+val add_modtype :
+  label -> module_type_entry -> safe_environment 
+    -> kernel_name * safe_environment
+
+(* Adding universe constraints *)
+val add_constraints : 
+  Univ.constraints -> safe_environment -> safe_environment
+
+(* Settin the strongly constructive or classical logical engagement *)
+val set_engagement : Environ.engagement -> safe_environment -> safe_environment
+
+
+(*s Interactive module functions *)
+val start_module : 
+  label -> (mod_bound_id * module_type_entry) list 
+    -> module_type_entry option 
+      -> safe_environment -> module_path * safe_environment
+
+val end_module :
+  label -> safe_environment -> module_path * safe_environment 
+
+
+val start_modtype :
+  label -> (mod_bound_id * module_type_entry) list
+    -> safe_environment -> module_path * safe_environment
+
+val end_modtype :
+  label -> safe_environment -> kernel_name * safe_environment
+
+
+val current_modpath : safe_environment -> module_path
+val current_msid : safe_environment -> mod_self_id
+
+
+(* Loading and saving compilation units *)
+
+(* exporting and importing modules *)
+type compiled_library
+
+val start_library : dir_path -> safe_environment 
+      -> module_path * safe_environment
+
+val export : safe_environment -> dir_path  
+      -> mod_self_id * compiled_library
+
+val import : compiled_library -> Digest.t -> safe_environment 
+      -> module_path * safe_environment
+
+(* Remove the body of opaque constants *)
+
+val lighten_library : compiled_library -> compiled_library
+
+(*s Typing judgments *)
+
+type judgment
+
+val j_val : judgment -> constr
+val j_type : judgment -> constr
+
+(* Safe typing of a term returning a typing judgment and universe
+   constraints to be added to the environment for the judgment to
+   hold. It is guaranteed that the constraints are satisfiable
+ *)
+val safe_infer : safe_environment -> constr -> judgment * Univ.constraints
+
+val typing : safe_environment -> constr -> judgment
+
+