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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: class.mli,v 1.17.6.1 2004/07/16 19:31:47 herbelin Exp $ i*)
+
+(*i*)
+open Names
+open Term
+open Classops
+open Declare
+open Libnames
+open Decl_kinds
+open Nametab
+(*i*)
+
+(* Classes and coercions. *)
+
+(* [try_add_new_coercion_with_target ref s src tg] declares [ref] as a coercion
+   from [src] to [tg] *)
+val try_add_new_coercion_with_target : global_reference -> strength -> 
+  source:cl_typ -> target:cl_typ ->  unit
+
+(* [try_add_new_coercion ref s] declares [ref], assumed to be of type
+   [(x1:T1)...(xn:Tn)src->tg], as a coercion from [src] to [tg] *)
+val try_add_new_coercion : global_reference -> strength -> unit
+
+(* [try_add_new_coercion_subclass cst s] expects that [cst] denotes a
+   transparent constant which unfolds to some class [tg]; it declares
+   an identity coercion from [cst] to [tg], named something like
+   ["Id_cst_tg"] *)
+val try_add_new_coercion_subclass : cl_typ -> strength -> unit
+
+(* [try_add_new_coercion_with_source ref s src] declares [ref] as a coercion
+   from [src] to [tg] where the target is inferred from the type of [ref] *)
+val try_add_new_coercion_with_source : global_reference -> strength ->
+  source:cl_typ -> unit
+
+(* [try_add_new_identity_coercion id s src tg] enriches the
+   environment with a new definition of name [id] declared as an
+   identity coercion from [src] to [tg] *)
+val try_add_new_identity_coercion : identifier -> strength ->
+  source:cl_typ -> target:cl_typ -> unit
+
+val add_coercion_hook : Tacexpr.declaration_hook
+
+val add_subclass_hook : Tacexpr.declaration_hook
+
+(* [try_add_new_class ref] declares [ref] as a new class; usually,
+   this is done implicitely by [try_add_new_coercion]'s functions *)
+val try_add_new_class : global_reference -> strength -> unit
+
+(*s This is used for the discharge *)
+type coercion_entry
+
+val add_new_coercion : coercion_entry -> unit
+
+val process_class :
+  dir_path -> identifier list -> 
+    (cl_typ * cl_info_typ) -> (cl_typ * cl_info_typ)
+val process_coercion :
+  dir_path -> identifier list -> coercion -> coercion_entry
+
+val class_of_ref : global_reference -> cl_typ