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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
open Xml_datatype
type t
val equal : t -> t -> bool
val compare : t -> t -> int
module Set : Set.S with type elt = t
val initial : t
val dummy : t
val fresh : unit -> t
val to_string : t -> string
val of_int : int -> t
val to_int : t -> int
val newer_than : t -> t -> bool
(* XML marshalling *)
val to_xml : t -> xml
val of_xml : xml -> t
(* Attaches to an exception the concerned state id, plus an optional
* state id that is a valid state id before the error.
* Backtracking to the valid id is safe.
* The initial_state_id is assumed to be safe. *)
val add : exn -> ?valid:t -> t -> exn
val get : exn -> (t * t) option
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