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(*
Copyright © 2011 MLstate

This file is part of OPA.

OPA is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License, version 3, as published by
the Free Software Foundation.

OPA is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
more details.

You should have received a copy of the GNU Affero General Public License
along with OPA. If not, see <http://www.gnu.org/licenses/>.
*)
(*
@author Louis Gesbert
**)

(** This module provides a facility for generating an XML tree that follows the
structure of an OPA database. It first extracts the schema from that
database (as saved by OPA programs thanks to dbGen), then uses it to follow
the data and to structure the XML. XML dump format is documented in the opa
stdlib.

See also Xml_import, that loads back the same XML format into a database.
*)

(** The version number of the XML format *)
val xml_dump_version : string

(** We want to be CPS but continuation-implementation agnostic, hence the
following functor on continuation type, creation and application. *)
module type SigCpsBackend = sig
  type 'a continuation
    (** the type of continuations that take ['a] (typically ['a -> unit]) *)
  val mkcont : 'b continuation -> ('a -> unit) -> 'a continuation
    (** construction of a new continuation (first arg. may be used for context information) *)
  val return : 'a -> 'a continuation -> unit
    (** application of a continuation (usually bound to the [|>] operator) *)
end

module F : functor (C: SigCpsBackend) -> sig

  (** [to_file db_read filename @> k] dumps the badop database accessible
through function [db_read] to the file named [filename]. [db_read] has the
same type as the partial application of [Badop.read] to a transaction. *)
  val to_file :
    (Badop.path -> (Badop.Dialog.query, 'rev) Badop.generic_read_op -> (Badop.Dialog.response, 'rev) Badop.generic_read_op Badop.answer Cps.t) ->
    string ->
    unit C.continuation -> unit
end
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