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type cfg_op =
    | CfgSet of string list * string option * Config_tree.value_behaviour
    | CfgDelete of string list * string option

type world = {
    mutable running_config: Config_tree.t;
    reference_tree: Reference_tree.t;
    vyconf_config: Vyconf_config.t;
    dirs: Directories.t
}

type session_data = {
    proposed_config : Config_tree.t;
    modified: bool;
    changeset: cfg_op list
}

exception Session_error of string

val make : world -> session_data

val set : world -> session_data -> string list -> session_data

val delete : world -> session_data -> string list -> session_data

val get_value : world -> session_data -> string list -> string

val get_values : world -> session_data -> string list -> string list

val exists : world -> session_data -> string list -> bool

val string_of_op : cfg_op -> string