val read_map : mapping -> int -> int
val create_mapping_rw : int -> mapping_rw
val mapping_rw_to_ro : mapping_rw -> mapping
val add_mapping : mapping_rw -> int -> int -> unit
val create_rw : int -> int -> rw
val add : rw -> int -> int -> unit
val no_char_ucs : t -> int
val no_char_enc : t -> int
val enc_to_ucs : t -> int -> int
val ucs_to_enc : t -> int -> int
val of_name : string -> t