val read : string -> string -> ( in_channel -> 'a ) -> string -> 'a
read dir suffix reader key reads information using
reader. Data are supposed to reside in the files under
dir directory with suffix
in_channel as an argument and read data from in_channel. The
key specifies key associated the value. Any characters can be used in
key, since they are properly escaped. If there are no data associated to
key, raise Not_found.
val write : string -> string -> ( out_channel -> 'a -> unit ) -> string -> 'a -> unit
writer dir suffix writer key data write
data associated the
key into the directory
suffix. You can use any characters in
key since they are propery escaped.