sig
type 'a t
val create :
name:string ->
?default:'a ->
to_string:('a -> string) ->
of_string:(string -> 'a) -> unit -> 'a Eliom_content.Html.Custom_data.t
val create_json :
name:string ->
?default:'a -> 'a Deriving_Json.t -> 'a Eliom_content.Html.Custom_data.t
val attrib :
'a Eliom_content.Html.Custom_data.t ->
'a -> [> `User_data ] Eliom_content.Html.attrib
end