(* Gui framework elements common across individual components. *)

(* Types of this class describe gui components. *)
class gui :: Type (* The type of an object to render *)
      -> {Unit} (* The HTML context to render it for (minus [body]) *)
      -> Type

(* How to add components to the gui class. *)
val mkGui : t ::: Type -> ctx ::: {Unit} -> ([body ~ ctx] => t -> xml (body ++ ctx) [] []) -> gui t ctx

(* XML itself can be a gui component. *)
val gui_xbody : gui xbody []
val gui_xtable : gui xtable [Table]

(* Currently the only thing a gui component can do is be
 * pretty printed to a piece of xml. *)
val toXml : t ::: Type -> ctx ::: {Unit} -> [body ~ ctx] => gui t ctx -> t -> xml (body ++ ctx) [] []