sig
val from_hooks : unit -> Logtk.Literal.Conv.hook_from list
val add_from_hook : Logtk.Literal.Conv.hook_from -> unit
val to_hooks : unit -> Logtk.Literal.Conv.hook_to list
val add_to_hook : Logtk.Literal.Conv.hook_to -> unit
val of_form : Logtk.Term.t Logtk.SLiteral.t -> Logtk.Literal.t
val to_form : Logtk.Literal.t -> Logtk.Term.t Logtk.SLiteral.t
end