datalog.top_down
Default.Const
datalog
datalog.caml_interface
datalog.unix
type t = const
val equal : t -> t -> bool
val hash : t -> int
val to_string : t -> string
val of_string : string -> t
val query : t
Special symbol, that will never occur in any user-defined clause or term. For strings, this may be the empty string "".