private/1
private(Functor/Arity) private(Functor1/Arity1, Functor2/Arity2, ...) private([Functor1/Arity1, Functor2/Arity2, ...])Declares private predicates. A private predicate can only be called from the object containing the private directive.
private(+predicate_indicator_term)
:- private(counter/1). :- private(init/1, free/1). :- private([data/3, key/1, keys/1]).