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yap-6.3/Logtalk/examples/inheritance/predicates.lgt

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:- category(predicates).
:- public(public/0).
:- mode(public, one).
:- protected(protected/0).
:- mode(protected, one).
:- private(private/0).
:- mode(private, one).
public :-
write('Public predicate declared and defined in category predicates.'), nl.
protected :-
write('Protected predicate declared and defined in category predicates.'), nl.
private :-
write('Private predicate declared and defined in category predicates.'), nl.
:- end_category.