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Null Methods
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A null method is a method which takes no action, and returns a value of
NIL. A method can be declared as NULL to suppress the behavior of
that method in a subclass.
A null method is declared (in a class declaration block) as follows:
METHOD <method name> NULL
A method declared as NULL must not be defined (using either METHOD
FUNCTION or METHOD PROCEDURE) in the class where it is declared. Any
such definition will be ignored.