Caché Class Definition Reference
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Specifies whether this class is final (cannot have subclasses).
To specify that a class is final, use the following syntax:
Class MyApp.Exam As %Persistent [ Final ]  { //class members }
Otherwise, omit this keyword or place the word Not immediately before the keyword.
If a class is final, it cannot have subclasses.
Also, if a class is final, the class compiler may take advantage of certain code generation optimizations (related to the fact that instances of a final class cannot be used polymorphically).
If you omit this keyword, the class definition is not final.
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