Specifies whether the compiler is prevented from generating an extent for this class (in the case where it would otherwise do so).
To prevent the compiler from generating an extent for this class (in cases where it would otherwise do so), use the following syntax:
Class MyApp.MyClass [ NoExtent ]
Otherwise, omit this keyword or place the word Not
immediately before the keyword.
If this keyword is true, the class has no extent. You cannot create instances of such a class. Frequently, such classes extend or override the standard persistent interface inherited from %Library.Persistent
This keyword is not inherited.
If you omit this keyword, the class can
have an extent.