NGWS SDK Documentation  

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7.5.1 Class modifiers

There are two special modifiers on a class, MustInherit and NotInheritable. It is illegal to specify them both. The MustInherit modifier indicates that the class is abstract, while the NotInheritable modifier indicates that the class is final.

ClassModifier ::= AccessModifier | ShadowsModifier | MustInherit | NotInheritable