Annotation attributes with type parameters

When you define a Java interface, it's possible to declare a method with type parameters, for example like this:

public interface ExampleInterface {
    <E extends Enum<E>> Class<E> options();
}

The same thing does not work in an annotation. This, for example, is illegal:

public @interface ExampleAnnotation {
    <E extends Enum<E>> Class<E> options();
}

I can get what I'm after by using the raw type Enum:

public @interface ExampleAnnotation {
    @SuppressWarnings("rawtypes")
    Class<? extends Enum> options();
}

What exactly is the reason why it is not possible to declare annotation attributes with type parameters?