Implementing Annotation Question

I have a question about the purpose of one of the features of Annotations.
If I have an annotation and create a class which implements this annotation what do I get from my class?

If I create an annotation such as:

public @interface MyAnnotation { String name() default ""; }

What does it mean, or what is the purpose of:

public class MyClass implements MyAnnotation { public String name() { // What can I do here? } }

I can't find any examples of why you might want to do this or even why its valid. I'm thinking this class could be created and cast as a MyAnnotation, perhaps to replace an existing annotation or add another annotation to an Element.

Any insight would be great! Cheers guys


Tom