Some small CS/docs issues, however nothing that cannot be fixed in cvs:
About Matthew's comment, I'm not sure we still have to prefix private/protected with underscores.
One thing to solve prior to commit in the location of the files.
I do not think you need exceptions for this package, also why having an empty extended exception? If a method can throw an exceptions, it should be documented (throw tag).
Another typo: RespnseFormat