You have seen how to use HydraExpress when working with an XML Schema that used namespace qualification and qualified locals. Fortunately, HydraExpress takes care of all the details. You don’t even need to know that the document is namespace-qualified. You also saw how to work with XML Schema elements that may occur more than once. HydraExpress automatically maps items with multiple occurrences to a vector implementation, providing the user with the normal benefits of a traditional and familiar collection abstraction.