[Haskell-cafe] Processing XML with HXT

Hi all, I´m just starting with HXT. My question is, how can I expose a "use case" from the main function below (the XmlPickler for UseCase has been already defined): main :: IO () main = do runX ( xunpickleDocument xpUseCase [ (a_validate,v_0) ], "uc.xml" ) return () For example, if I just want to show the use case contents, how can I call "show" for a retrived use case. Thanks in advance. Rodrigo.