Key and Keyref not working properly

Hi All,
       I'm using key and keyref system to implement Primary and Foreign Key
relationships. I have tried everything; I'm using Apache Xerecs to validate
it. If I can implement the 'refDID' attribute in Employee to reference the
'DID' attribute in Division, I can do the rest myself. Any suggestions most
appreciated. Please have a look at the files inserted with my email. It will
not catch the deliberate errors I have introduced.  

Thanks Marco Mastrocinque