Java EE (Java Enterprise Edition) General Discussion

I am somewhat new to XML processing and was assigned a task to compare two xml files based on Key values. Key fields is defined in the schema file using <xs:key /> element. I have done some reading on DOM but was not able to find how I can retrieve the Key element from a Node. It'll be great help if somebody can give me a clue on how to find the key element.

Thanx in advance .

Susan