XMLUtil is not a class from the standard
Java API. Are you using a library which contains that class, and if so, which library is it? Also, we don't know what the rest of the class looks like from which you are calling this, so we don't know what the methods getVariableSet() and setClaim() mean. Without this information it's impossible to help you with this question.
If I'd had to guess, I'd think that XMLUtil.createDocument() creates an XML document object from the bytes that you pass to it, but probably you've guessed that yourself from the name of the method...
[ December 19, 2007: Message edited by: Jesper Young ]