I have a form with the following basic data source structure:

Work Package
   Name
   Description
   (Activities) group, repeating
       Activity Name
       (Tasks) group repeating
           Task Name

I've written a web service that will populate a DB with values I intend to
pull from the form.  I'm trying to use XPathNavigator and XPathNodeIterator,
but am not getting the correct results.  Could someone provide some basic
concepts on how to navigate and iterate correctly?

Thanks,
Brian