title: int variable usage in Jaxb
body: <p>I've an xml element that takes in a number. It's optional. I created the JAXB POJO classes and the same tag is mapped to an int variable in Java. Now, as the xml element is optional, user may not set it at all, which would set the corresponding java variable to 0.
    In some cases the user may set it and send in 0. Again, the java variable would be set to 0.
  I was wondering whether there is a way to differentiate these two scenarios programmatically.
  Thank you</p>