updated issue list

* Added two issues raised by Jeni Tennison
  - expanding <not> to have multiple operands
  - how we should resolve unqualified QNames?
* Re-opened one issue raised by Jeni Tennison
  - allowing <difference> in pattern.
    (actually, it's much like <difference> for strings.)


Norm, would you update the committee's page with this update issue list?

regards,
--
Kohsuke KAWAGUCHI                          +1 650 786 0721
Sun Microsystems