*  The implementation of this is a little slow, since it creates
     *  a number of objects each time it is called.  This could be optimized
     *  to keep the same objects around, but then thread-safety issues would arise.
     *
     *  @param contextNode The node to start searching from.
     *  @param expression A valid XPath string.

  <mime-type type="application/vnd.oma.dcdc"/>
  <mime-type type="application/vnd.oma.dd2+xml">
    <glob pattern="*.dd2"/>
  </mime-type>
  <mime-type type="application/vnd.oma.drm.risd+xml"/>
  <mime-type type="application/vnd.oma.group-usage-list+xml"/>
  <mime-type type="application/vnd.oma.poc.detailed-progress-report+xml"/>
  <mime-type type="application/vnd.oma.poc.final-report+xml"/>