code: def setDragQuery(self, query):
          
          if query is not None:
              self.setDragData('application/x-orb-query', query.toXmlString())
          else:
              self.setDragData('application/x-orb-query', None)
docs: Sets the query that should be used when this record is dragged.  This
          value will be set into the application/x-query format for mime
          data.
          
          :param      query | <orb.Query> || None