# File jabber4r/session.rb, line 463
    def register_message_filter
      @connection.add_filter("messageFilter") do |element|
        if element.element_tag=="message" and @messageListeners.size > 0
          element.consume_element
          message = Jabber::Protocol::Message.from_element(self, element)
          notify_message_listeners(message)
        end #if message 
      end #do
    end