code: @Override
  	public void processItemDocument(ItemDocument itemDocument) {
  		this.countItems++;
  
  		// Do some printing for demonstration/debugging.
  		// Only print at most 50 items (or it would get too slow).
  		if (this.countItems < 10) {
  			System.out.println(itemDocument);
  		} else if (this.countItems == 10) {
  			System.out.println("*** I won't print any further items.\n"
  					+ "*** We will never finish if we print all the items.\n"
  					+ "*** Maybe remove this debug output altogether.");
  		}
  	}
docs: Processes one item document. This is often the main workhorse that
  gathers the data you are interested in. You can modify this code as you
  wish.