Example 8.44 	OrderAppService Class
import generated.Address;
import generated.PurchaseOrder;

import java.util.List;

public class OrderAppService {
	public OrderAppService() {
	}

	public void placeOrder(PurchaseOrder purchaseOrder) {
		Address shipTo = purchaseOrder.getShipTo();
		Address billTo = purchaseOrder.getBillTo();
		List items = purchaseOrder.getItems();

		// Update data store
	}
}