On the way in, 'order' looks like:
<order taken-on="2004-02-23T19:22:00-08:00"> <pizza> <toppings> <kind>Ham</kind> </toppings> </pizza> </order>
While being delivered:
<order taken-on="2004-02-23T19:22:00-08:00" on-its-way='true'> <pizza> <toppings> <kind>Ham</kind> </toppings> </pizza> </order>
When delivered:
<order taken-on="2004-02-23T19:22:00-08:00" delivered-on="2004-02-23T19:15:00-08:00"> <pizza> <toppings> <kind>Ham</kind> </toppings> </pizza> </order>