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>