<ingredients>
 <crusts choice="single">
  <crust pid="c1">Thick</crust>
  <crust pid="c2">Thin</crust>
 </crusts>
 <sauces choice="single">
  <sauce pid="s1">Marinara</sauce>
  <sauce pid="s2">Pesto</sauce>
  <sauce pid="s3">Spaghettios</sauce>
  <sauce pid="s4">Brine</sauce>
 </sauces>
 <toppings choice="multiple">
  <topping pid="t1">Onions</topping>
  <topping pid="t2">Peppers</topping>
  <topping pid="t3">Ground Beef</topping>
  <topping pid="t4">Sausage</topping>
 </toppings>
</ingredients>
