<billing.information person.href='person.1.xml'> 
  <credit.card id='c1' type='visa' number='5678567856785678' expires.on='20030130'> 
    <name>Clark Clemens</name> 
    <us.address object.id='object:account5:0012'> 
      <street>10 Mercury Terrace</street> 
      <city>Miami</city> 
      <state>FL</state>
      <zip main='33010' sub='3000'/> 
    </us.address> 
  </credit.card> 
</billing.information>