<billing.information person.href='person.1.xml'> <credit.card id='c1' type='visa' number='1234123412341234' expires.on='20000601'> <name>Jane Smith</name> <us.address object.id='object:account2:0007'> <street>10 Saturn Terrace</street> <city>New York</city> <state>NY</state> <zip main='10001' sub='1000'/> </us.address> </credit.card> </billing.information>