1<addressBook> 2<card name="John Smith" email="[email protected]"/> 3<card email="[email protected]" name="John Smith"/> 4<card email="[email protected]"><name>John Smith</name></card> 5<card name="John Smith"><email>[email protected]</email></card> 6<card><name>John Smith</name><email>[email protected]</email></card> 7</addressBook> 8