1<addressBook> 2<card name="John Smith" email="js@example.com"/> 3<card email="js@example.com" name="John Smith"/> 4<card email="js@example.com"><name>John Smith</name></card> 5<card name="John Smith"><email>js@example.com</email></card> 6<card><name>John Smith</name><email>js@example.com</email></card> 7</addressBook> 8