1<element name="ab:addressBook" xmlns:ab="http://www.example.com/addressBook" 2 xmlns:a="http://www.example.com/address" 3 xmlns="http://relaxng.org/ns/structure/1.0"> 4 <zeroOrMore> 5 <element name="ab:card"> 6 <element name="a:name"> 7 <text/> 8 </element> 9 <element name="a:email"> 10 <text/> 11 </element> 12 </element> 13 </zeroOrMore> 14</element> 15