1<element name="addressBook" xmlns="http://relaxng.org/ns/structure/1.0"> 2 <zeroOrMore> 3 <element name="card"> 4 <choice> 5 <element name="name"> 6 <text/> 7 </element> 8 <group> 9 <element name="givenName"> 10 <text/> 11 </element> 12 <element name="familyName"> 13 <text/> 14 </element> 15 </group> 16 </choice> 17 <element name="email"> 18 <text/> 19 </element> 20 <optional> 21 <element name="note"> 22 <text/> 23 </element> 24 </optional> 25 </element> 26 </zeroOrMore> 27</element> 28