1<rng:element name="addressBook" xmlns:rng="http://relaxng.org/ns/structure/1.0"> 2 <rng:zeroOrMore> 3 <rng:element name="card"> 4 <rng:element name="name"> 5 <rng:text/> 6 </rng:element> 7 <rng:element name="email"> 8 <rng:text/> 9 </rng:element> 10 </rng:element> 11 </rng:zeroOrMore> 12</rng:element> 13