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