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