1<grammar xmlns="http://relaxng.org/ns/structure/1.0">
2
3  <include href="addressBook.rng">
4
5    <define name="cardContent">
6      <element name="name">
7	<text/>
8      </element>
9      <element name="emailAddress">
10	<text/>
11      </element>
12    </define>
13
14  </include>
15
16</grammar>
17