1<grammar>
2
3  <start>
4    <element name="addressBook">
5      <zeroOrMore>
6	<element name="card">
7	  <ref name="card.attlist"/>
8	</element>
9      </zeroOrMore>
10    </element>
11  </start>
12
13  <define name="card.attlist">
14    <group>
15      <attribute name="name">
16	<text/>
17      </attribute>
18      <attribute name="email">
19	<text/>
20      </attribute>
21    </group>
22  </define>
23
24</grammar>
25