1  <element name="addressBook"  xmlns="http://relaxng.org/ns/structure/1.0">
 2    <zeroOrMore>
 3      <element name="card">
 4        <interleave>
 5          <zeroOrMore>
 6  	  <element name="name">
 7  	    <text/>
 8  	  </element>
 9  	  <element name="email">
10  	    <text/>
11  	  </element>
12          </zeroOrMore>
13          <zeroOrMore>
14  	  <element name="company">
15  	    <text/>
16  	  </element>
17  	  <element name="email">
18  	    <text/>
19  	  </element>
20          </zeroOrMore>
21        </interleave>
22      </element>
23    </zeroOrMore>
24  </element>