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>
25