1<element name="base"
2xmlns="http://relaxng.org/ns/structure/1.0">
3  <choice>
4    <group>
5      <element name="data"> 
6        <value>firstValue</value>
7      </element>
8      <oneOrMore>
9        <element name="option">
10          <element name="value">
11            <text/>
12          </element>
13          <element name="label">
14            <text/>
15          </element>
16        </element>
17      </oneOrMore>
18    </group>
19    <group>
20      <element name="data"> 
21        <value>secondValue</value>
22      </element>
23      <oneOrMore>
24        <element name="option">
25          <element name="value">
26            <text/>
27          </element>
28          <element name="label">
29            <text/>
30          </element>
31        </element>
32      </oneOrMore>            
33    </group>
34  </choice>
35</element>
36