<element name="base"
xmlns="http://relaxng.org/ns/structure/1.0">
<choice>
<group>
<element name="data">
<value>firstValue</value>
</element>
<oneOrMore>
<element name="option">
<element name="value">
<text/>
</element>
<element name="label">
<text/>
</element>
</element>
</oneOrMore>
</group>
<group>
<element name="data">
<value>secondValue</value>
</element>
<oneOrMore>
<element name="option">
<element name="value">
<text/>
</element>
<element name="label">
<text/>
</element>
</element>
</oneOrMore>
</group>
</choice>
</element>
