<element name=“base” xmlns=“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>