</field>
        <field>
          <name>message</name>
          <version>4.0.0+</version>
          <description>An additional message to show the user about the move, such as the reason.</description>
          <type>String</type>
        </field>
      </fields>
    </class>
    <class>
      <name>Extension</name>
      <version>4.0.0+</version>