What is the XML rule for Add operation-data element to password subscribe operations?

<rule>    <description>Add operation-data element to password subscribe operations</description>    <conditions>        <and>            <if-operation op="equal">add</if-operation>            <if-password op="available"/>            <if-xpath op="not-true">operation-data</if-xpath>          </and>        <and>            <if-operation op="equal">modify-password</if-operation>            <if-xpath op="not-true">operation-data</if-xpath>          </and>      </conditions>    <actions>        <!-- Add a operation data payload element to pick up result of a password operation -->        <do-append-xml-element expression="." name="operation-data"/>      </actions>  </rule>