What is the XML rule for Placement for Users?

<rule>    <description>Placement for Users</description>    <conditions>        <and>            <if-class-name mode="nocase" op="equal">User</if-class-name>          </and>      </conditions>    <actions>        <do-set-local-variable name="attrNS" scope="policy">            <arg-node-set>                <token-xpath expression="add-attr[@attr-name='urn:ietf:params:scim:schemas:core:2.0:User:userName']/value"/>              </arg-node-set>          </do-set-local-variable>        <do-for-each>            <arg-node-set>                <token-local-variable name="attrNS"/>              </arg-node-set>            <arg-actions>                <do-set-local-variable name="nodeVal" scope="policy">                    <arg-string>                        <token-split delimiter="@">                            <token-xpath expression="$current-node/text()"/>                          </token-split>                      </arg-string>                  </do-set-local-variable>                <do-strip-xpath expression="$current-node/text()"/>                <do-append-xml-text expression="$current-node">                    <arg-string>                        <token-xpath expression="$nodeVal"/>                      </arg-string>                  </do-append-xml-text>              </arg-actions>          </do-for-each>        <do-set-op-dest-dn>            <arg-dn>                <token-global-variable name="idv.dit.data.users"/>                <token-text xml:space="preserve">\</token-text>                <token-attr name="urn:ietf:params:scim:schemas:core:2.0:User:userName"/>              </arg-dn>          </do-set-op-dest-dn>      </actions>  </rule>