<attribute>
            <c:ref>ri:sAMAccountName</c:ref>
            <displayName>User Name</displayName>
            <limitations>
               <minOccurs>0</minOccurs>
               <access>
                  <read>true</read>
                  <add>false</add>
                  <modify>false</modify>
               </access>
            </limitations>
            <matchingRule xmlns:mr="http://prism.evolveum.com/xml/ns/public/matching-rule-3">mr:stringIgnoreCase</matchingRule>
            <inbound>
               <expression>
                  <script>
                     <code> input.toString().toLowerCase() </code>
                  </script>
               </expression>
               <target>
                  <c:path>$user/name</c:path>
               </target>
            </inbound>
         </attribute>