<appendix id="advanced_topics">
  <title>Advanced Topics</title>
  <section>
     <title>Security Migration From Previous Versions</title>
     <para>
     It is recommended that customers who have utilized the internal JDBC membership 
     domain from releases prior to MetaMatrix 5.5 migrate those users and groups to 
     an LDAP compliant directory server.  
     </para>
     <para>
     Refer to the JBoss Application Server security documentation for using 
     an LDAP directory server.  If there are additional questions or the need 
     for guidance in the migration process, please contact technical support.
     </para>

     
     <para>      
     Several free and open source directory servers include:
     </para>

     <itemizedlist>
        <listitem>
           <para>
           The Fedora Directory Server - <ulink url="http://directory.fedoraproject.org/"/>
           </para>
        </listitem>
        <listitem>
           <para>
           Open LDAP - <ulink url="http://www.openldap.org/"/>
           </para>
        </listitem>
        <listitem>
           <para>
           Apache Directory Server - <ulink url="http://directory.apache.org/"/>
           </para>
        </listitem>
     </itemizedlist>
      

  </section>

</appendix>