[CalendarServer-users] Tying an XMLDirectoryService file to Kerberos/LDAP

Hello all, I'm curious about the XMLDirectoryService option in calendar server. Specifically, I'm interested in the "<accounts realm="Test Realm">" section of the file. Is this simply for naming purposes or does this allow one to specify an outside LDAP or Kerberos node to hand off the password duties and allow you to maintain accounts, locations and so forth in the XML file. If this is the intent, it would eliminate the need for an Open Directory server dedicated to hosting the principals and handing the passwords off to LDAP or kerberos. Thanks for any input you can provide! Ryan