public boolean isPosixMode() {
        return posixMode;
    }
Return true if the LDAP server is operating in Posix mode. By default
false is returned. When in Posix mode, users are stored within a group
by their username alone. When not enabled, users are stored in a group using
their entire DN.

@return true if posix mode is being used by the LDAP server.
xmppserver/src/main/java/org/jivesoftware/openfire/ldap/LdapManager.java