Another problem is the updating, adding and modifying is relatively straightforward but for deletions the index has to be regenerated from scratch. RH runs a proxy to all different directory service types. The open discussion. Another issue is that there is only one index for Sweden which could become very big. Having one index is not really a truly distributed solution.
Longer names produce less incorrect hits and hence reduces the search space.
A perceived problem is replication, there is the need for some kind of agreement for public replication. For sub tree searches put a strong hint in dSI and add OID for type of service. Character sets are important but not yet, how would one map soundex characters between multiple languages. It seems that LDAP is going to be the common protocol to use and gateways between LDAP and others will be supported. For the generation of indices LDAP can be used too, similar to the Centipede approach.