RFC 2251, Section 4.1 declares that the RDN of an entry must be included in
that entry's attribute set. Many LDAP server's do not enforce that requirement
so many LDAP applications omit the RDN from attribute sets.

To ensure interoperability and as a convenience to the JNDI application writer
the LDAP provider should check if an entry's RDN is present in its attribute
set and add it if not.