Referrals are implemented as entries with LDAP URL
ref attribute values that point elsewhere. The
ref attribute type is required by the
referral object class. The referral
object class is structural, however, and therefore cannot by default be added
to an entry that already has a structural object class defined. When adding
a ref attribute type to an existing entry, you can use
the extensibleObject auxiliary object class.
When a referral is set, OpenDJ returns the referral to client applications requesting the entry or child entries affected. Client applications must be capable of following the referral returned. When the directory server responds for example to your search with referrals to one or more LDAP URLs, your client then constructs new searches from the LDAP URLs returned, and tries again.
