Novell Null Driver vs Loopback Driver

FYI a loopback driver can perform a query operation. A null driver returns nothing to a query operation.

Also they are different drivers as they use different Java classes:

com.novell.nds.dirxml.driver.nulldriver.NullDriverShim

vs

com.novell.nds.dirxml.driver.loopback.LoopbackDriverShim