MX4JMBeanServerDelegate?

What's the reasoning behind having an MX4J-specific extension of 
MBeanServerDelegate?

It seems reasonable, though it's not clear the spec requires it, to expect 
that the following code would yield 'true':

ObjectInstance delegateoi = new 
ObjectInstance("JMImplementation:type=MBeanServerDelegate", 
"javax.management.MBeanServerDelegate");
Set s = mbs.queryMBeans(new 
ObjectName("JMImplementation:type=MBeanServerDelegate"), null);
delegateoi.equals((ObjectInstance) s.toArray()[0]);

but it doesn't in MX4J. Looking at the code it appears that the reason may 
have something to do with the MBeanServerBuilder. Anyone care to enlighten 
me?

Thanks ... WkH