The queue namespace domain (directory protocol) for the queue
path and queue name (eg, 'internetDNS', 'netwareNDS').
Usage: This queue namespace domain SHALL be a valid
directory protocol enumeration from 'XcmCommsStackExtProtocol'
in the XCMI Comms Engine TC.
Usage: When a remote management station (client) creates a row
in 'xcmSvcMonQueueTable' (via 'xcmSvcMonQueueRowStatus'),
this queue namespace domain SHALL be specified.
Note: For implementation efficiency, this object uses the
integer 'XcmCommStackExtProtocol' values (from the XCMI Comms
Engine MIB) rather than the equivalent 'XcmCO...' OID values
(from the XCMI Comms Config MIB).