MailboxSorter device type - manufacturer independent.
An 'xcmHrDeviceMailboxSorter' is a 'multi-bin' output device,
which MAY be configured as either a 'mailbox' or a 'sorter',
by a system adminstrator or by default product configuration.
An 'xcmHrDeviceMailboxSorter' with 'xcmHrDevInfoRealization' of
'physical' is a 'real' output device and associated with
associated with exactly two 'logical' output devices of types
'xcmHrDeviceMailbox' and 'xcmHrDeviceSorter' - one of these
'logical' devices MAY be 'running' (currently configured) - at
least one SHALL be 'down' (NOT currently configured).