Scanner device type - manufacturer independent automatic
document feeding scanner. An 'xcmHrDeviceScannerADF' device
with 'xcmHrDevInfoRealization' of 'physical' is a 'real' input
device (eg, a 'scan channel' on a multifunction printer).
An 'xcmHrDeviceScannerADF' device with
'xcmHrDevInfoRealization' of 'logical' is a 'virtual' input
device (eg, a 'personality' of a 'scan channel' on a
multifunction printer).