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