The DeviceClass Property indicates in which domain or for what purpose a certain Device is used. The Property is optional in OPC UA DI. Here it is overridden and made mandatory. The value is specified in the specific Companion Specification (e.g. "Injection Moulding Machine" for OPC 40077).
The DeviceManual Property allows specifying an address of the user manual for the Device. It may be a pathname in the file system or a URL (Web address). If the manual is not directly accessible, it may also be a general web address (e.g. “netstal.com”).
The SoftwareRevision Property represents the software version used in the control unit (e.g. "nb2001v11B030").
The SerialNumber Property represents the serial number of the machine (unique ID given by the manufacturer, e.g. "1240114"). The Property is optional in OPC UA DI. Here it is overridden and made mandatory.