Device type, including software scenes and virtual devices.
Logical device type. For example, if a physical device has 4 buttons. each button is a separate logica ldevice.
An application may have many functions.
An instance of a process based on an application function.
User type.
If a user has 2 smartphones. Each smartphone is a separate client.
The system object type. Object type is part of the system object identification. Another field is object ID.