21  value
20  status
19  severity
18  time
17  units
16  displayHigh
15  displayLow
14  alarmHigh
13  alarmLow
12  warningHigh
11  warningLow
10  controlHigh
9   controlLow
8   bitMask
7   file
6   class
5   device
4   message
3   verb
2   attribute
1   collection
