It's similar to object query dashboard element: NXSL script is executed for every node in the system and if script return true - iti will be included in the list.
Some examples:
1:
haveAlarms = { return $node->alarms->size > 0; }
type == NODE and haveAlarms
2:
type == NODE and name match "^EPE.*"
3:
true
Last will return all objects
Some examples:
1:
haveAlarms = { return $node->alarms->size > 0; }
type == NODE and haveAlarms
2:
type == NODE and name match "^EPE.*"
3:
true
Last will return all objects