The spec Part 4 defines:
Monitored Nodes can be removed from the AddressSpace after the creation of a MonitoredItem.
This does not affect the validity of the MonitoredItem but a Bad_NodeIdUnknown shall be returned
in the Publish response. It is possible that the MonitoredItem becomes valid again if the Node is
added again to the AddressSpace and the MonitoredItem still exists.
It is permitted to create monitored item with returning Bad_NodeIdUnknown or during creation this node must exist?
For example the IO-Link specification hide the Device node and its child nodes. After configure the IO-Link port suitable the Device node and the child node are visible and the monitored items will be served.
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