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I think you should get a status for each elementid you read, as Randy points out.
As an implementer, the tricky part is if you read something that's complex (ex. OPC UA branch). OPC UA is going to return status codes for each node in the branch. So the implementor has to decide, do I allow a "partial" result where some underlying things failed but it's still useful to return some data, or do is it all or nothing. The same applies if the thing your are reading has a data from different sources (ex. OPC and SQL).
From the perspective of the standard, do we think the client cares? Should we have some Good/Partial status or some way for the client to be aware of this? I think probably not, and we could add it later if there is a need.
Splitting out from #3
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