Hi: In draft-ietf-netmod-node-tags, we manage all the tags in the operational datastore using ietf-data-node-tags. Both system tags and user configured tags can be added or removed from operational datastore. Therefore we can use standard protocol operation to query results and retrieve node tags. These results set can be further processing locally by the client for latter usage or application.
Metadata annotation can only be applied to instance level nodes rather than schema level nodes. In IETF 114, one example of metadata annotation is to use get-data operation to retrieve Origin Metadata attributes, which described in section 3.1.1 of RFC8526 but this requires additional protocol extension to support "with-origin" parameters. I think this is feasible way to retrieve tags but at the cost of adding protocol extension. Therefore using ietf-data-node-tags to query tags seems sufficient to me. -Qin
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