We wish to make it possible for outside resources to query tag data. For a concrete example, it would be nice for a page in the Rossetti Archive to expose that "this object was tagged as 'foo' within NINES." One approach would be to build a web service that accepted a URI (unique id) or URL (public resource) as an input and would return a list of all valid tags within NINES.
This feature would be useful as we proceed to build a "tag suggest" interface.
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Erik clarified that this feature doesn't fold into the tag suggest so the priority is demoted.