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@tchambers I am not sure I follow what you are trying to do here.
Our idea is much simpler: when you post a Note that include URLs, the authoring server (ie, the one creating the note) will try to determine if those URLs point to AP objects. If that's the case, it will tag them, either using Object Links (FEP-e232, but we have some concerns about it) or another mecanism. The receiving server will then know this URL points to an AP object, and can have it opened in-app.