<p>In the interest of keeping things as simple as possible, maybe only return this info as part of the HTML page first (e.g. <a href="https://www.openstreetmap.org/changeset/1" rel="nofollow">https://www.openstreetmap.org/changeset/1</a>). That should be just fine for the DWG use case above, unless they're really keen on API and XML fiddling. If there's some further demand for an API solution, do that in a second step only.</p>

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