"seamark" uses a highly hierarchical tag scheme, but it limits that project's interoperability with the rest of OSM.
----------------------- Realistically: If camp_site:identifier is used it will be a looooong time before it's ever rendered or routable. That's just reality. addr:housenumber has the advantage of rendering and perhaps routability today. I think that future routing software can be smart enough to work without addr:street. If the router gets you as far as a campground (or other) polygon, and within that polygon are bare addr:unit or addr:housenumber, it should be able to figure out what to do.
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