I was always confused by how namespaces are supposed to work. One way to define a namespace would be to park it at a url, like at ontology.coracle.social which I think I’ve seen on some kind 1985 notes (if I remember correctly). But I don’t actually see anything there. Are there any example namespaces that I can look at?

That's the idea, but there's not requirement for publishing a definition. 1985 was simple enough that it could be inferred from the event. Reverse-domain notation isn't required either (and probably isn't a good idea). The basic idea is that anything identifiable by a string can be labeled. The namespace is just to avoid label collisions, and was probably overdoing it