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@thisisaaronland @Edent tight.

Another question: since they both match the pattern something:other=third how can I tell that the first example is an URL and the second example is a machine tag?

(1) https://google.com/search?q=machine+tag
(2) dc:topic="machine tags"

I think the first is not a machine tag because of the "/" and "?" and "." characters. I think it's probably a good rule of thumb to avoid the most common URL protocols (http, https, ftp, ...) as a namespace.