What would be the advantage of those schemes over HTTP? In the case of code, I can see that there's a potential benefit to being able to refer to conceptual ob

What would be the advantage of those schemes over HTTP? In the case of code, I can see that there's a potential benefit to being able to refer to conceptual objects (e.g. variables, functions, macros) within version control systems, and maybe that's worth breaking with HTTP URLs, although I'm not completely sold there. What would the advantage of json: be over Content-Type: TYPE+json? It's a little easier to see that iot:UUID might indicate something like 'over any number of protocols, over any number of networks, please contact this device in my locality' or somesuch.