[slpsys]

Right, that was my point (which was written from my phone, so it was terse). RSS is just XML, but to my knowledge, no one's _delivering_ RSS over anything but HTTP in a generic way. Indeed, it's a syndication system _for_ the Web. I will admit, I didn't read the entire article (again, on my phone), but as another commenter pointed out, most of the examples were either pretty-printed data over HTTP, or were services that have never existed in the sphere of the Web.