Atompub, may not be the same as atom (from RSS).
It may have a same part of the name in it, but it does not mean that it's therefor a form of RSS.
If so, it would need a browser.
What would make sense is that it can load a specific atom feed, from a fixed address; to download perhaps books from a library on an ebook server.
Anything that has RSS can be hacked very easily to load almost the whole internet!
Eventhough the JBC can load HTMLs, they don't function fully (links don't work, flash and java don't work).