Interesting. After looking at the MXHR more, it appears as though it was adapted from Digg.com[1] (aka DUI.Stream[2]), and then later adapted by Facebook[3].
Yours sounds more elegant in that it can handle JSON naturally, but I wonder if the other might be better suited for binary content (not sure in which context that would make sense, if any).
Either way, I find them all fascinating, and I've starred your project :) Will keep an eye on it.
I suppose you could make a binary equivalent if you needed to. You'd need to make some kind of binary matching language, maybe like Erlang's binary matching.
Adding XML/XPATH support would be a natural extension.
Yours sounds more elegant in that it can handle JSON naturally, but I wonder if the other might be better suited for binary content (not sure in which context that would make sense, if any).
Either way, I find them all fascinating, and I've starred your project :) Will keep an eye on it.
1. http://techfoolery.com/mxhr/mxhr.js
2. https://github.com/digg/stream
3. https://www.facebook.com/note.php?note_id=183263890703