Oh, I didn't express myself clearly: I wasn't asking for you to embed streaming information in your listing (which I reckon it would be impossible), but to generate my own xmltv listing from my own vdr machine to stream live tv, again, from my own vdr machine.
Now, if there's no way to do that, I don't really see the meaning of remote epg, ok, the listing is cute and the reminder could be useful, but if it's impossible to use it to program real timers and/or to stream its usefulness is limited.