How do I get RSS updates for just one page?

It's probably most correct to include both the key parameter AND the page parameter for the individual page feed, like so:

http://barcamp.org/rss2.php?a=f2bfb88...

Sometimes it takes a day for things to get updated, and there may be some special considerations for barcamp since it is such a large wiki. I AM somewhat surprised that it has yet to be updated, however.

I at first thought that the issue was just time, but there's something wrong with that page specifically, because all other pages I have checked work fine:

http://barcamp.org/rss2.php?a=f2bfb88...

That is a link to the rss for just BarCampHyderabad5 and it works perfectly, so I am puzzled also.

Any restrictions on BarCampAlsace5? Is it hidden or locked or something?

I'm looking into this now, but I'm not personally too familiar with RSS, so I'm learning as I go! I'll try to help you once I figure out how it all works. In the links you and Vu posted though, I noticed they have the number 2 after /rss - (barcamp.org/rss2.php?...)

In the link I posted, there was no 2 after /rss - could that have anything to do with it?

Alright, so, after talking with Nathan, the CTO here at PBwiki, he's explained to me that the problem is a bug in the feed generator - it's a side effect of the size and vibrancy of the barcamp wiki. The barcamp wiki has so many thousands of changes that when trying to access them, you access a cache of those changes, which refreshes when a certain number (think a large number) of more changes have happened. If changes to the BarCampAlsace5 wiki page happen to be at the top of that list when it refreshes, it will post those few (say a hundred or thousand) changes to the RSS feed. But your changes aren't always going to occur when the cache refreshes, so for the most part you won't be notified when there are changes. This is a known issue, but because fixing it could (with high probability) slow things down across the PBwiki service, it's something we aren't willing to rush into without figuring out how to do it right.

A suggestion I would make is to (perhaps at the next Alsace barcamp!) move your page's information to a new wiki (barcampalsace.pbwiki.com is available now, I just checked it!) and redirect traffic there. That would mean there would be far less edits to that wiki, meaning a RSS feed of the changes would post at every change, and you wouldn't lose any.