I'm wondering if anyone knows the naming convention used for the actual xml file that the RSS feed from each blog uses. I'm trying to tie the feed into another site, but is not excepting the url with just the folder where the xml file resides. I've added other feeds to this other site, but the only ones that work are the ones with specific xml file names in the link. Any help would be appreciated.

Not working:
http://www.photoblog.com/rss/cgiffin

Needs to be:
http://www.photoblog.com/rss/cgiffin/SOMETHING.xml