RSS feed options

[Marc]

Is there somewhere where the RSS Feed URL parameter options are discussed on NING?

This is a typical NING feed URL:

mysite.ning.com/leaderboards/topcontent/week?feed=yes&xn_auth=no&n=5&images=yes&imageMaxSize=60

 

I'd like to know what all of the options are for constructing such a URL. For example, imageMaxSize appears to restrict the width or height maximum. Would there be a param to crop a square image?

 

Any documentation? I've looked around a bit.