how to make a "atom feed" insteadof 'kml file' to loaded by GGeoXml..(i use django)

Question

you can load geo-info via two way below:

var g = new GGeoXml("http://zjm1126.3322.org/mymedia/b.kml");
map.addOverlay(g);

or

var g = new GGeoXml("http://tagzania.com/rss/user/blogwatcher/7wonders%2Bnew/");
map.addOverlay(g);

if i want to saving the features(user made on google map,line and point) ,i have to make a kml or make a "atom feed"

the second way is using "atom feed",

my problem is how to make a "atom feed" for loading..

thanks