en RSS Wizard Online Tutorials http://210.13.82.195:9000/rss/rss.html This is an example of generating a feed which has an optional element in item .guid stands for globally unique identifier. It's a string that uniquely identifies the item. When present, an aggregator may choose to use this string to determine if an item is new. http://210.13.82.195:9000/rss/item/guid.html http://210.13.82.195:9000/rss/item/guid.html