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RSS feeds have their own internal structure. It is good to understand it now, because it allows you to see how your CMS can create an RSS feed in the most painless way. (Remember, if you don't have a CMS, you can still create RSS files with a simple text editor.)
At its most basic, a feed consists of a channel, with its own attributes, an image, and a number of items contained within the channel, each with their own individual attributes, like this: