Useful RSS Tools - Information Trapping: Real-Time Research on the Web - page 341

Feed Validator
If you have to create and maintain your feed by hand, it will require a lot of time
and efort—even if you use sotware to help you. So you want to make sure RSS
readers can view the feed you're putting so much efort into generating.
Feed Validator (feedvalidator.org) lets you know whether a URL you
entered is a valid, working feed. he free service includes the text of your
RSS feed, along with highlights of real and potential problems, with exten-
sive documentation ( Figure 8 ). Feed Validator can be nitpicky—sometimes
it displays the message “his feed is valid, but may cause problems for some
users.” But it provides a great way to learn about RSS feed syntax.
Figure 8 feed Validator warns you not only about things that will break your feed, but also about things that
could potentially cause trouble.