Delivering Content with RSS for Web Developers
http://developer.apple.com/internet/deliveringcontentwithrss.html

Apple Inc.
2006

Abstract:

The delivery of web content is being revolutionized by a new technique known as syndication. The most common format for syndication is RSS, or Really Simple Syndication, an XML (eXtensible Markup Language) format for coordinating the delivery of time-based content streams, or 'feeds.' This means that RSS can be used to deliver content that changes over time. RSS provides for the inclusion of additional data, similar to email attachments, using the ENCLOSURE tag.