RSS stands for Really Simple Syndication or Rich Site Summary or RDF Site Summary depending on who you listen to. It’s also confused with RDF (Resource Description Framework), XML (eXtensible Markup Language) and a variety of other related TLA’s (Three-Letter Acronyms). RSS is actually a family of web syndication protocols which provide information in XML files known as RSS feeds.
The issue is further confused by some “helpful” RSS feed readers, search engines and directories, which claim that RSS feeds always end with the .rss or .xml extension. NOT! In fact, RSS feeds can have almost any file extension or none at all. The current version of WordPress, a popular and free (free for commercial uses too!) blog software package which I use, uses the .php extension for all of the feeds it generates. I suspect that many other blog packages written in PHP (Hypertext Preprocessor) code also use that extension for their feeds. Feedburner, a great feed re-publishing service, doesn’t use an extension at all, unless you tell it to use a particular one.
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