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AJAX RSS Reader

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In the last few years the web became much more active than it used to be. Today we see an explosion of new sources of information, such as news sites appearing every day, and the latest trend on the web life - the weblogs (every living person seems to have a web log these days).

As a natural reaction to this invasion of information, many systems appeared that allow for grouping, filtering, and aggregating this information. This is implemented in practice through web syndication, which is that form of syndication where parts of a web site (such as news, weblog posts, articles, and so on) are made available for other sites or applications to use.

In order to be usable by other parties, the data to be shared must be in a generic format that can be laid out in different formats than in the original source, and when it comes to such formats, RSS 2.0 (Really Simple Syndication) and Atom are the most popular choices.

Learn more about the history of RSS and Atom in the Wikipedia - the link to the RSS page is http://en.wikipedia.org/wiki/RSS_(protocol).

In this chapter we'll analyze the RSS file format, then take a look at Google Reader (Google's RSS aggregator), and then build our own RSS aggregator web page with AJAX and PHP.

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