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3.1. RSS 0.91

The oldest and most established RSS standard still in use, RSS 0.91 was originally released by Netscape's RSS team, led by Dan Libby, in July 1999. It was later refined and further documented by Netscape, with Userland Software's Dave Winer. It is based on a combination of Netscape's RSS 0.90 and Userland's own older ScriptingNews 2.0b1 format. Neither of those formats are used in any meaningful way today, but RSS 0.91 continues. At the time of this writing, Syndic8 — one of the largest RSS aggregators on the web — has 55% of its feeds declaring themselves as RSS 0.91. While later versions of the 0.9x standard build on this original spec in many useful ways, 0.91 is a good place for the RSS practitioner to start. Figure 3-1 shows a tree representation of RSS 0.91.

Figure 3-1. A tree representation of RSS 0.91



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