RDF Site Summary (RSS) 1.0 – Official Specification

RSS 0.90 – May 2001

RSS 0.91 – July 1999

RSS 0.92 – Mon, Dec 25, 2000 – Dave Winer

RSS 0.93 Fri, Apr 20, 2001 – Dave Winer

RSS 2.0 – Mon, Aug 19, 2002 – Dave Winer

RSS Version Comparison