RSS 0.91 is a simple and popular metadata format for online news content, inspired by the W3C's Resource Description Framework (RDF) but not strictly conformant to it.
RSS 1.0 is a new specification developed by the RSS-Dev working grou, to bring RDF-compliance to RSS and to extend it to include arbitrary metadata, giving RSS roughly the same descriptive abilities as PRISM and NewsML.
Many Web sites, including (but not limited to) CNN, the Motley Fool, Reuters Health, Wired, SlashDot, and ZDNet, use RSS 0.91 for syndicating headlines and links to stories. There is much debate in the RSS community about whether the benefit of the extra features and extensibility in RSS 1.0 will outweigh the costs of the extra complexity over the simplistic but wildly successful RSS 0.91.
For news metadata, the major competition to the two RSS specs (aside from each-other) is NewsML, PRISM, and XMLNews-Meta. Like RSS 1.0, PRISM and XMLNews-Meta are RDF-based.
Revision 3 of the Netscape's RSS 0.91 specification.
Release candidate 1 (2000-11-03) of the RSS 1.0 specification; approved for release as RSS 1.0 (see 2000-12-09 announcement).
News and lists of tools and other resources for RSS development. This is a good place to go if you're looking for RSS software.
RSS 1.0 tutorial available online from the O'Reilly Network.
Mailing list for development of RSS 1.0.
The Resource Description Framework, an abstract data representation layer built on top of XML. RSS 1.0 is RDF-compliant, and RSS 0.91 was originally based on RDF.