Web 2.0 framework developed in PHP5 that allows you to develop interoperable, standards-compliant, scalable web applications without having to worry about the complexities of the underlying architecture for the most common of functionality.
This framework written in object oriented PHP4 can create RSS 2.0 feeds. Because the transformation from objects to RSS feed happens via XSLT, you can just as well transform the objects into whatever you want, if you have your own transformation file.