CCIS2630 PHP: RSS purposes/beginnings

RDF based. W3 Schools coverage of RDF
According to w3 schools, 50% of sites are on 0.91, 25% on 1.0, and 25% split between 2.0 and everything else.
Why go 2.0? Open Source, and easier than 1.0 to learn
also, for the most part, choice of format is a matter of taste.
We're going to use a library from PEAR -- the PHP Extension and Application Repository