Some versions of RSS are quite incompatible, so we MUST say what version we are implementing. RSS 1.0 is completely different from the 0.9 series and 2.0.Atom doesn't have a version number, but RFC 4287 Atom is informally called 1.0.
The rss_example is supposed to be RSS 2.0.The atom_example validated on feedvalidator.org as Atom 1.0, I assume that's the RFC 4287.
