FAQ

From GetSemantic

[edit] How do I choose between eRDF, RDFa, GRDDL, Microformats, and other Semantic HTML Conventions?

You don't have to choose - the RDF centric approaches (eRDF, RDFa, GRDDL) are compatible with other forms of semantic (x)html - in the same document, even on the same elements.

RDF-based approaches are most useful when you want a way to describe your information in a universally understood way, making it compatible with other RDF data and RDF tools.

Approaches based on other semantic html conventions (including microformats) are most useful when they allow the information in the html to be transformed to another immediately useful format - for example, hAtom is useful if you want an Atom feed derived from your page.