i recently went though schema.org a bit while putting together a blog, and it was a long list (for a human to digest), but relative to all the objects in the world, tiny. google's vested interest and stamp on it was pretty evident.
i also went through microformats, which seems to be much smaller, and more tightly-focused around blogs and structuring data shared among federated sites.
i also went through microformats, which seems to be much smaller, and more tightly-focused around blogs and structuring data shared among federated sites.