RDFa, for example, allows much more expressive power than META tags did and lets you get very specific. It also allows you to model relationships you never coul

RDFa, for example, allows much more expressive power than META tags did and lets you get very specific. It also allows you to model relationships you never could have expressed with a META tag. Insofar as there is a lot of value in consuming good actors, there will be an incentive to filter out the bad actors.