@johnbender They're called guilds. NERD!

@steveklabnik That said, you could actually use the .geo @microformat for lat/lon markup.

@steveklabnik I disagree. Data-* is for unseen, but necessary data. Like the lat/lon value of a map pin. It's not for the names of things.

There are already several @microformats that prescribe classes to use to add semantics. And classes aren't *just* for styling.

See: JS.

With that in mind, I think "overloading" the class of an element is a better idea than over loading the rel attribute.