As with ‘most all great ideas, the principles were simple and, in hindsight, profoundly obvious. Do what designers were already doing. Instead of toiling over new languages that might or might not get adopted, use existing (X)HTML elements such as rel and class, and agree on such things as common class names for simple things like relationship definitions.
On behalf of all web designers and developers, thank you, Tantek and friends, and happy birthday.
[tags]microformats, semantics, realworld, tantek, xfn, hcard, 4years[/tags]