"Are a set of standards for embedding easily extractable data on your pages, using technologies you are comfortable with today."
Basically HTML tags with specific classes:
<body> <div class='hreview' />text</div> <div class='hcard' />text</div> </body> microformats
Common Tag
<body> <span typeof='ctag:Tag' rel='ctag:means' resource='http://rdf.freebase.com/ns/en.u2'/> </body> Common Tag