Introduction to RDFa: Part 2
http://www.alistapart.com/articles/introduction-to-rdfa-ii/

Birbeck, Mark
List Apart, A
2009

Abstract:

RDFa (“Resource Description Framework in attributes”) is having its five minutes of fame: Google is beginning to process RDFa and Microformats as it indexes websites, using the parsed data to enhance the display of search results with “rich snippets.”