Introduction to RDFa II

In part I of this series, we looked at how semantic features normally confined to the head of an HTML document can be used to add semantic richness to the elements of the body. Along the way, we defined six rules of RDFa. In part II, we’ll learn how to add properties to an image, and how to add metadata to any item—and we’ll add a few more rules to that list.
Original article from http://www.alistapart.com/articles/introduction-to-rdfa-ii/