<http://schema.org/pub_year>
"2012"^^<http://www.w3.org/2001/XMLSchema#integer>
<http://mashable.com/2012/04/19/water-flows-backward/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A%20Mashable%20%28Mashable%29&utm_content=Google%20Reader>