<http://schema.org/pub_year>
"2013"^^<http://www.w3.org/2001/XMLSchema#integer>
<http://mashable.com/2013/10/14/google-play-tablet-apps/?utm_campaign=Mash-Prod-RSS-Feedburner-Mobile-Partial&utm_cid=Mash-Prod-RSS-Feedburner-Mobile-Partial&utm_medium=feed&utm_source=rss>