<http://schema.org/pub_year>
"2013"^^<http://www.w3.org/2001/XMLSchema#integer>
<http://mashable.com/2013/01/18/google-plus-communities-beginners-guide/?WT.mc_id=en_my_stories&amp&amp&amp?WT.mc_id=en_my_stories&amp&amp&amp>