<http://schema.org/pub_date>
"06/22/2011"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2011/06/22/qr-code-apps-android/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A%20Mashable%20%28Mashable%29>