<http://schema.org/headline>
"Tumblr will be down for a few hours this Saturday for \u2018last major step\u2019 in infrastructure upgrade"^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/insider/2012/09/30/all-tumblr-blogs-will-unavailable-hours-saturday-due-scheduled-maintenance/>