<http://schema.org/about>
"The launch of the third Air Force X-37B spaceship, a secret space plane used for classified missions in Earth orbit, has been postponed, officials said."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/launch-of-air-force-x-37b-plane-delayed-again>