<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/640x496/54cfd209c3881_-_ufo-usaf-02-1012-de.jpg>
<http://www.popularmechanics.com/flight/a11941/government-releases-more-declassified-flying-saucer-docs-13821358/>