<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/54cfd20a4ed48_-_ufo-usaf-01-1012-de.jpg>
<http://www.popularmechanics.com/flight/a11941/government-releases-more-declassified-flying-saucer-docs-13821358/>