<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54cb1b5997d22_-_bho-airship-11-0913-lgn-25370533.jpg>
<http://www.popularmechanics.com/flight/g1281/a-brief-history-of-the-airship/>