<http://www.w3.org/1999/02/22-rdf-syntax-ns#rest>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#nil>
<http://www.popularmechanics.com/space/rockets/a7196/elon-musk-and-spacex-are-launching-a-new-era-of-private-spaceflight/>