<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/technology/design/a9440/building-a-giant-mechanical-exoskeleton-one-six-foot-leg-at-a-time-15880279/>