<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/768x516/54cad33cd0e05_-_capilano-cliffwalk-04-0911-xln-63021893.jpg>
<http://www.popularmechanics.com/technology/design/g664/the-daring-engineering-behind-vancouvers-capilano-cliffwalk/>