<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x430/54cad33d68bdc_-_capilano-cliffwalk-06-0911-xln-37698495.jpg>
<http://www.popularmechanics.com/technology/design/g664/the-daring-engineering-behind-vancouvers-capilano-cliffwalk/>