<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://esq.h-cdn.co/assets/cm/15/06/320x583/54d1c239a3631_-_esq-01-theory-38-0813-mdn-1.jpg>
<http://www.esquire.com/style/advice/g1584/theory-38-fall-2013/>