<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://esq.h-cdn.co/assets/cm/15/06/320x620/54d1c23a1b0f0_-_esq-03-theory-38-0813-mdn.jpg>
<http://www.esquire.com/style/advice/g1584/theory-38-fall-2013/>