<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/cm/14/50/980x1338/548a985b8f972_-_rbk-caffeine-drinks-0313-13-s2.jpg>
<http://www.redbookmag.com/body/health-fitness/advice/g1548/how-much-caffeine-is-in-drinks/>