<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://sev.h-cdn.co/assets/cm/15/08/54ea9f731b2d2_-_iphone-do-not-disturb-nnuvby-de.jpg>
<http://www.seventeen.com/life/a17913/iphone-tips-and-tricks/>