<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://wdy.h-cdn.co/assets/cm/15/09/980x753/54ebca9ecc1e1_-_hot-dog-on-white-s2.jpg>
<http://www.womansday.com/health-fitness/womens-health/advice/g1398/foods-that-cause-headaches/?click=try>