<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://edc.h-cdn.co/assets/cm/15/04/480x319/54c1b1bf5c284_-_edc050114edgoesto23_1-xln.jpg>
<http://www.elledecor.com/life-culture/travel/g872/guide-to-porto/>