<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/WebSite>
<http://www.shenker.com/index.php?sezione=cultural-magazine&scelta=focus-on.php&sceltaMenu=FOCUS-ON&selezione=focus-on/obama-nazioni-unite-inglese.htm>