<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/WebSite>
<http://www.journaldunet.com/solutions/seo-referencement/selection/10-outils-gratuits-pour-referenceurs-avertis/google-insights-for-search-un-complement-a-google-trends.shtml>