<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/SearchAction>
<http://www.journaldunet.com/solutions/expert/52615/pourquoi-trop-de-projets-de-reseaux-sociaux-d-entreprise-echouent-dans-les-6-mois.shtml>