PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Google is already able to determine reading level, presence/absence of citations and references and can distinguish content types into commercial, blog, news, forums, social networks and academic sites.
http://www.w3.org/ns/prov#wasQuotedFrom
  • moz.com