PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • In a recent YouTube video, Google's Matt Cutts explained why Google.com does not validate (historically has not) and also added that Google does not give any sort of boost to web pages that validate.
http://www.w3.org/ns/prov#wasQuotedFrom
  • seroundtable.com