PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • It aims to differentiate itself from other search engines such as Google and Yahoo by identifying the most popular sites in real-time and by becoming, in effect, the Skype for search.
http://www.w3.org/ns/prov#wasQuotedFrom
  • phys.org