PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Additional features which could easily be added to the meta search engine of this invention include: Improved relevance measures, Alternative ordering methods, e.g. by site, Field searching e.g. page title, Usenet message subject, hyperlink text, Rules and/or learning methods for routing queries to specific search engines, Word sense disambiguation, and Relevance feedback.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.co.uk