PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • SAT is the most famous NP-complete problem, and as such we know it very well in theory but have no idea how to solve it.
http://www.w3.org/ns/prov#wasQuotedFrom
  • ibm.com