PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • it is the most touch-friendly of the products I tested and the most transparent about cases where it is incompatible with Office.
http://www.w3.org/ns/prov#wasQuotedFrom
  • wsj.com