PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Attribute values that contain characters other than letters, digits and a few others must be enclosed in quotation marks (double or single).
http://www.w3.org/ns/prov#wasQuotedFrom
  • sitepoint.com