PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The situation is becoming very grave.2 looking or sounding quiet and serious, especially because something important or worrying has happened [= sombre]: Turnbull's face was grave as he told them about the accident. ???gravely adverb: Adam nodded gravely.
http://www.w3.org/ns/prov#wasQuotedFrom
  • ldoceonline.com