PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • It could, in future, be discovered that a photon can be found within a region much smaller than this (about 60 wavelengths of light), but already these limits are a long way from what one would expect of an extended wave, and encourage one further to think that a photon is a particle.
http://www.w3.org/ns/prov#wasQuotedFrom
  • reading.ac.uk