PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The spectra of galaxies can vary greatly, and spectra for stars, quasars, and other types of objects look different.
http://www.w3.org/ns/prov#wasQuotedFrom
  • sdss.org