PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The traditional fluorescent???or gas discharge???lamp comprises a tube containing an inert gas and a material such as mercury vapor which, when ionized, can collide with electrons of a current flow across the electrodes of a lamp, and emit photons.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com