PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Thus, while there have been previous attempts to form gaseous products alone or with carbonaceous material, such as carbon black, it has been difficult to create a process which will efficiently and effectively form substantial amounts of carbon black in combination with substantial amounts of hydrogen or hydrogen and carbon monoxide and to remove the sulfur from the gases.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com