PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Researchers have prepared various forms of gels, including hydrogels, organogels, aerogels, and xerogels.
http://www.w3.org/ns/prov#wasQuotedFrom
  • acs.org