PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The cells do not contain any lead, mercury, cadmium, or other hazardous materials, heavy metals, or any toxic materials.
http://www.w3.org/ns/prov#wasQuotedFrom
  • sec.gov