PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Power plants and boilers would be required to limit their emissions of ???heavy metals,??? including mercury, arsenic, chromium, and nickel, and of acid gases, such as hydrogen chloride and hydrogen fluoride.
http://www.w3.org/ns/prov#wasQuotedFrom
  • manhattan-institute.org