PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • We discuss how it???s a very hard problem to solve since pollution is an externality ??? that is, the people who generate pollution generally don???t pay the cost of their actions and therefore don???t have strong incentives to pollute less.
http://www.w3.org/ns/prov#wasQuotedFrom
  • freakonomics.com