About: http://webisa.webdatacommons.org/101723171

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	For instance, there are more than 100 kinds of oil traded on the markets and we have only mentioned two, and middlemen between drillers and the gas station can number in the dozens.
http://www.w3.org/ns/prov#wasQuotedFrom	autoblog.com