About: http://webisa.webdatacommons.org/285004918

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	Strictly speaking, petroleum consists of hydrocarbons: compounds of hydrogen and carbon; and non-hydrocarbon fractions: compounds which might also include nitrogen, sulfur, oxygen, or traces of metals such as vanadium or nickel.
http://www.w3.org/ns/prov#wasQuotedFrom	qi.com