About: http://webisa.webdatacommons.org/402126700

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	what is with the roll?When you buy an oil, natural gas, or other commodity ETF, what you are really buying is a futures contract of that commodity.
http://www.w3.org/ns/prov#wasQuotedFrom	fool.com