<http://schema.org/keywords>
"News, Policy, Politics, Global Business, International, Companies, Regulation, Oil and Gas, Energy, Africa, Mining and Metals, story"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bloomberg.com/bw/magazine/keeping-petrodollars-out-of-despots-pockets-08252011.html>