<http://schema.org/url>
<http://extension.psu.edu/natural-resources/natural-gas/news/2012/02/understanding-the-role-of-liquefied-natural-gas-part-2>
<http://extension.psu.edu/natural-resources/natural-gas/news/2012/02/understanding-the-role-of-liquefied-natural-gas-part-2>