<http://schema.org/url>
<http://www.technologyreview.com/view/425411/will-amazons-digital-library-kill-the-physical-one-lets-hope-not/>
<http://www.technologyreview.com/view/425411/will-amazons-digital-library-kill-the-physical-one-lets-hope-not/?nlid=nlcomp&nld=2011-09-14>