<http://schema.org/mainEntityOfPage>
<http://www.upi.com/Top_News/US/2012/05/03/Observers-see-Romney-shift-to-center/82151336058591/>
<http://www.upi.com/Top_News/US/2012/05/03/Observers-see-Romney-shift-to-center/UPI-82151336058591/?rel=58621336116600>