<http://schema.org/mainEntityOfPage>
<http://www.upi.com/Top_News/US/2013/03/18/Limbaugh-blasts-RNC/17751363637864/>
<http://www.upi.com/Top_News/US/2013/03/18/Limbaugh-blasts-RNC/UPI-17751363637864/?rel=90501378575477>