<http://schema.org/mainEntityOfPage>
<http://www.upi.com/Sports_News/2012/09/05/Serena-Williams-storms-into-semifinals/56431346881666/>
<http://www.upi.com/Sports_News/2012/09/05/Serena-Williams-storms-into-semifinals/UPI-56431346881666/?rel=77351347213069>