<http://schema.org/dateModified>
"2013-06-12T10:49:49-04:00"^^<http://schema.org/Date>
<http://www.upi.com/Science_News/Blog/2013/06/12/Mars-Dry-ice-hovercraft-sled-down-sand-dunes/4971371046431/?st_rec=8431371050431>