<http://schema.org/image>
<http://rack.1.mshcdn.com/media/ZgkyMDEyLzEyLzA0LzY1L3dhbG1hcnRvZmZlLmJDOS5qcGcKcAl0aHVtYgkxMjAweDYyNyMKZQlqcGc/5b1114b7/ed6/walmart-offers-free-shipping-on-60-000-items-a78d41f31f.jpg>
<http://mashable.com/2010/11/11/walmart-free-shipping/>