<http://schema.org/image>
<http://rack.2.mshcdn.com/media/ZgkyMDEzLzA0LzA1LzgyLzEyNzUwMzIxMi5jNjg3YS5qcGcKcAl0aHVtYgkxMjAweDYyNyMKZQlqcGc/167141f4/364/127503212.jpg>
<http://mashable.com/2013/04/05/ipad-alternatives-for-school/>