<http://schema.org/topics>
"Apple,Apple TV,Apps and Software,Dev &amp; Design,Gadgets,iPad,iPad Mini,Macbook Pro,Macbook Pro Retina,Mobile,Tech,Uncategorized"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2013/10/20/apple-inventory-ipad-retina-macbook-pro/>