<http://schema.org/keywords>
"os x"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.gottabemobile.com/2011/02/25/os-x-10-7-begins-to-unite-ios-and-os-x-will-apple-ever-release-a-mac-pad-pro-tablet-with-os-x/>