<http://schema.org/caption>
"Gizmag compares the features and specs of the (early 2014) 13-in MacBook Air and the (late 2013) 13-in MacBook Pro with Retina Display"^^<http://www.w3.org/2001/XMLSchema#string>
<http://newatlas.com/2014-macbook-air-vs-retina-macbook-pro/31842/>