<http://schema.org/description>
"Duolingo today launched Test Center, its own English language certification exam that can be taken on the Web or an Android device.\r\n\r\nThe fresh alternative to standardized language ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/insider/2014/07/23/duolingo-launches-test-center-20-alternative-standardized-language-tests/>