<http://schema.org/description>
"Every Internet user knows how frustrating\u00A0CAPTCHAs can be; they often require repeated attempts, can create barriers which deter users from completing your forms, and worst of all, ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/apps/2012/12/15/minteye-wants-to-put-an-end-to-the-captcha-as-we-know-it/>