<http://schema.org/description>
"Google has deprecated the use of their YouTube API v2 in favor of API v3. API v3 requires an api key in order to search YouTube and return the results which we do in our video dialog."^^<http://www.w3.org/2001/XMLSchema#string>
<https://success.mindtouch.com/Documentation/MindTouch4/Optimization/Enhance_with_media/Upgrade_your_YouTube_API_v3_key>