<http://schema.org/caption>
"This is a photo of the Doppler on Wheels (owned by the Center for Severe Weather Research) was taken on May 24, 2004."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.4029tv.com/article/majestic-monsters-tornadoes-captured-over-the-years/4913336>