<http://schema.org/description>
"You've made a picture on your computer, pasted it into a Word document and would like to know how to place a watermark on the picture. Here's how to place a watermark on pictures."^^<http://www.w3.org/2001/XMLSchema#string>
<http://electronics.howstuffworks.com/cameras-photography/tips/how-to-place-watermarks-on-pictures.htm>