<http://schema.org/about>
"What happens when you survey 1,000 British parents and 500 children on their leisure activities? You might find out that a quarter of the kids don't play outside. Or that 12% of adults admit to having 'no interest'"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/culture/25-of-british-children-dont-play-outside.html>