<http://schema.org/about>
"As festival season rolls on, many party goers will have been putting up with the ordeal of smelly, chemical-laden and often disgustingly soiled portable toilets. But it doesn't have to be that way. Roskilde's p-trees"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/bathroom-design/portable-composting-toilets-for-festivals-homes-and-more.html>