<http://schema.org/about>
"There are often simple, low-tech solutions to difficult problems, including some ingenious ones from the great age of engineering in the last half of the nineteenth century. Kris at Low Tech"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/cars/poo-poo-train-runs-on-the-weight-of-sewage.html>