<http://schema.org/about>
"A new study concludes that by the time you read 23 books on your Kindle, it has a lower environmental inpact than the production of books. Other people are jumping into the E-book biz and soon they might be common, affordable and even DRM free. Would"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/culture/will-you-switch-to-an-e-book.html>