<http://schema.org/about>
"When many of us think of \"nature\" we probably think of forests, lakes, or meadows. We know that we see nature in our gardens or in our neighborhood parks. Chances are good that when we're walking"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/natural-sciences/studying-nature-in-the-middle-of-manhattan.html>