<http://schema.org/about>
"For at least 3700 years, since the code of Hammurabi, builders of houses have had building codes, a government minimum standard intended to protect the  health and safety of its citizens. Possibly in"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/sustainable-product-design/5-building-code-changes-that-absolutely-cannot-wait-until-2030.html>