<http://schema.org/description>
"The first real line of defense against the heat is a building&amp;#039;s roof. And some materials are better than others -- especially in hot climates. See which ones are best at keeping the heat at bay."^^<http://www.w3.org/2001/XMLSchema#string>
<http://home.howstuffworks.com/home-improvement/construction/green/10-best-roofing-materials6.htm>