<http://schema.org/about>
"It's a tradition:  heads of state exchange gifts when visiting each other.  So on his recent trip to the USA, Prime Minister Cameron has given President Obama a piece of graffiti art by British graffiti artist Ben Eine.  In fact it"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/culture/president-obama-gets-graffiti-art-and-organic-beer-as-gifts.html>