<http://schema.org/about>
"A rare opportunity to see the planet Venus cross in front of the face of the sun is coming up next week.  On June 5 to 6, Venus will \"transit\" the sun for the l"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/transit-of-venus-puts-spotlight-on-planetary-sun-crossings>