<http://schema.org/about>
"Skywatchers should circle on Friday, Aug. 31 on their calendars, for the date offers the last chance to see a so-called \"blue moon\" for nearly three years."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/blue-moon-to-light-up-the-night-sky-this-week>