<http://schema.org/about>
"The cancellation of the New York Marathon left 50,000 runners with restless legs and no race. Organizers over Philadelphia step in to help by opening new slots"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/health/fitness-well-being/stories/sold-out-philadelphia-marathon-opens-3000-slots-for-nyc-entrants>