<http://schema.org/description>
"London finally gets a 24-hour service on its underground rail network from Friday, but only at the weekends, and only on two lines, for now at least."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.reuters.tv/v/DqW/2016/08/19/night-tube-to-start-rolling-in-london>