<http://schema.org/description>
"A poster from the Second World War advisting the public to keep quiet to avoid inadvertently passing information to the enemy. It features an RAF soldier putting his fingers to his lips in a gesture of silence."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mediastorehouse.com/world-war-two-information-poster/print/1378024.html>