She is only 10, but Dai Jingya has already come face to face with more heads of state than most people will in their lifetimes. She has rubbed shoulders with Chinese President Xi Jinping four times, and greeted the leaders of Singapore, Afghanistan, Myanmar and Denmark. Dai is one of a group of children culled from Beijing schools to welcome the constant stream of foreign dignitaries coming to the capital to pay their respects, alongside People's Liberation Army soldiers and a host of top Chinese officials.