In this photo taken Sept. 1, 2012 and released by China's Xinhua News Agency, Chinese Vice President Xi Jinping addresses the opening ceremony of the autumn semester of the Party School of the Communist Party of China in Beijing. Chinese micro-bloggers and overseas websites have come up with all kinds of creative speculation as to why President-in-waiting Xi has gone unseen for more than a week. (AP Photo/Xinhua, Li Tao) NO SALES