BEIJING (AP) — The crucial parts will be held behind closed doors, but journalists, academics and more than a billion Chinese citizens will be closely watching for any public hints signaling change at this week's twice-a-decade congress of China's ruling Communist Party. Possible outcomes include the emergence of President Xi Jinping's closest allies, signs indicating the direction of an increasingly aggressive foreign policy and clues about the possible next leader of the world's second-biggest economy. Five things to watch for: ___ SIGNS OF XI'S POWER Observers are watching to see if Xi's personal political theory will be entered into the party constitution alongside those of predecessors such as Mao Zedong and Deng Xiaoping.