A grand military welcome, a state dinner, tea at the White House and a tour of the National Archives: Chinese President Xi Jinping’s state visit to Washington will see his American counterpart, Donald Trump, roll out the pomp and pageantry.The United States’ capital is bracing for high-level bilateral discussions served with a side of symbolic gestures, marking Xi’s first state visit to the country since 2015.But what exactly makes this a state visit, and how does it differ from other official...