That is to say, as in so many other aspects of Chinese existence, li is even more central than itis in other-than-Chinese city-planning concepts. Ancient Ur has its ceremonial center and limits; so does Rome.
古老的烏爾城 (Ur，美索不達米亞平原南部重要城市) 有其典禮中心 (ceremonial center) 與界限，羅馬城亦然，而長安城本身就是一個完整的中心。