Datong liaison office in Beijing has a catering department. Datong liaison office in Beijing has a specially set up canteen, where eating is very cheap. This is the catering department of Datong Liaison Office in Beijing. So Datong liaison office in Beijing has a catering department. Datong, formerly known as Yunzhong, Pingcheng and Yunzhou, is a prefecture-level city under the jurisdiction of Shanxi Province and one of the provincial sub-central cities established by the Shanxi Provincial Government.