What are "xianggong" and "Xiagong"?

Xianggong and Xiagong are two brands of restaurants respectively. According to relevant data, the Chinese restaurant of Shangri-La Group's hotels is called Xianggong or Xiagong, and there are many restaurant signs, such as Jiangnan Stove in Nanxiang, Guihua Building in Jingxiang, , Xiagong and Chairman's Pavilion (Cantonese cuisine) in Beixiang. It is no exaggeration to say that Shangri-La ranks high among many high-end hotels, while other hotels such as Accor and Marriott are indeed inferior in the catering field. Jin Yong and Cai Lan like to patronize the restaurant of Shangri-La Hotel.