Article: Even the Zhonghua Zihai does not include characters in the Chinese family of scripts created to represent non-Chinese languages. Characters formed by Chinese principles in other languages include the roughly 1,500 Japanese-made kokuji given in the Kokuji no Jiten, the Korean-made gukja, the over 10,000 Sawndip characters still in use in Guangxi, and the almost 20,000 Nôm characters formerly used in Vietnam.[citation needed] More divergent descendents of Chinese script include Tangut script, which created over 5,000 characters with similar strokes but different formation principles to Chinese characters.

Question: What is formed by Chinese principles? 
Characters