The spelling of a name is divided into two parts according to the surname and the first name, with the middle separated and the first letter capitalized. There is no special requirement for adding tones. For example, Li Shimin can be spelled "Li Shimin".
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Chinese Pinyin is a tool to assist Chinese pronunciation. Article 18 of the General Language and Characters Law of People's Republic of China (PRC) stipulates: "The Chinese Pinyin Scheme is a unified standard for spelling Roman letters in Chinese names, place names and Chinese documents, and it is used in areas where Chinese characters are inconvenient or unusable." The symbols written according to this set of norms are called Chinese Pinyin.
Chinese Pinyin is also an internationally recognized modern standard for Latin transliteration of Chinese.