The Confucian tradition holds that the collection, one of the Wu Jing, or Five Classics, came to what we have today after the editing of Confucius. The collection was officially acknowledged as one of "Five Classics" during the Han Dynasty, and previously in Zhou Dynasty Shi (詩) was one of "Six Classics". Four schools of commentary existed then, namely the Qi (齊), the Lu (魯), the Han (韓), and the Mao (毛) schools. The first two schools did not survive. The Han school only survived partly. The Mao school became the canonical school of Book of Songs commentary after the Han Dynasty. As a result, the collection is also sometimes referred to as "Mao Shi" (毛詩).