Dunhuang manuscript S.6388 is a classical Chinese commentary on the Śrīmālādevīsiṃhanāda Sūtra 勝鬘経.Akira Fujieda inferred that S.6388 was written in China between A.D. 515 and the accomplishment of the Shengmanjing yiji 勝鬘経義記,a work of Jingyingsi Huiyuan 浄影寺慧遠 (523–592). Thechnical terms of the Shidijing lun 十地経論 can be found in S.6388.
The author of S.6388 re-explains the theory of gotra 種姓 through the stages of the bodhisattva, and S.6388 says the dashengwen 大声聞 is in fact the bodhisattva. Furthermore, S.6388 asserts that tathāgatagarbha is a saṃskṛta dharma, and the dharmakāya is an asaṃskṛta dharma. The ti 体 of tathāgatagarbha is invariant. On the contrary, the yong 用 of tathāgatagarbha, which can act as a saṃskṛta dharma, is movable. This theory is very near to the explanation of Fashang 法上 (495–580), who belongs to the early Dilun school. In addition, the author of S.6388 was not familiar with the Dasheng qi xin lun 大乗起信論,because there is merely correspondence between them.