 The post-Vedic texts, particularly "Manusmriti" mentions outcastes and suggests that they be ostracised.Recent scholarship states that the discussion of outcastes in post-Vedic texts is different from the system widely discussed in colonial era Indian literature, and in Dumont's structural theory on caste system in India.Patrick Olivelle, a professor of Sanskrit and Indian Religions and credited with modern translations of Vedic literature, Dharma-sutras and Dharma-sastras, states that ancient and medieval Indian texts do not support the ritual pollution, purity-impurity premise implicit in the Dumont theory.