It seems there might be a slight misconception. Rava is actually not milled from maida. Both rava (semolina or sooji) and maida are different wheat products.
Rava is made by grinding husked wheat and is coarser than maida. It is commonly used in various Indian dishes like upma, idli, and halwa.
On the other hand, maida is a finely milled wheat flour without any bran, and it is often used in baking and to make various Indian sweets and snacks.