This law will hardly be enforced, as one is afraid to be accused of discrimination or getting aggressive responses. Dutch natives rather keep their mouth shut instead of taking the risk of getting in trouble. Reason; we are taught to be politically correct. Most people do not dare to admit their votes for anti-islam party Geert Wilders.

... that's a niqab.

The hejab which is covering one's hair is the norm, although I don't think anyone should be forced to wear that. The "nigab" on the other hand is worn by some ultra-conservative Arab women. Europe does not have to accept that at all.