Crucifixes are indeed also banned. It is a religious custom to wear a crucifix just as it is to wear a headscarf. This was not a discriminatory measure; quite the opposite. The theory is that the younger and more noticably societies distinguish themselves along religious lines (and lets be honest, it is likely to be parents rather than the schoolchildren themselves who are militant about the right to wear headscarves in schools) the more impossible it makes it that societies will properly manage to integrate. There is not, and never could be, an absolute right for everybody to wear what they want in a place like a school.