46The difference in treatment which arises from a condition of residence being imposed on students who are the children of frontier workers thus constitutes indirect discrimination on the ground of nationality which is in principle prohibited, unless it is objectively justified. In order to be justified, it must be appropriate for securing the attainment of a legitimate objective and must not go beyond what is necessary to attain that objective (see, to that effect, Case C-73/08 Bressol and Others [2010] ECR I-2735, paragraphs 47 and 48, and Commission v Netherlands, paragraph 55).
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