[Calls upon all States:] To recognize the right to education on the basis of equal opportunity by making primary education available, free and compulsory for all children, by ensuring that all children, particularly girls, children in need of special protection, children with disabilities, indigenous children, children belonging to minorities and children of different ethnic origins, have access without discrimination to education of good quality, as well as making secondary education generally available and accessible for all, in particular by the progressive introduction of free education, bearing in mind that special measures to ensure equal access, including affirmative action, contribute to achieving equal opportunity and combating exclusion;