UNESCO Convention Against Discrimination in Education, Articles 1, 2(b) and 5.1(c)
1. For the purpose of this Convention, the term “discrimination” includes any distinction, exclusion, limitation or preference which, being based on race, colour, sex, language, religion, political or other opinion, national or social origin, economic condition or birth, has the purpose or effect of nullifying or impairing equality of treatment in
education and in particular:
(a) Of depriving any person or group of persons of access to education of any type or at any level;
(b) Of limiting any person or group of persons to education of an inferior standard;
(c) Subject to the provisions of article 2 of this Convention, of establishing or maintaining separate educational systems or institutions for persons or groups of persons; or
(d) Of inflicting on any person or group of persons conditions which are incompatible with the dignity of man.
2. For the purposes of this Convention, the term “education” refers to all types and levels of education, and includes access to education, the standard and quality of education, and the conditions under which it is given.
When permitted in a State, the following situations shall not be deemed to constitute discrimination, within the meaning of article 1 of this Convention:
(b) The establishment or maintenance, for religious or linguistic reasons, of separate educational systems or institutions offering an education which is in keeping with the wishes of the pupil’s parents or legal guardians, if participation in such systems or attendance at such institutions is optional and if the education provided conforms to such standards as may be laid down or approved by the competent authorities, in particular for education of the same level;
1. The States Parties to this Convention agree that:
(c) It is essential to recognize the right of members of national minorities to carry on their own educational activities, including the maintenance of schools and, depending on the educational policy of each State, the use or the teaching of their own language, provided however:
(i) That this right is not exercised in a manner which prevents the members of these minorities from understanding the culture and language of the community as a whole and from participating in its – activities, or which prejudices national sovereignty;
(ii) That the standard of education is not lower than the general standard laid down or approved by the competent authorities; and
(iii) That attendance at such schools is optional.