China

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The People's Republic of China is a unitary multi-national state built up jointly by the people of all its nationalities. Socialist relations of equality, unity, mutual assistance, and harmony have been established among the nationalities and will continue to be strengthened. In the struggle to safeguard the unity of the nationalities, it is necessary to combat big-nation chauvinism, mainly Han chauvinism, and also necessary to combat local-national chauvinism. The state does its utmost to promote the common prosperity of all nationalities in the country.
… (Preamble)

All nationalities in the People’s Republic of China are equal. The State protects the lawful rights and interests of the minority nationalities and upholds and develops a relationship of equality, unity, mutual assistance, and harmony among all of China's nationalities. Discrimination against and oppression of any nationality are prohibited; any acts that undermine the unity of the nationalities or instigate their secession are prohibited.
The state helps the areas inhabited by minority nationalities speed up their economic and cultural development in accordance with the peculiarities and needs of the different minority nationalities.
Regional autonomy is practiced in areas where people of minority nationalities live in compact communities; in these areas organs of self-government are established for the exercise of the right of autonomy. All the national autonomous areas are inalienable parts of the People's Republic of China.
The people of all nationalities have the freedom to use and develop their own spoken and written languages, and to preserve or reform their own ways and customs. (Art. 4)

The National People's Congress is composed of deputies elected from the provinces, autonomous regions, municipalities directly under the Central Government, and the special administrative regions, and of deputies elected from the armed forces. All the minority nationalities are entitled to appropriate representation.
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Minority nationalities are entitled to appropriate representation on the Standing Committee of the National People’s Congress.
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The State Council exercises the following functions and powers:
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(11) To direct and administer affairs concerning the nationalities and to safeguard the equal rights of minority nationalities and the right of autonomy of the national autonomous areas;
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The state gives financial, material and technical assistance to the minority nationalities to accelerate their economic and cultural development.
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Citizens of all nationalities have the right to use the spoken and written languages of their own nationalities in court proceedings. The people's courts and people's procuratorates should provide translation for any party to the court proceedings who is not familiar with the spoken or written languages in common use in the locality.
In an area where people of a minority nationality live in a compact community or where a number of nationalities live together, hearings should be conducted in the language or languages in common use in the locality; indictments, judgments, notices and other documents should be written, according to actual needs, in the language or languages in common use in the locality. (Art. 139)