[1] For example, a nation or territory may require a person to hold a professional qualification to practice an occupation, such as medicine.
This way, the state controls and regulates access; for example, physicians of unknown competence may not practice, and it may be desired to protect the employment of local people.
In the early twenty-first century, there was much controversy about recognizing marriages between couples of the same sex.
[2] The derogation of this right this is prohibited, even during the proclamation of public emergencies that threaten the life of the nation.
Diplomatic recognition is a similar concept whereby one state acknowledges the existence as an entity of another.