Article 12 of the Constitution of the Republic of Singapore guarantees to all persons equality before the law and equal protection of the law. The Article also identifies four forbidden classifications – religion, race, descent and place of birth – upon which Singapore citizens may not be discriminated for specific reasons. For example, discrimination on those classifications is prohibited in the appointment to any office or employment under a public authority or in the administration of any law relating to the establishing or carrying on of any trade, business, profession, vocation or employment.