The legal systems of most Muslim-majority countries can be classified as either secular or mixed. Sharia plays no role in secular legal systems. In mixed legal systems, Sharia rules are allowed to influence some national laws, which are codified and may be based on European or Indian models, and the central legislative role is played by politicians and modern jurists rather than the ulema (traditional Islamic scholars). Saudi Arabia and some other Gulf states possess what may be called classical Sharia systems, where national law is largely uncodified and formally equated with Sharia, with ulema playing a decisive role in its interpretation. Iran has adopted some features of classical Sharia systems, while also maintaining characteristics of mixed systems, like codified laws and a parliament.