The legal system of Ukraine is based on the framework of civil law, and belongs to the Romano-Germanic legal tradition. The main source of legal information is codified law. Customary law and case law are not as common, though case law is often used in support of the written law, as in many other legal systems. Historically, the Ukrainian legal system is primarily influenced by the French civil code, Roman Law, and traditional Ukrainian customary law. The new civil law books (enacted in 2004) were heavily influenced by the German Bürgerliches Gesetzbuch .