The Constitution sets up the Commonwealth of Australia as a federal polity, with enumerated limited specific powers conferred on the Federal Parliament. The State Parliaments are not assigned specific enumerated powers; rather the powers of their predecessor colonial Parliaments are continued except insofar as they are expressly withdrawn or vested exclusively in the Federal Parliament by the Constitution. The framers rejected an alternative model, the Canadian, which has been described as "an allocation of exclusive powers to both levels of government, not concurrent powers."