Executive power of the Union covers parliamentary subjects and treaty rights but is limited within States by constitutional provisions. The Union's executive power extends to matters Parliament may legislate and to rights and jurisdiction under treaties; it is subject to the Constitution and Parliamentary law and does not, except where expressly provided, extend within a State to matters on which the State Legislature also has competence. Until Parliament provides otherwise, States and their officers may continue exercising, in respect of matters within Parliament's power for that State, the executive functions they held immediately before the Constitution's commencement.