In this division—
"former" , for a provision of this Act, the Mineral Resources Act 1989 or the
Petroleum and Gas (Production and Safety) Act 2004 , means the provision as in
force from time to time before the commencement.
"post-commencement liability" means a liability for tax other than a
pre-commencement liability.
"pre-commencement liability" means a liability for a royalty-related amount
under the Mineral Resources Act 1989 or the
Petroleum and Gas (Production and Safety) Act 2004 arising before the
commencement.