According to the Parliamentary Education Office 'A parliament is an assembly of elected representatives of a people or a nation, which forms the supreme legislative (law-making) authority for that people or nation.'
This explains why the chief lawmaker, the Attorney General, is such a senior figure. Here is a list of all the Attorneys General for the Commonwealth of Australia:
William Morris (Billy) Hughes
Patrick McMahon (Paddy) Glynn
Francis (Frank) Brennan
Michael Neil O'Sullivan