Non-<answer>Australia</answer>n citizens who are <answer>Australia</answer>n permanent residents should be aware that during their stay on Norfolk Island they are "outside of <answer>Australia</answer>" for the purposes of the Migration Act. This means that not only will they need a still-valid migrant visa or Resident return visa to return from Norfolk Island to the mainland, but also the time spent in Norfolk Island will not be counted for satisfying the residence requirement for obtaining a Resident return visa in the future. On the other hand, as far as <answer>Australia</answer>n nationality law is concerned, Norfolk Island is a part of <answer>Australia</answer>, and any time spent by an <answer>Australia</answer>n permanent resident on Norfolk Island will count as time spent in <answer>Australia</answer> for the purpose of applying for <answer>Australia</answer>n citizenship.
As far as Australian nationality law goes, Norfolk Island is considered a part of what?
Australia