The Australian Statistical Geography Standard (ASGS) classification structures are split into two broads groups, the ABS Structures and the Non ABS Structures.
The ABS Structures are hierarchies of regions defined and maintained by the ABS. The regions that comprise the ABS Structures will remain unchanged until the next anticipated edition of the ASGS in 2021, which is timed for use in the next Census of Population and Housing.
The Non ABS Structures are hierarchies of regions which are not defined or maintained by the ABS, but for which the ABS is committed to providing a range of statistics. They generally represent administrative units, such as Postcode and Local Government Areas.
The ABS Structures are built directly from Mesh Blocks. Non ABS Structures are approximated by either Mesh Blocks, the Statistical Areas Level 1, or the Statistical Areas Level 2.