Funded by the Australian Government, Department of Education, Skills, and Employment, Child Care Services Program, Strong Quality in Child Care, this resource's aim is 'celebrating and promoting children’s books by and about Australia’s Aboriginal and or Torres Strait Islander Peoples, including books in Indigenous languages.'
Source: https://www.ncacl.org.au/resources/databases/welcome-to-the-aboriginal-and-or-torres-strait-islander-resource/aim/
Find more information on the scope, content, sources, exclusions, etc. at the link above.
Note, per the National Centre for Australian Children's Literature, 'The Aboriginal and or Torres Strait Islander Resource focuses on books by and about Aboriginal and Torres Strait Islander People, so these books are generally not included in the Cultural Diversity Database.'