Expert System - Australian Flags by McGoo Software

Based on the responses you have made:

The flag is most probably the Eureka Flag

Conclusion Notes:

The Eureka Flag is a design which features: a dark blue field a horizontal stripe and a vertical line crossing it ; and 5 eight pointed stars, representing the Crux Australis constellation. The design was first used for the war flag of the Eureka Rebellion of 1854 at Ballarat in Victoria, Australia. Rebels swore an oath to the flag as a symbol of defiance at its first flying at Bakery Hill and 22 were killed at the Eureka Stockade defending the original flag (now held at the Ballarat Fine Art Gallery). The flag design has gained wider notability in Australian culture due to its adoption by radicals as a symbol of democracy, and general purpose symbol of protest, mainly in relation to a variety of anti-establishment, non-conformist causes. It is listed as an object of state heritage significance on the Victorian Heritage Register and was named as a Victorian Icon by the National Trust in 2006.

Expert System Rule:

IF on the flag the Southern Cross is visible
AND on the flag there is no Union Jack present
AND the field of the flag is blue
THEN the flag is most probably the Eureka Flag.

Calculated Certainty Factor: 0.71 = most probably