Expert System - Australian Flags by McGoo Software

Based on the responses you have made:

The flag is most probably the state flag of South Australia

Conclusion Notes:

The flag of South Australia is a British Blue Ensign defaced with the state badge. The badge depicts a white-backed piping shrike (magpie) with wings outstretched on a yellow disc. The state badge is believed to have been designed by Robert Craig of the Adelaide School of Arts. The impetus for a new state badge appears to date back to 1901 in response to the former British Colonies becoming states of the Australian federation. Also, the former badge was extremely elaborate and no doubt proved to be cumbersome and difficult to reproduce on a regular basis.

Expert System Rule:

IF on the flag the Southern Cross is not visible
AND on the flag there is a Union Jack present
AND the symbol on the fly of the flag looks like a bird
AND the bird is magpie
THEN the flag is most probably the state flag of South Australia.

Calculated Certainty Factor: 0.72 = most probably