I'd like to write a function which can access the values of a substructure. For example, if I have structure (USA), containing another (states) then values within that substructure, I know I could access the GDP of the state PA through:
USA.PA.GDP
How can I create a generic function, GetGDP so that I can get the same result by
GetGDP(PA).
Similarly, I could enter any state (i.i MD or CA) and return the GDP of that given state.
This is a simplified example of a more complex system, but this is the fundamental challenge I am facing
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