How to implement "gain X of yield A for every Y of yield B"?

Raitaki

Chieftain
Joined
Oct 19, 2015
Messages
24
I would like to have a building give X Food for every Y Science/turn in its city. I know this is possible for national yields, but is it possible to do this for a city yield like Food or Production? Also, would XML/SQL be suffice for implementing this effect, or would LUA scripting be necessary?
 
Lua scripting for sure is necessary.
 
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