Apologies in advance for what is likely a stupid question, but I have spent a good amount of time digging through xml files and searching the forums. Please help me out! Where is the +1 production modifier for sea resources from the seaport? I don't see any production modifiers in Buildings.xml, and a search for seaport only turns it up in one other xml file (policies.xml). I would like to add similar production modifiers for the shipyard, but I am not sure where to start. Thanks in advance!