Same answer as before. Unless the core game or a DLC includes the ability to do something, you're not going to find any XML stubs to let you do it for yourself. The devs did NOT put in much in the way of extra functionality; the few stubs that aren't directly used for Civ5 functions are usually relics of Civ4, many of which don't work any more.
You can make a building require another building to be in the same city, and for most purposes Wonders are just a different type of building. But there's no way to expand this to letting OTHER cities in your empire build something once a Wonder is complete, let alone letting other players build something.
But yet again, you CAN do this, and pretty much anything else you think of, in Lua by manipulating the CityCanConstruct gameevent.