As racha says, MaxGlobalInstances is what makes a world wonder only available once per game. It is always set within the <BuildingClasses> table to "1" for World Wonders. And as DoctorMcGann mentioned, MaxPlayerInstances within <BuildingClasses> table limits how many of a building each civilization can construct. But for National Wonders there's more to it than that. See here for other issues regarding the way National Wonders are structured within the XML.
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