Then where is the functionality for the tags <EarlyArtDefineTag>, <MiddleArtDefineTag>, and <LateArtDefineTag> located in the DLL? I was thinking of just copying and then pasting the code into the Civ4 Colonization DLL of a mod. This is because I want units to change skins based on the game era, however Colonization only has <ArtDefineTag> so units can't change with era changes.