The xmls are pretty easy to figure out, just need a copy of them, either the originals (can get the originals by using the unpacker you can find, the wiki at the moddingofisaac subreddit links to it, may have to use Windows, not sure if there's a way to get it working on anything else, haven't tried) or one of the modified ones from a mod, preferably one with the commentary still intact but they're easy enough to figure out without it. For things like item IDs you can get them from Platinumgod. Room editing and stuff is a bit more complex.
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