I think DocClox said that if there are XML files old ones will be skipped so there shouldn't be duplicates.
But yes, something is borked with XML loading in this. I removed old files and left only XML ones and the game crashes when it finishes loading them. When I swap XML ones for old ones game loads fine. I tried with both XMLs from my editor and with the ones from DocClox, same result.
When I tried older trunk rev 77, week or so ago, and newer with 1.30, XMLs were loading fine.