Preventing BeautifulSoup from converting my XML tags to lowercase

I am using BeautifulStoneSoup to parse an XML document and change some attributes. I noticed that it automatically converts all XML tags to lowercase. For example, my source file has <DocData> elements, which BeautifulSoup converts to <docdata>. This appears to be causing problems since the program I am feeding my modified XML document to does not seem to accept the lowercase versions. Is there a way to prevent this behavior in BeautifulSoup?

From stackoverflow

• No, that's not a built-in option. The source is pretty straightforward, though. It looks like you want to change the value of encodedName in Tag.__str__.