How to convert tags in all tags in xml to lowercase without changing case of atribute values?

Question

I\'ve inherited some xml files which has all tags in uppercase. I would like to convert them to lowercase using either a regular expression or via XSLT. It would be handy to be

Answer 1

Try (untested):

XSLT 2.0:

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The XSLT 1.0 version of the above would go like this:

However, this is assuming your element and attribute names do not contain upper-case characters other than the 26 explicitly listed (i.e. no Russian, Greek, diacritics, etc.).