I'm not sure about keeping the actual formating (indents, line breaks, comments), but what you're basically looking for is XSLT.

There exists in CPAN a few different XSLT modules (XML::XSLT, XML::LibXSLT, XML::ApplyXSLT), but I've never used any of them.

(I do enough XML work that I know of XSLT, yet never used it directly)

In reply to Re: Replacing things in XML files by jhourcle
in thread Replacing things in XML files by John M. Dlugosz

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