in reply to
How can I replace a line (tag) in an XML file?
This sounds like a good application for XML::XPath. Most of my XML parsing experience has been with XML::Simple's event based parsing, though.
Apparently it bears repeating: pretty much nothing is "a good application for XML::XPath" at this point in the life of the module (it hasn't been updated in over 8 years). In the DOM/XPath modules category, XML::LibXML is the recommended solution.
Use subroutines for code reuse
Master regular expressions
Write my GUIs with Perl
Abandon CGI in favor of some modern web framework
Put my code in modules
Create CPAN distributions
test and document my code as I write it
Write OOP with or without animal help
Finally switch to a modern Perl style
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