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.
A foolish day
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Internet cleaning day
The real first day of Spring
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Wait a second, ... is this poll a joke?
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