The first line of the XML data was <opt> and the last line of the XML data was </opt>.

That looks like a valid matching pair of opening and closing tags to me. Not sure I follow why you're suggesting that the OP to change <opt> to <opt/>, which in my opinion would leave an orphaned </opt> tag at the end.

Am I missing something?

In reply to Re^2: XML::Simple => XMLout() by Anonymous Monk
in thread XML::Simple => XMLout() by AlexTape

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