If you use an XPath capable parser/query engine, this is very easy, as getting the first and last node is just:
my $doc = ...; # read/parse XML file
my @first = $doc->findNodes('./*[1]');
my @last = $doc->findNodes('./*[last()]');
This is one of the huge advantages that XML (and XPath) buy you - your code gets much clearer and quicker to write.
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