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my $parser = XML::LibXML->new();
my $doc = $parser->parse_file($file);
...
    }
my $path = '//fooResponse/info/fooTransaction/transactionDetail/histFi
+le:transactionSummary/summary:PacManScore';
my @nodes = $xc->findnodes($path);

//fooResponse/info/fooTransaction/transactionDetail/histFile:transacti
+onSummary/summary:PacManScore

//*/info/fooTransaction/transactionDetail/*

//*/info/fooTransaction/transactionDetail/histFile:transactionSummary/
+*

<Extract>
  <Service>
...
    </Transaction>
  </TransactionList>
</Extract>