That's the output you get from

warn Dumper $t;
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Why do you do that when you don't know what happens there?

Maybe you want to store or print a value when XML::Twig invokes the callback for your node, in the following callback?

'CustDetails' => sub { $_->first_child('CustomerId')->text(), }
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Maybe something like the following:

'CustDetails' => sub { print "The first customer has the following det
+ails: " . $_->first_child('CustomerId')->text(), }
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