XML::Twig first_child_matches question

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for my $para ( $root->children('para') ) {
       if ( $para->first_child_matches('get_this') ) {
            print $para->first_child('get_this')->att('value');
       }
}

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use strict;
use warnings;
...
       }
}

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Here is XML file 
<root>
...
444
555
XXX

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