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use XML::Simple;
my $struct = XMLin( \*DATA );
...
                <value>hello3</value>
        </level3>
</myconfig_data>

<opt>
  <name>aaa</name>
...
    <value>hello3</value>
  </level3>
</opt>

use Data::Dumper;

...
                <value>hello3</value>
        </level3>
</myconfig_data>

$VAR1 = {
          'level1' => {
...
                        'value' => 'hello3'
                      }
        };