my $xml_obj = XML::Simple->new(Keeproot => 1);

##</code><code>##

#!/usr/bin/perl
use strict;

use XML::Simple;
use Data::Dumper;

my $xml_obj = XML::Simple->new(Keeproot => 1, ForceArray => ['campaign']);

# xml
my $xml = $xml_obj->XMLin('test.xml');
print Dumper($xml);

my $out = $xml_obj->XMLout($xml);
print Dumper($out);

exit;
----------------------------------------------------------
$VAR1 = {
          'campaign' => [
                        {
                          'menuid' => '10118-2',
                          'action' => '0',
                          'phonenumbers' => {
                                            'phonenumber' => {
                                                             'number' => '4167781583',
                                                             'prompts' => {
                                                                          'prompt' => {
                                                                                      'tts' => 'Hello, this is a test.',
                                                                                      'promptid' => '2'
                                                                                    }
                                                                        },
                                                             'callid' => '1234abc'
                                                           }
                                          }
                        }
                      ]
        };

$VAR1 = '<campaign action="0" menuid="10118-2">
  <phonenumbers name="phonenumber" callid="1234abc" number="4167781583">
    <prompts name="prompt" promptid="2" tts="Hello, this is a test." />
  </phonenumbers>
</campaign>
';


##</code><code>##

#!/usr/bin/perl
use strict;

use XML::Simple;
use Data::Dumper;

my $xml_obj = XML::Simple->new(ForceArray => ['campaign']);

# xml
my $xml = $xml_obj->XMLin('test.xml');
print Dumper($xml);

my $out = $xml_obj->XMLout($xml);
print Dumper($out);

exit;

------------------------------------------------------
$VAR1 = {
          'menuid' => '10118-2',
          'action' => '0',
          'phonenumbers' => {
                            'phonenumber' => {
                                             'number' => '4167781583',
                                             'prompts' => {
                                                          'prompt' => {
                                                                      'tts' => 'Hello, this is a test.',
                                                                      'promptid' => '2'
                                                                    }
                                                        },
                                             'callid' => '1234abc'
                                           }
                          }
        };

$VAR1 = '<opt action="0" menuid="10118-2">
  <phonenumbers name="phonenumber" callid="1234abc" number="4167781583">
    <prompts name="prompt" promptid="2" tts="Hello, this is a test." />
  </phonenumbers>
</opt>
';