#!/usr/bin/perl

use strict;
use warnings;
use XML::Simple;
use Data::Dumper;


my $xml_simple    = XML::Simple->new( KeepRoot => 1, KeyAttr => 1, ForceArray => 1 );
my $response_hash = eval{ $xml_simple->XMLin( "cars.xml" ) };
print Dumper($response_hash);

Output :
$VAR1 = {
          'root' => [
                    {
                      'unsold' => [
                                  {
                                    'car' => [
                                             {
                                               'model' => [
                                                          'Hyundai'
                                                        ],
                                               'mileage' => [
                                                            '20000'
                                                          ]
                                             },
                                             {
                                               'model' => [
                                                          'Jeep'
                                                        ],
                                               'mileage' => [
                                                            '10000'
                                                          ]
                                             }
                                           ]
                                  }
                                ],
                      'footnotes' => [
                                     {
                                       'footnote' => [
                                                     {
                                                       'content' => 'F1 text',
                                                       'id' => 'F1'
                                                     },
                                                     {
                                                       'content' => 'F2 text',
                                                       'id' => 'F2'
                                                     }
                                                   ]
                                     }
                                   ]
                    }
                  ]
        };