There are plenty of XML modules on CPAN, try XML::Simple:

# 639260.pl
# 639260.xml contains xml data

use strict;
use warnings;
use XML::Simple;
use Data::Dumper;
my $ref = XMLin();

print Dumper($ref);
$ref->{LOCATION}->{name} = '1stfloor';
print Dumper($ref);
__END__
$ perl -wl 639260.pl
$VAR1 = {
          'url' => 'http://somewhere',
          'PROJECT' => {
                       'name' => 'test_project'
                     },
          'USER' => {
                    'email' => 'some@email.com'
                  }
        };

$VAR1 = {
          'LOCATION' => {
                          'name' => '1stfloor'
                        },
          'url' => 'http://somewhere',
          'PROJECT' => {
                       'name' => 'test_project'
                     },
          'USER' => {
                    'email' => 'some@email.com'
                  }
        };
[download]

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