foreach $node ( keys( %{ $tree->{report}->{node} } ) ) {
  print "$node:values: $tree->{report}->{node}->{$node}->{values}\n";
}

##</code><code>##

my $simple = XML::Simple -> new (KeyAttr => 'node');

##</code><code>##

$tree = {
  'report' => {
    'ip' => '1.1.1.1',
    'id' => '0',
    'node' => [
      {
        'mid' => 'machine1',
        'time' => '110, 120, 130, 140, 150, 160',
        'name' => 'Winxp',
        'values' => '1, 2, 3, 4, 5, 6'
      },
      {
        'mid' => 'machine2',
        'time' => '110, 120, 130, 140, 150, 160',
        'name' => 'Win2003',
        'values' => '1, 2, 3, 4, 5, 6'
      }
    ]
  }
};