#!/usr/bin/perl --

use strict;
use warnings;

use XML::Simple;

my $xml = <<'__XML__';
<ROOT>
    <SUB CLASSNAME="SUB1">
        <Element1 Type="Type1">Type 1 value</Element1>
        <Element2 Type="Type2">Type 2 value</Element2>
    </SUB>
    <SUB CLASSNAME = "SUB2">
        <Element1 Type="Type1">Type 1 value</Element1>
        <Element2 Type="Type2">Type 2 value</Element2>
        <Element2 Type="Type3">Type 5 value</Element2>    
    </SUB>
    <SUB CLASSNAME = "SUB3">
        <Element1 Type="Star">content 1</Element1>
        <Element2 Type="Henry">Some stuff</Element2>        
    </SUB>
</ROOT>
__XML__

my $xs1 = XML::Simple->new();
my $doc = $xs1->XMLin($xml, keyattr=>['CLASSNAME'], ForceContent=>1, ForceArray=>1);

use Data::Dumper;
local $Data::Dumper::Indent=1;
print Dumper( $doc );

for my $sub ( keys %{ $doc->{SUB} } ){
    print  "Processing $sub\n";
    for my $elem ( keys %{ $doc->{SUB}{$sub} } ){
        print "Processing   $elem\n";
        for my $element ( @{ $doc->{SUB}{$sub}{$elem} } ){
            print "$element Type: $$element{Type}\n";
            print "$element content: $$element{content}\n";
        }
    }
}

__END__

$VAR1 = {
  'SUB' => {
    'SUB3' => {
      'Element2' => [
        {
          'Type' => 'Henry',
          'content' => 'Some stuff'
        }
      ],
      'Element1' => [
        {
          'Type' => 'Star',
          'content' => 'content 1'
        }
      ]
    },
    'SUB2' => {
      'Element2' => [
        {
          'Type' => 'Type2',
          'content' => 'Type 2 value'
        },
        {
          'Type' => 'Type3',
          'content' => 'Type 5 value'
        }
      ],
      'Element1' => [
        {
          'Type' => 'Type1',
          'content' => 'Type 1 value'
        }
      ]
    },
    'SUB1' => {
      'Element2' => [
        {
          'Type' => 'Type2',
          'content' => 'Type 2 value'
        }
      ],
      'Element1' => [
        {
          'Type' => 'Type1',
          'content' => 'Type 1 value'
        }
      ]
    }
  }
};
Processing SUB3
Processing   Element2
HASH(0x1ba4eb4) Type: Henry
HASH(0x1ba4eb4) content: Some stuff
Processing   Element1
HASH(0x1ba4f44) Type: Star
HASH(0x1ba4f44) content: content 1
Processing SUB2
Processing   Element2
HASH(0x1ba4bfc) Type: Type2
HASH(0x1ba4bfc) content: Type 2 value
HASH(0x1ba4c08) Type: Type3
HASH(0x1ba4c08) content: Type 5 value
Processing   Element1
HASH(0x1ba4c8c) Type: Type1
HASH(0x1ba4c8c) content: Type 1 value
Processing SUB1
Processing   Element2
HASH(0x1ba4980) Type: Type2
HASH(0x1ba4980) content: Type 2 value
Processing   Element1
HASH(0x1ba4a10) Type: Type1
HASH(0x1ba4a10) content: Type 1 value