I prefer XML::LibXML for XML processing:

#!/usr/bin/perl

use strict;
use warnings;

use XML::LibXML;

my $file    = shift || die "usage $0 xmlfile";
my $parser  = XML::LibXML->new();
my $doc     = $parser->parse_file( $file );
my $root    = $doc->getDocumentElement;
my @modules = $root->findnodes( '/Product/Module' );

foreach my $module ( @modules ) {
  my $name = $module->findvalue( '@name' );
  print "Module Name: $name\n";
  my @dirs = $module->findnodes( 'SourceDir/@name' );
  foreach my $dir ( @dirs ) {
    print "\t", $dir->value, "\n";
  }
  print "\n";
}
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which produces:

Module Name: nw
        /testnw/nwtool

Module Name: hw
        /prod/hw
        /test/hw
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