I wrote the following code for parsing an xml file. But with this the order is lost as I am using XML simple. What changes can I make for maintaining the order?

use XML::Simple;

my $xml = XMLin('test.xsd');

my $TopLevel = 'DOC';
PrintResults('', $TopLevel);

sub PrintResults {
        my $pre = shift;
        my $start = shift;
        return unless $start;

        $pre .= "." if $pre;
        #print "$pre$start\n";
        my $xml_start = GetNode($start);
        return unless ref($xml_start);

        foreach my $key (keys %$xml_start) {
        if ($key ne "") {
        print "$pre$key\t$xml_start->{$key}->{minOccurs}\t$xml_start->
+{$key}->{maxOccurs}\n";
        }
        # print "$pre$start.$key\n";
        PrintResults("$pre$key", $xml_start->{$key}->{type});
        }
}

sub GetNode {
        my $name=shift;
        #print "Name: $name\n";
        return {$xml->{'xs:complexType'}->{$name}->{'xs:sequence'}->{'
+xs:element'}->{name} => {type=>$xml->{
'xs:complexType'}->{$name}->{'xs:sequence'}->{'xs:element'}->{type}}} 
+if exists($xml->{'xs:complexType'}->{$
name}->{'xs:sequence'}->{'xs:element'}->{name});
        return $xml->{'xs:complexType'}->{$name}->{'xs:sequence'}->{'x
+s:choice'}->{'xs:element'} if exists($
xml->{'xs:complexType'}->{$name}->{'xs:sequence'}->{'xs:choice'}->{'xs
+:element'});
        return $xml->{'xs:complexType'}->{$name}->{'xs:sequence'}->{'x
+s:element'} if exists($xml->{'xs:compl
exType'}->{$name}->{'xs:sequence'}->{'xs:element'});
        return if exists($xml->{'xs:simpleType'}->{$name}->{'xs:restri
+ction'});
        die "Node name not found '$name'\n";
}
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