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maintaing the order of XML

by thickice97 (Initiate)
on Jan 24, 2008 at 17:13 UTC ( #664085=perlquestion: print w/replies, xml ) Need Help??
thickice97 has asked for the wisdom of the Perl Monks concerning the following question:

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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Re: maintaing the order of XML
by Fletch (Chancellor) on Jan 24, 2008 at 17:19 UTC

    XML::Simple returns the parsed data as a hash and hashes are by definition unordered. If order's important you'll need to step up to a bit more heavyweight solution such as XML::Twig which should preserve the parsed tree in its original order (although accessing an traversal will become a bit more involved, but you should be able to abstract that behind subs fairly easy).

    The cake is a lie.
    The cake is a lie.
    The cake is a lie.

      Does that mean I would need to change the whole code? Or could I use the subroutines for the XML::Twig?
        Does that mean I would need to change the whole code?

        Yes.  It wouldn't make much sense having an XML::Simple, if its disadvantages (in some contexts) wouldn't be outweighed by its somewhat simpler usage.

Re: maintaing the order of XML
by chanio (Priest) on Jan 24, 2008 at 23:25 UTC

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