I'm using XML::Simple to read in an XML file, make a change to it, and then output the resulting XML. However, the output isn't formatted quite the way I want it. This is my code:

use XML::Simple;

$xml = XMLin("pre.xml");
$xml->{core}->{test} = 'testeroo';
$res = XMLout($xml);

print $res;
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This is pre.xml:

<config>
<core>
    <variable>ere</variable>
</core>
</config>
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And this is the output:

<opt>
  <core test="testeroo" variable="ere" />
</opt>
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Is there any way to make the result look like:

<opt>
  <core>
    <test>testeroo</test>
    <variable>ere</variable>
  </core>
</opt>
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If not, is there some other module that can make this happen?