How can i convert XML to an array of array.

<?xml version="1.0" encoding="UTF-8"?>
<books>
  <!-- Programming Perl 3ed -->
  <book id="1">
    <title>Programming Perl</title>
    <edition>3</edition>
    <authors>
      <author>
        <firstname>Larry</firstname>
        <lastname>Wall</lastname>
      </author>
      
    </authors>
    <isbn>0-596-00027-8</isbn>
  </book>
  <!-- Perl & LWP -->
  <book id="2">
    <title>Perl &amp; </title>
    <edition >1</edition>
    <authors>
      <author>
        <firstname>Sean</firstname>
        <lastname>Burke</lastname>
      </author>
    </authors>
    <isbn>0-596-00178-9</isbn>
  </book>
  <book id="3">
    <!-- Anonymous Perl -->
    <title>Anonymous Perl</title>
    <edition>1</edition>
    <authors />
    <isbn>0-555-00178-0</isbn>
  </book>
</books>
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I can use only XML::Simple,XML::Parser only,while using XML::Simple I was unable to print the data

my $xl=XMLin('C:/perlpractice/dec8.xml',ForceArray=>1);
for$key(keys %$xl)
{
for $s(keys %{$xl{$key}})
{
print $s;
}
}
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Can anyone please help me how to access hashes of hashes with array reference