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<declaration dd:maxOccur="-1" dd:minOccur="0" dd:nullType="exclude"> 
  <contentDeclaration dd:minOccur="0" dd:nullType="exclude"/>
  <value dd:minOccur="0" dd:nullType="exclude"/>
</declaration>

use strict;
use warnings;
...
my $xml = XMLin('sample.xml');

print Dumper($xml);

$VAR1 = {
          'dd:minOccur' => '0',
...
          'dd:nullType' => 'exclude'
        };