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$VAR1 = {
          'inventors' => 'no content',
...
          'inventor' => 'as array no content',
          'city,country,name,upper-name' => 'content'
        };

{
  'inventors' => {
...
                 'type' => 'array'
               }
};

{
  'inventors' => {
...
                 'type' => 'array'
               }
};

{
  'inventors' => {
...
                      }
               }
};

use Data::Dumper;
use XML::Rules;
...
my $data = $parser->parsefile('c:\temp\inventors.xml');
#print Dumper($data);
print "The 1st inventor was $data->{inventors}{1}{name}\n";