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  use Converter;
  my $document = new Converter;
...
  );
  my $convert_args_hashref = \%convert_args_hash;
  my $status = $document->convert($convert_args_hashref);

  my $status = $document->convert(
    {
...
      'Output' => '[Out file]'
    }
  );

   sub convert {
      my $args_hashref = shift;
      print "The MIME-Type parameter = $args_hashref->{'MIME-Type'}\n"
+;
      ### blah blah ###
   } # end sub convert