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use Class::Utils qw(set_params);
use English;
use Error::Pure qw(err);
use Getopt::Std;
use List::Util 1.33 qw(none);
use MARC::File::XML (BinaryEncoding => 'utf8', RecordFormat => 'MARC21');
use MARC::Record::Stats;
use Readonly;
use Unicode::UTF8 qw(encode_utf8);

Readonly::Array our @INPUT_FORMATS => qw(xml);

our $VERSION = 0.01;

# Constructor.
sub new {
	my ($class, @params) = @_;

	# Create object.
	my $self = bless {}, $class;

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		print STDERR "Usage: $0 [-h] [-i format] [--version] marc_file\n";
		print STDERR "\t-h\t\tPrint help.\n";
		print STDERR "\t-i format\tInput MARC format. Possible formats is xml (default values is xml).\n";
		print STDERR "\t--version\tPrint version.\n";
		print STDERR "\tmarc_file\tMARC file.\n";
		return 1;
	}
	$self->{'_marc_file'} = shift @ARGV;

	# Check output format.
	if (none { $self->{'_opts'}->{'i'} eq $_ } @INPUT_FORMATS) {
		err "Input format '$self->{'_opts'}->{'i'}' doesn't supported.";
	}

	my $stats = MARC::Record::Stats->new;

	my $marc_file;
	if ($self->{'_opts'}->{'i'} eq 'xml') {
		$marc_file = MARC::File::XML->in($self->{'_marc_file'});
		if (! defined $marc_file) {
			err 'Cannot create object for MARC file.';