Requesting help with simple MARC::File::XML program

[Anne L. Highsmith]

I have a file of usmarc records which I want to read into a program and print 
to a file as MARC xml. Here's my program so far:

#########################################################
#!/usr/local/bin/perl
use strict;
use warnings;
use MARC::Record;
use MARC::Batch;
use MARC::File::XML;

my $infile = 'updated_dissertation_records';
my $file = MARC::File::XML->out('updated_dissertation_records.xml', 'UTF-8' );

my $batch = MARC::Batch->new( 'USMARC', $infile);
for (my $i = 0; $i < 3; $i++) {
        my $record = $batch->next();
        $file->write($record);
}
#########################################################

First question -- I can't get past the my $file = 
MARC::File::XML->out('updated_dissertation_records.xml', 'UTF-8' );
statement.  When I run the program, that line gets the error:
usage $fh->binmode([LAYER]) at 
/usr/local/perl/5.8/lib/site_perl/5.8.7/MARC/File/XML.pm line 195

Two -- does the "$file->write()" statement expect a MARC::Record object, an XML 
stream, or a marc record string? I've assumed a MARC::Record object. If it 
expects an XML stream, what is the best method for what I'm trying to do to get 
my marc record into an appropriate XML stream?