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            #EXPORTABLE FUNCTIONS
    
    ...
    
             #verify the checksum
             if( is_valid_checksum(’01234567’) ) { ... }
    
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    use Business::ISSN qw(is_valid_checksum);
    
    my $issn = '0742-4477';
    print "Valid = " . is_valid_checksum($issn);
    
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    "is_valid_checksum" is not exported by the Business::ISSN module
    Can't continue after import errors at test.pl line 1
    BEGIN failed--compilation aborted at test.pl line 1.