$hash_ref;

@array1 = "some_unique_key1 some_unique_key2 some_unique_key3";

@array2 = "meta_data_1 metadata_2 metadat_3";

@array3 = "submitted_date1 submitted_date2 submitted_date3";


##</code><code>##

$some_uniquekey1 --> 'Metadata' --> $meta_data1 = '1'
               --> 'Submitted Date' --> $subitted_date1 = '1'

$some_uniquekey2 ... etc


$some_uniquekey3 ... etc