Wrong: my $cert  = $row->find('/AD/@XREF')->string_value;
    Correct: my $xref  = $row->find('//@XREF')->string_value;

##</code><code>##

print "1-$trans - 2-$cert - 3-$xref - 4-$fname - 5-$lname - 6-$bdate -   
       7-$no - 8-$state - 9-$ssss - 10-$train - 11-$volume - 12-$cno - 
       13-$id - 14-$total\n";