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  XMLDecl => 1  or  XMLDecl => 'string'  *# out - handy*
    If you want the output from "XMLout()" to start with the optional 
+XML
...

    If you want some other string (for example to declare an encoding
    value), set the value of this option to the complete string you re
+quire.

use strict;
use warnings;
...
    <numbers>2</numbers>
  </sub_hash>
</opt>