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  1. or download this
    <book_1>title_1</book1>
    <book_2>title_2</book1>
    
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    use XML::Simple;
    
    ...
    
    my $xml = XMLout(\%xml_hash, KeyAttr => []);
    print $xml;
    
  3. or download this
    <opt>
        <book_1>title_1</book1>
        <book_2>title_2</book1>
    </opt>