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  1. or download this
    <book:bookResource>
    <book:book>
    <book:meta coverImage="/cover.gif" doi="10.1088" publicationDate="2016
    +-12-01" issn="1111-222X" collectionId="0001">
    ...
    </book:meta>
    </book:bookResource>
    </book:book>
    
  2. or download this
    use XML::LibXML;
    
    ...
            print $book_node->findvalue($book_element);
            }
    }