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<book:bookResource xmlns:book="http://api.iop.org/Book/1.0/">
<book:book>
...
</book:contents>
</book:book>
</book:bookResource>

my %book_columns = (
                     'Book_Id' => '@publisherId',
...
                        'Chapter_Id' => '@id',
                        'Chapter_Title' => 'book:locator[contains(@xli
+nk:href, "format=epub")]/@xlink:title',                        
                      );

my $dom = $parser->parse_string(book.xml);
my $root = $dom->documentElement();
...
        print $xpc->findvalue($chapter_columns{$col}, $chapter_node);
    }
}