<http://schema.org/keywords>
"Fiction, Action & Adventure, Science-Fiction, Summer Reading, Aliens, Boy's Interest, First Contact, Space Exploration, Social Situations"^^<http://www.w3.org/2001/XMLSchema#string>
<http://books.simonandschuster.com/The-Galaxy-Zack-Collection/Ray-ORyan/Galaxy-Zack/9781481406659>