Limited time sale price: DB2 9 for Developers
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DB2 9 for Developers by Philip K. Gunning. From this site, download chapter 4 The Path to DB2 9 XML Capabilities to check out Phil's writing style and the content on XML.
See also the amazon site for this book to see the six 5-star reader reviews for this book.
For details on all of the books that are available for DB2 9.5, see ibm.