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I have teamed up with Jens-Christian Pokolm (a long time DBA from Postbank Systems, regular presenter at various Oracle conferences) and Denes Kubicek (Oracle ACE and APEX developer of the year, you know him ;).
Jens-Christian covered the Oracle XE part and Denes and me both worked on the APEX parts.
We took a very practical approach writing about the best practices we have developed through the years and many successful projects.
The book is available only in German, sorry ;).
We also provide a website for the book (http://www.apex-xe-praxis.de). How was it built? Certainly we have used Oracle APEX and XE, what else? Proof of concept ;).
Cheers and have a great Christmas,
~Dietmar.