Appendixes. The index. Then some information about me, and a colophon. And probably some advertising for other great O'Reilly books.
Seriously, I've covered quite a bit of information at this point. Taking a few days to let the material sink in, and then applying your new XML skills on a project for work or something personal should help you polish your XML knowledge. Soon you'll be an XML wizard, and find your applications' values increasing as they are more flexible, configurable, and productive. Finally, you'll see your value to your boss (and potential bosses at other companies) rise dramatically as you code maintainable and performance-driven applications. Have fun, and stay extensible. I'll see you online.
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