A common problem in this book is a program listing that exceeds the length of the page. Open up the PDF, and you'll see some examples of a program listing that includes a code sample trailing off the edge. Not only is this frustrating to the user, it looks rookie. Fix it.
Write a plugin goal that takes a max char limit and tests every single programlisting and screen element in the DocBook document. If it finds a line that exceeds the lenght it should either:
1. Exit with an error
2. Look for an attribute that would force the tool to wrap the line to a defined maximum