Assuming you don't also have real appendixes, I believe <appendix> would
work for that. You'd have to customize the xsls so the generated text
for appendix is Interlude (in the same way you'll change "Part" to
"Section") and to get the desired numeration style.
David
> The ToC looks something like this:
> (Taken from: http://www.xp123.com/rwb/)
> --------------------------------------
> Preface
> Chapter 1 - Roadmap
>
> Section 1 - Smells Within Classes
> Chapter 2 - The Refactoring Cycle
> Chapter 3 - Measured Smells
> Interlude 1 - Smells and Refactorings
>
> Chapter 4 - Names
> Chapter 5 - Unnecessary Complexity
> Interlude 2 - Inverses
>
> Chapter 6 - Duplication
> ....
> --------------------------------------
> ('Sections' there seem to be what 'parts' are in Docbook, but
> that doesn't really matter here.)
