This is the first time we've had an appendix in one of the ScanCan articles, so I had to devise a way to encode it (it's a <div type="Appendix"> inside the <back>). This worked out of the box for the XHTML output, but for the PDF it didn't, because the PDF code was not expecting anything there; lots of it was hard-coded for bibliography. Had to tweak two of the XSLT files and do a lot of testing to get the results I wanted.