Similar to front matter, there is material you might wish to include after your book's final
<chapter> or your article's final
<section>. Possibilities to place in a
<colophon>. There are empty tags you can place into an appendix to generate lists of notation, or lists of particular elements of your choice, such as a list of figures. A similar empty element actually generates the index,
<index-list />. See Section 6.14 for details on the back matter generally, and Section 6.17 for more on automatic lists.