You may want to limit the depth of sections that get a section number. If you have deeply nested sections, then the string of numbers in the section label can get quite long. Or perhaps you just want sections at levels 1 and 2 to be numbered, since any lower level sections are not important enough to have a number label.

You can use the section.autolabel.max.depth parameter to control which section levels get a number label. If you set the parameter to 2, then only sections at levels 1 and 2 will have the label. The default value is 8, meaning all section levels have numbering (if it is turned on).

When producing a book, it is sometimes appropriate to group related chapters into book parts. To do that, you use part elements in your book element, and then put your chapter elements inside your part elements. Each part has a title, and may have a title page to indicate a new grouping of chapters.

Numbering of book parts is turned on by default, using uppercase roman numerals. You can turn off part numbering by setting the part.autolabel parameter to zero.

Regardless of whether parts are numbered, you can restart chapter numbering at the beginning of each part. If you want that type of chapter numbering, set the label.from.part parameter to 1. If you use that option, you will probably also want to set the component.label.includes.part.label parameter to 1. That changes the chapter numbering so the chapters in the first part are numbered I.1, I.2, I.3, etc., and the chapters in the second part are numbered II.1, II.2, II.3, etc. If you do not set the second parameter, then your output will have more than one “Chapter 1” and citations and cross references will be ambiguous. The parameter similarly modifies appendix numbers.

If you would rather number your parts using arabic numerals instead of uppercase roman numerals, you can put the number format in the parameter value.

<xsl:param name="part.autolabel">1</xsl:param>

This works for the other autolabel parameters as well.