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4.2 Structuring Command Types

The chapter structuring commands fall into four groups or series, each of which contains structuring commands corresponding to the hierarchical levels of chapters, sections, subsections, and subsubsections.

The four groups of commands are the @chapter series, the @unnumbered series, the @appendix series, and the @heading series. Each command produces a title with a different appearance in the body of the document. Some of the commands list their titles in the tables of contents, while others do not. Here are the details:

• The @chapter and @appendix series of commands produce numbered or lettered entries both in the body of a document and in its table of contents.
• The @unnumbered series of commands produce unnumbered entries both in the body of a document and in its table of contents. The @top command, which has a special use, is a member of this series (see The @top Sectioning Command). An @unnumbered section is a normal part of the document structure.
• The @heading series of commands produce simple unnumbered headings that do not appear in a table of contents, are not associated with nodes, and cannot be cross-referenced. These heading commands never start a new page.

When a @setchapternewpage command says to do so, the @chapter, @unnumbered, and @appendix commands start new pages in the printed manual; the @heading commands do not. See @setchapternewpage: Blank Pages Before Chapters.

Here is a summary:

			No new page
Numbered	Unnumbered	Lettered/numbered	Unnumbered
In contents	In contents	In contents	Not in contents
	@top		@majorheading
@chapter	@unnumbered	@appendix	@chapheading
@section	@unnumberedsec	@appendixsec	@heading
@subsection	@unnumberedsubsec	@appendixsubsec	@subheading
@subsubsection	@unnumberedsubsubsec	@appendixsubsubsec	@subsubheading