texinfo: @subsubsection

Chapter Structuring

@part

@unnumberedsubsec @appendixsubsec @subheading

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5.10 '@subsection' and Other Subsub Commands
============================================

The fourth and lowest level sectioning commands in Texinfo are the
'subsub' commands.  They are:

'@subsubsection'
     Subsubsections are to subsections as subsections are to sections.
     (Note: @subsection.)  Subsubsection titles appear in the table of
     contents.

'@unnumberedsubsubsec'
     Unnumbered subsubsection titles appear in the table of contents,
     but lack numbers.  Otherwise, unnumbered subsubsections are the
     same as subsubsections.

'@appendixsubsubsec'
     Conventionally, appendix commands are used only for appendices and
     are lettered and numbered appropriately.  They also appear in the
     table of contents.

'@subsubheading'
     The '@subsubheading' command may be used anywhere that you want a
     small heading that will not appear in the table of contents.

  As with subsections, '@unnumberedsubsubsec' and '@appendixsubsubsec'
do not need to be used in ordinary circumstances, because
'@subsubsection' may also be used within subsections of '@unnumbered'
and '@appendix' chapters (Note: @section).

  In Info, 'subsub' titles are underlined with periods.  For example,

     @subsubsection This is a subsubsection

might produce

     1.2.3.4 This is a subsubsection
     ...............................

  The TeX, HTML, Docbook, and XML output is all analogous to the
chapter-level output, just "three levels down"; Note: @chapter.