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<body lang="en">
<a name="Updating-Requirements"></a>
<div class="header">
<p>
Next: <a href="Other-Updating-Commands.html#Other-Updating-Commands" accesskey="n" rel="next">Other Updating Commands</a>, Previous: <a href="Updating-Commands.html#Updating-Commands" accesskey="p" rel="prev">Updating Commands</a>, Up: <a href="Updating-Nodes-and-Menus.html#Updating-Nodes-and-Menus" accesskey="u" rel="up">Updating Nodes and Menus</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html#Command-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Updating-Requirements-1"></a>
<h4 class="subsection">D.5.2 Updating Requirements</h4>
<a name="index-Updating-requirements"></a>
<a name="index-Requirements-for-updating-commands"></a>

<p>To use the updating commands, you must organize the Texinfo file
hierarchically with chapters, sections, subsections, and the like.
When you construct the hierarchy of the manual, do not &lsquo;jump down&rsquo;
more than one level at a time: you can follow the &lsquo;Top&rsquo; node with a
chapter, but not with a section; you can follow a chapter with a
section, but not with a subsection.  However, you may &lsquo;jump up&rsquo; any
number of levels at one time&mdash;for example, from a subsection to a
chapter.
</p>
<p>Each <code>@node</code> line, with the exception of the line for the &lsquo;Top&rsquo;
node, must be followed by a line with a structuring command such as
<code>@chapter</code>, <code>@section</code>, or
<code>@unnumberedsubsec</code>.
</p>
<p>Each <code>@node</code> line/structuring-command line combination
must look either like this:
</p>
<div class="example">
<pre class="example">@node     Comments,  Minimum, Conventions, Overview
@comment  node-name, next,    previous,    up
@section Comments
</pre></div>

<p>or like this (without the <code>@comment</code> line):
</p>
<div class="example">
<pre class="example">@node Comments, Minimum, Conventions, Overview
@section Comments
</pre></div>

<p>or like this (without the explicit node pointers):
</p>
<div class="example">
<pre class="example">@node Comments
@section Comments
</pre></div>

<p>In this example, &lsquo;Comments&rsquo; is the name of both the node and the
section.  The next node is called &lsquo;Minimum&rsquo; and the previous node is
called &lsquo;Conventions&rsquo;.  The &lsquo;Comments&rsquo; section is within the &lsquo;Overview&rsquo;
node, which is specified by the &lsquo;Up&rsquo; pointer.  (Instead of an
<code>@comment</code> line, you may also write an <code>@ifinfo</code> line.)
</p>
<p>If a file has a &lsquo;Top&rsquo; node, it must be called &lsquo;<samp>top</samp>&rsquo; or &lsquo;<samp>Top</samp>&rsquo;
and be the first node in the file.
</p>
<p>The menu updating commands create a menu of sections within a chapter,
a menu of subsections within a section, and so on.  This means that
you must have a &lsquo;Top&rsquo; node if you want a menu of chapters.
</p>
<p>Incidentally, the <code>makeinfo</code> command will create an Info file for a
hierarchically organized Texinfo file that lacks &lsquo;Next&rsquo;, &lsquo;Previous&rsquo; and
&lsquo;Up&rsquo; pointers.  Thus, if you can be sure that your Texinfo file will be
formatted with <code>makeinfo</code>, you have no need for the update node
commands.  (See <a href="Creating-an-Info-File.html#Creating-an-Info-File">Creating an Info File</a>, for more information about
<code>makeinfo</code>.)
</p>

<hr>
<div class="header">
<p>
Next: <a href="Other-Updating-Commands.html#Other-Updating-Commands" accesskey="n" rel="next">Other Updating Commands</a>, Previous: <a href="Updating-Commands.html#Updating-Commands" accesskey="p" rel="prev">Updating Commands</a>, Up: <a href="Updating-Nodes-and-Menus.html#Updating-Nodes-and-Menus" accesskey="u" rel="up">Updating Nodes and Menus</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html#Command-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
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