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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>GNU Texinfo 5.2: Include Files Evolution</title>

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<a name="Include-Files-Evolution"></a>
<div class="header">
<p>
Previous: <a href="Sample-Include-File.html#Sample-Include-File" accesskey="p" rel="previous">Sample Include File</a>, Up: <a href="Include-Files.html#Include-Files" accesskey="u" rel="up">Include Files</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="Evolution-of-Include-Files"></a>
<h3 class="section">20.5 Evolution of Include Files</h3>

<p>When Info was first created, it was customary to create many small
Info files on one subject.  Each Info file was formatted from its own
Texinfo source file.  This custom meant that Emacs did not need to
make a large buffer to hold the whole of a large Info file when
someone wanted information; instead, Emacs allocated just enough
memory for the small Info file that contained the particular
information sought.  This way, Emacs could avoid wasting memory.
</p>
<p>References from one file to another were made by referring to the file
name as well as the node name. (See <a href="Other-Info-Files.html#Other-Info-Files">Referring to
Other Info Files</a>.  Also, see <a href="Four-and-Five-Arguments.html#Four-and-Five-Arguments"><code>@xref</code> with Four and Five Arguments</a>.)
</p>
<p>Include files were designed primarily as a way to create a single,
large printed manual out of several smaller Info files.  In a printed
manual, all the references were within the same document, so TeX
could automatically determine the references&rsquo; page numbers.  The Info
formatting commands used include files only for creating joint
indices; each of the individual Texinfo files had to be formatted for
Info individually.  (Each, therefore, required its own
<code>@setfilename</code> line.)
</p>
<p>However, because large Info files are now split automatically, it is
no longer necessary to keep them small.
</p>
<p>Nowadays, multiple Texinfo files are used mostly for large documents,
such as <cite>The GNU Emacs Lisp Reference Manual</cite>, and for projects
in which several different people write different sections of a
document simultaneously.
</p>
<p>In addition, the Info formatting commands have been extended to work
with the <code>@include</code> command so as to create a single large Info
file that is split into smaller files if necessary.  This means that
you can write menus and cross references without naming the different
Texinfo files.
</p>

<hr>
<div class="header">
<p>
Previous: <a href="Sample-Include-File.html#Sample-Include-File" accesskey="p" rel="previous">Sample Include File</a>, Up: <a href="Include-Files.html#Include-Files" accesskey="u" rel="up">Include Files</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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