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<h3 class="section">13.5 Defining New Indices</h3>

<p><a name="index-Defining-new-indices-642"></a><a name="index-Indices_002c-defining-new-643"></a><a name="index-New-index-defining-644"></a><a name="index-defindex-645"></a><a name="index-defcodeindex-646"></a>
In addition to the predefined indices, you may use the
<code>@defindex</code> and <code>@defcodeindex</code> commands to define new
indices.  These commands create new indexing @-commands with which
you mark index entries.  The <code>@defindex</code> command is used like
this:

<pre class="example">     @defindex <var>name</var>
</pre>
  <p>The name of an index should be a two letter word, such as &lsquo;<samp><span class="samp">au</span></samp>&rsquo;. 
For example:

<pre class="example">     @defindex au
</pre>
  <p>This defines a new index, called the &lsquo;<samp><span class="samp">au</span></samp>&rsquo; index.  At the same
time, it creates a new indexing command, <code>@auindex</code>, that you
can use to make index entries.  Use this new indexing command just as
you would use a predefined indexing command.

  <p>For example, here is a section heading followed by a concept index
entry and two &lsquo;<samp><span class="samp">au</span></samp>&rsquo; index entries.

<pre class="example">     @section Cognitive Semantics
     @cindex kinesthetic image schemas
     @auindex Johnson, Mark
     @auindex Lakoff, George
</pre>
  <p class="noindent">(Evidently, &lsquo;<samp><span class="samp">au</span></samp>&rsquo; serves here as an abbreviation for &ldquo;author&rdquo;.)

  <p>In general, Texinfo constructs the new indexing command by
concatenating the name of the index with &lsquo;<samp><span class="samp">index</span></samp>&rsquo;; thus, defining
an &lsquo;<samp><span class="samp">xy</span></samp>&rsquo; index leads to the automatic creation of an
<code>@xyindex</code> command.

  <p>Use the <code>@printindex</code> command to print the index, as you do with
the predefined indices.  For example:

<pre class="example">     @node Author Index
     @unnumbered Author Index
     
     @printindex au
</pre>
  <p>The <code>@defcodeindex</code> is like the <code>@defindex</code> command,
except that, in the printed output, it prints entries in an
<code>@code</code> font by default instead of a roman font.

  <p>You should define new indices before the end-of-header line of a
Texinfo file, and (of course) before any <code>@synindex</code> or
<code>@syncodeindex</code> commands (see <a href="Texinfo-File-Header.html#Texinfo-File-Header">Texinfo File Header</a>).

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