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<a name="compatibility_005falias-1"></a>
<h3 class="section">8.6 <code>compatibility_alias</code></h3>

<p>The keyword <code>@compatibility_alias</code> allows you to define a class name
as equivalent to another class name.  For example:
</p>
<div class="smallexample">
<pre class="smallexample">@compatibility_alias WOApplication GSWApplication;
</pre></div>

<p>tells the compiler that each time it encounters <code>WOApplication</code> as
a class name, it should replace it with <code>GSWApplication</code> (that is,
<code>WOApplication</code> is just an alias for <code>GSWApplication</code>).
</p>
<p>There are some constraints on how this can be used&mdash;
</p>
<ul>
<li> <code>WOApplication</code> (the alias) must not be an existing class;

</li><li> <code>GSWApplication</code> (the real class) must be an existing class.

</li></ul>


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