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<a name="compatibility_alias"></a>
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<a name="compatibility_005falias"></a>
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Next: <a rel="next" accesskey="n" href="Exceptions.html#Exceptions">Exceptions</a>,
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Previous: <a rel="previous" accesskey="p" href="Constant-string-objects.html#Constant-string-objects">Constant string objects</a>,
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<h3 class="section">8.6 <code>compatibility_alias</code></h3>
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<p>The keyword <code>@compatibility_alias</code> allows you to define a class name
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as equivalent to another class name. For example:
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<pre class="smallexample"> @compatibility_alias WOApplication GSWApplication;
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</pre>
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<p>tells the compiler that each time it encounters <code>WOApplication</code> as
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a class name, it should replace it with <code>GSWApplication</code> (that is,
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<code>WOApplication</code> is just an alias for <code>GSWApplication</code>).
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<p>There are some constraints on how this can be used—
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<ul>
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<li><code>WOApplication</code> (the alias) must not be an existing class;
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<li><code>GSWApplication</code> (the real class) must be an existing class.
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