o test for.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if the component instance has been previously registered in this
         configuration context, <code>false</code> otherwise.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../javax/ws/rs/core/Configuration.html#isEnabled-javax.ws.rs.core.Feature-"><code>isEnabled(Feature)</code></a></dd>
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