rs:</span></dt><dd><code>state</code> - true for on, false for off, null for no change.</dd></dl>
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<h4>buildStarted</h4>
<pre>public&nbsp;void&nbsp;buildStarted(<a href="../../../../../org/apache/tools/ant/BuildEvent.html" title="class in org.apache.tools.ant">BuildEvent</a>&nbsp;event)</pre>
<div class="block">Signals that a build has started. This event
 is fired before any tar