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<title>Augment Task</title>
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<h2>Augment</h2>
<p><em>Since Apache Ant 1.8.1</em></p>
<h3>Description</h3>
<p>Modify an existing reference by adding nested elements or (re-)assigning properties mapped as XML
attributes. This is an unusual task that makes use of Ant's internal processing mechanisms to reload
a previously declared reference by means of the <var>id</var> attribute, then treats the
declared <code>augment</code> element as though it were the original element.</p>

<h3>Parameters</h3>
<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>id</td>
    <td>The <var>id</var> of the reference to augment. If no such reference has been declared
      a <code>BuildException</code> is thrown.</td>
    <td>Yes</td>
  </tr>
</table>
<p>Additional permissible attributes are dependent on the reference to be modified.</p>

<h3>Parameters specified as nested elements</h3>

<p>Permissible nested elements are dependent on the reference to be modified.</p>

<h3>Examples</h3>

<p>Given</p>

<pre>&lt;fileset id="input-fs" dir="${basedir}"/&gt;</pre>

<p>invocation</p>

<pre>&lt;augment id="input-fs" excludes="foo"/&gt;</pre>

<p>modifies the <var>excludes</var> attribute of <samp>input-fs</samp>, whereas</p>

<pre>
&lt;augment id="input-fs"&gt;
  &lt;filename name="bar"/&gt;
&lt;/augment&gt;</pre>

<p>adds a <code>filename</code> selector to <samp>input-fs</samp>.</p>

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