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<title>AntStructure Task</title>
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<h2 id="antstructure">AntStructure</h2>
<h3>Description</h3>

<p>Generates an DTD for Apache Ant buildfiles which contains information about all tasks currently
known to Ant.</p>

<p>Actually the DTD will not be a real DTD for buildfiles since Ant's usage of XML cannot be
captured with a DTD.  Several elements in Ant can have different attribute lists depending on the
element that contains them. <a href="fail.html"><code>&lt;fail&gt;</code></a> for example can be a
task or a nested child element of the <a href="../Tasks/sound.html"><code>&lt;sound&gt;</code></a>
task.  Don't consider the generated DTD something to rely upon.</p>

<p>Also note that the DTD generated by this task is incomplete, you can always add XML entities
using <a href="taskdef.html"><code>&lt;taskdef&gt;</code></a>
or <a href="typedef.html"><code>&lt;typedef&gt;</code></a>.
See <a href="https://web.archive.org/web/20071231061243/http://www.sdv.fr/pages/casa/html/ant-dtd.en.html"
target="_top">here</a> for a way to get around this problem.</p>
<p>This task doesn't know about required attributes, all will be listed
as <code>#IMPLIED</code>.</p>

<p><em>Since Ant 1.7</em> custom structure printers can be used instead of the one that emits a DTD.
In order to plug in your own structure, you have to implement the
interface <code class="code">org.apache.tools.ant.taskdefs.AntStructure.StructurePrinter</code>
and <code>&lt;typedef&gt;</code> your class and use the new type as a nested element of this
task&mdash;see the example below.

<h3>Parameters</h3>
<table class="attr">
  <tr>
    <th>Attribute</th>
    <th>Description</th>
    <th>Required</th>
  </tr>
  <tr>
    <td>output</td>
    <td>file to write the DTD to.</td>
    <td>Yes</td>
  </tr>
</table>
<h3>Examples</h3>
<pre>&lt;antstructure output=&quot;project.dtd&quot;/&gt;</pre>

<p><strong>Emitting your own structure instead of a DTD</strong></p>

<p>First you need to implement the interface</p>

<pre>
package org.example;
import org.apache.tools.ant.taskdefs.AntStructure;
public class MyPrinter implements AntStructure.StructurePrinter {
    ...
}</pre>

<p>and then use it via typedef</p>

<pre>
&lt;typedef name="myprinter" classname="org.example.MyPrinter"/&gt;
&lt;antstructure output="project.my"&gt;
  &lt;myprinter/&gt;
&lt;/antstructure&gt;</pre>

<p>Your own StructurePrinter can accept attributes and nested elements just like any other Ant type
or task.</p>

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