path="${ant.project.name}.jar"/&gt;
        &lt;helloworld <b>message="Hello World"</b>/&gt;
    &lt;/target&gt;
</pre>
<p>That's all.</p>

<p>Some background for working with attributes: Ant supports any of these datatypes as
arguments of the set-method:</p><ul>
<li>elementary data type like <i>int</i>, <i>long</i>, ...</li>
<li>its wrapper classes like <i>java.lang.Integer</i>, <i>java.lang.Long</i>, ...</li>
<li><i>java.lang.String</i></li>
<li>some more classes (e.g. <i>java.io.File</i>; see
    <a href