by using
  different prefixes, it is not possible to import the same file more
  than once.</p>

<h4>Examples</h4>

<p><i>nested.xml</i> shall be:</p>

<pre>
&lt;project&gt;
  &lt;target name="setUp"&gt;
    &lt;property name="prop" value="in nested"/&gt;
  &lt;/target&gt;

  &lt;target name="echo" depends="setUp"&gt;
    &lt;echo&gt;prop has the value ${prop}&lt;/echo&gt;
  &lt;/target&gt;
&lt;/project&gt;
</pre>

<p>When using import like in</p>

<pre>
&lt;project default="test"&gt;
  &lt;target name="set