title: Pass output of a target as a value
body: <p>Is it possible to pass the output of an ant target as the value of something else? Such as: </p>
  
  <pre><code>&lt;target name="svnrevision"&gt;
          &lt;exec executable="svnversion" outputproperty="svnversion" /&gt;
      &lt;/target&gt;
  
  &lt;target name="jar"&gt;
          ...
              &lt;manifest&gt;
                  &lt;attribute name="irrelevant" value="${svnversion}"/&gt;
              &lt;/manifest&gt; 
      &lt;/target&gt;
  </code></pre>
  
  <p>Where <code>${svnversion}</code> would be something like 12345.</p>