title: Set a property inside one ant target and use it in another target
body: <p>My build file is</p>
  
  <pre><code>&lt;target name="default"&gt;  
   &lt;antcall target="child_target"/&gt;  
   &lt;echo&gt; ${prop1}   &lt;/echo&gt;  
  &lt;/target&gt;
  
  &lt;target name="child_target"&gt;  
   &lt;property name="prop1" value="val1"/&gt;   
  &lt;/target&gt;
  </code></pre>
  
  <p>I get an error that <code>${prop1}</code> has not been set. How do I set a property in the target?</p>