title: How can I get xml argument value in same xml file?
body: <p>My file is like this:</p>
  
  <pre><code>&lt;argument name="a" value=1&gt;
  &lt;argument name="b" value=(there I want to get the value of "a")&gt;
  </code></pre>
  
  <p>how can I get this?</p>