title: Unable to understand Mule 3 expressions
body: <p>I know Mule 4 but came across Mule 3 application and trying to understand some expressions and connectors. Can somebody explain.</p>
  <p>Set Variable expression 1:</p>
  <pre><code>#[dw(&quot;p(flowVars.someKey)&quot;)]
  </code></pre>
  <p>Set Variable expression 2: (input XML payload)</p>
  <pre><code>#[xpath3('local-name(//*:Body/*[1])')]
  </code></pre>
  <p>What does DOM to XML do?</p>