title: concatenate XML values with different tag names using dataweave mule
body: <p>We have a scenario where we need to concatenate all XML node values to String.</p>
  
  <p>input XML</p>
  
  <pre><code>&lt;root&gt;
  &lt;Address&gt;
    &lt;line1&gt;1&lt;/line1&gt;
    &lt;line2&gt;2&lt;/line2&gt;
    &lt;line3&gt;3&lt;/line3&gt;
    &lt;line4&gt;4&lt;/line4&gt;
  &lt;/Address&gt;
  &lt;PostCode&gt;
    &lt;line5&gt;5&lt;line5&gt;
  &lt;/PostCode&gt;
  &lt;/root&gt;
  </code></pre>
  
  <p>Output to String</p>
  
  <p>1 2 3 4 5</p>
  
  <p>Please let me know how can i achieve in form of String.</p>
  
  <p>Thanks in advance.</p>