title: to delete the value of the element in XML using xmlstarlet
body: <p>I'm trying to delete the value of the element in the xml using xmlstarlet:
  I tried xmlstarlet ed -d command to delete the value but it did not work.
  I also tried using xmlstarlet ed -u to replace the value 123 with ""(null). This did not work either.</p>
  
  <p>Can someone please help me how to get this:
  Input:</p>
  
  <pre><code>&lt;?xml version="1.0"?&gt;
  &lt;List Name="myList"&gt;
    &lt;Dir Path="abc"&gt;123&lt;/Dir&gt;
    &lt;Dir Path="cde"&gt;456&lt;/Dir&gt;
    &lt;File Path="xyz"&gt;789&lt;/File&gt;
    &lt;File Path="xxx"&gt;567&lt;/File&gt;
  &lt;/List&gt;
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>&lt;List Name="myList"&gt;
    &lt;Dir Path="abc"&gt;&lt;/Dir&gt;
    &lt;Dir Path="cde"&gt;&lt;/Dir&gt;
    &lt;File Path="xyz"&gt;&lt;/File&gt;
    &lt;File Path="xxx"&gt;&lt;/File&gt;
  &lt;/List&gt;
  </code></pre>
  
  <p>I want to delete the values "123", "456" ...</p>
  
  <p>Thanks in advance</p>