title: Correct syntax for a multi line comment in xml?
body: <p>Can i write a multi line comment in an xml file as follows ? I some text editors it displays it as greyed out (as it should for a comment) and in other text editors ive tried it in it colours the multi line text in white showing it dosnt know what it is ? </p>
  
  <p>If this isnt the correct syntax for a multi line comment, what is ?</p>
  
  <pre><code>&lt;!--CUSTOM BLOCK START--&gt;
  &lt;!--
      Have set : 
      - command 1 fires (no response required)
      - wait 3000ms
      - command 1 repeat fires 
  --&gt;
  </code></pre>