title: How to get substring of substring from xml node using xslt
body: <p>How to get  substring of substring from xml node using xslt?</p>
  
  <p>e.g. </p>
  
  <p>input:</p>
  
  <pre><code>&lt;node&gt;This Is W3 School&lt;/node&gt;
  </code></pre>
  
  <p>output:</p>
  
  <pre><code>&lt;node&gt;TIWS&lt;/node&gt;
  </code></pre>
  
  <p>Here, I want to get first letter of each substring separated by space.</p>