title: What is on the first line of an XML document?
body: <p>So before we write the XML Schema, a lot of tutorials use this:</p>
  
  <pre><code> &lt;?xml version='1.0'?&gt;
  </code></pre>
  
  <p>or</p>
  
  <pre><code> &lt;?xml version="1.0" encoding="UTF-8" standalone="yes"?&gt;
   &lt;data-set xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"&gt;
  </code></pre>
  
  <p>My question is, what is this part for? What is that website specifically and why do we use it? Are there other methods to do this?</p>
  
  <p>If it helps, I am doing this to convert an excel worksheet into XML. </p>