title: XML file encoding format "utf-8" VS "UTF-8"?
body: <p>When the XML file was convert to ASCII. It is different values for user at the three characters of <code>utf</code> and <code>UTF</code>.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  
  
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  </code></pre>
  
  <p>I tried to create a new xml file with vs2005. <code>utf-8</code> form file generated by default.</p>
  
  <p>which one is a more standard definition?  thanks.</p>