XHTML™

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html 
     PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
  <head>
    <title>Minimal XHTML 1.0 Document with W3C DTD</title>
  </head>
  <body>
    <p>This is a minimal
    <a href="http://www.w3.org/TR/xhtml1/">XHTML 1.0</a> 
    document with a W3C url for the DTD.</p>
  </body>
</html>