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/usr/share/doc/w3c-dtd-xhtml/examples/xhtml-1.0-strict.xml is in w3c-dtd-xhtml 1.2-4.

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The actual contents of the file can be viewed below.

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<?xml version="1.0"?>
<!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">
  <head>
    <title>Testing XHTML 1.0 Strict</title>
  </head>
  <body>
    <p>
      We're just testing stuff from <a
      href="http://www.w3.org/">W3C</a>.</p>
    <p>
      This is indeed a silly little file, name <code
      title="filename">xhtml-1.0-strict.xml</code>.</p>


    <h2>A Table</h2>
    <p>
      Here lies a <em>table</em>:</p>
    <table>
      <caption>Example Table</caption>
      <thead>
        <tr>
          <td>Col A</td>
          <td>Col B</td>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>data a</td>
          <td>data b</td>
        </tr>
      </tbody>
    </table>
  </body>
</html>