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Ein valides "Hallo Welt"-Dokument

hallo.html : 
<!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="de" >
  <head>
    <title>erstes HTML-Dokument</title>
    <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
  </head>
  <body>
    <p>Hallo Welt!</p>
  </body>
</html>