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MARKSTOS / Test-XML-Valid-0.04 / t / simple_valid.xhtml 
<!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">
<head>
  <title>Subliminal Advertising</title>
</head>

<body>
  <h1>Visit Skatepark.org!</h1>
</body>
</html>