Figure 3. Document as Stylesheet
<html xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<head>
<title>Silly Example</title>
</head>
<body>
<h1>Silly Example</h1>
<p>You'd probably use extension elements, or somthing
more interesting in real life: 3+4 is <xsl:value-of select="3+4"/>.
</p>
</body>
</html>