if (trim($data)) {
            println($data);
        }
    }
    function process_testpi($data)
    {
        printfln('Processing instruction testpi: %s', $data);
    }
    function unknown_endtag($name)
    {
        println('end: ' . $name);
    }
    function handle_comment($data)
    {
        println($data);
    }
}
$data = '<?xml version="1.0"?>
<div>
	<p>test</p>
	<p>Some more <b>testing</b></p>
	<?testpi This is a processing instruction ?>
	<!-- This is a
	comment -->
	<p>Finally, some more testing.</p>
	Heh.
</div>';
$p = new TestParser();
$p->feed($data);
$p->close();