public function getHTML($header = '', $footer = ''){
		$title = htmlspecialchars($this->label, ENT_QUOTES, 'UTF-8');
		$html = <<<HTML
<html xmlns:epub="http://www.idpf.org/2007/ops">
<head>
<meta charset="UTF-8">
<title>{$title}</title>
{$header}
</head>
<body>
HTML;
		$html .= $this->getNavHTML();
		$html .= <<<HTML
{$footer}
</body>
</html>
HTML;
		return $html;
	}