Access: [13.2.1.1]: Metadata missing
(Priority 2)

Cause:

Metadata should describe or provide specific information about individual web documents. Metadata is commonly used to list keywords so that search engines can conduct a more accurate and refined search. It can also include: content ratings, author information, site maps, stream channel definitions, a document's primary language, and digital library collections.

Testfile:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
	"http://www.w3.org/TR/REC-html40/loose.dtd">
<html lang="en">
<head>
</head>
<body>
</body>
</html>

References:

W3C WAI: http://www.w3.org/WAI//
HTML Techniques for WAI 1.0: http://www.w3.org/TR/WCAG10-HTML-TECHS/