Specifies a language associated with a URL. This attribute is not currently used.
lang (AF|AR|AZ|BG|CS|DA|DE|EN|EL|ES|FA|FI|FR|HE|HU|HY|IN|IS|IT|IW|JA|KA|KO|LT|MK|ML|NL|NO|PL|PT|PS|RO|RU|SL|SK|SQ|SR|SV|SW|TH|TR|UK|VI|ZH) #IMPLIED