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The error message emitted for missing character encoding should include a link to better explanation of how to specify it correctly. e.g. <http://www.htmlhelp.com/tools/validator/charset.html>.
Done. &iana_charset_blurb() now adds a link to the WDG page on the subject. See <http://dev.w3.org/cvsweb/validator/httpd/cgi-bin/check.diff?r1=1.305.2.30&r2=1.305.2.31&f=h>.