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As reported by Jan H. Hapke in <http://lists.w3.org/Archives/Public/www-validator/2003Jun/0169.html>, the "outlines" <ul> and <li>'s aren't valid XHTML. 0.6.1 and 0.6.2b2 have this bug.
Fixed. See <http://dev.w3.org/cvsweb/validator/httpd/cgi-bin/check.diff?r1=1.305.2.57&r2=1.305.2.58&f=h> for details.