Lilley, Chris. <a href="http://lists.w3.org/Archives/Member/w3c-ui-tech/2001Mar/0002.html"><cite>Restrictions on identifiers.</cite></a> (forthcoming). W3C Note. URL: <a href="http://lists.w3.org/Archives/Member/w3c-ui-tech/2001Mar/0002.html">http://lists.w3.org/Archives/Member/w3c-ui-tech/2001Mar/0002.html</a>