External DTDs for IE. I have not been able to use external DTDs in Internet Explorer. Someone (who was it? Please remind me) points out that the reason I was getting a Cannot have multiple DOCTYPE declarations error is that the external DTD should not have the enclosing <!DOCTYPE rootElement [ and ]> brackets. (Netscape doesn't complain.)

Disappearing XML. Yihong Zhuang finds that in order for Netscape 6 to display a page properly, there must be at least one property in each of the major selectors. If there is a portion of the XML page that is not covered by any selector, Netscape 6 might not display that section at all.