I know. The first is an example of illegal HTML (at least, illegal as of XHTML 1.0) and the second is an example of nesting, as I mentioned. In the application
is (writing|maintaining) I would personally accept those as acceptable exceptions: neither will screw up more than the poster's message. As I understood it, the biggest problem with leaving open-ended links or otherwise screwing up the HTML was that the rest of the page would be screwed up as well. These two will get rendered as