How can I omit one or more trail list items from the typeset output?
The composer takes advantage of the “invisible stop” markup extension (backtick-fullstop). In normal page display, this is simply removed. However, a number of services, including typeset and page table of contents, ignore any text after an invisible stop. If an author starts a list item with an invisible stop, the composer ignores it. As far as PmWiki is concerned, such items are not on the trail.