Erm, alternatively, if anyone could provide an example of a POI in .gpx format that successfully loads lat, lon, label, description, and category information into Maemo Mapper, that would be a really helpful start. (And does the category have to already exist in Mapper before loading to succeed?).

Update: I found the source of the parsing problem . . . Mapper did not like the stuff in the <gpx> tag, so when that is simplified to "<gpx>", and the <metadata> tag is taken out entirely, Mapper loads it just fine--except for the category. Regardless of whether the category already exists in mapper or not, the <sym> tag gets ignored and the category is set to the "default" category. So if anyone has a suggestion about how to successfully load category from a .gpx file, that would be most appreciated.