I have a set of classes and properties for the actual records for the four standard Palm databases.
The vocabulary of RDF classes and properties in your notes is up to you. I have a few: geographic location, related address book entries, hotel in the address book, related URI, photo URI, birthday date book entries, etc.
I also have a set for itineraries: departure and arrival airports, airlines flight numbers, etc.
I plan to add more for genealogy data.