type=boat, hotel, individual, organized — indicates the type of this part of the diving holiday. Here, boat indicates a liveaboard, hotel a stay at a hotel, individual means that the divers planned this holiday themselves, whereas organized indicates a holiday booked at a tour operator. The individual keywords can be combined, too. Then they are to be divided by commas.
Inside <trippart> all information concerning a certain "part" of diving holiday are given. In case the diving holiday consists of several "parts", for example a boat trip and a stay at a hotel, then any number of <trippart> sections may appear consecutively inside <trip>.
If the <trip> section is given, at least one <trippart> section must occur, too.