Architecture for Including Personalization in a Mobile GIS via Semantic Web Techniques - Geographical Information Systems: Trends and Technologies - page 224

Fig. 4. Fragment of ontology related to the time dimension of points of interest.
A user can defi ne preferences according to: 1) his/her interests in the
type of POI to visit, 2) the expected duration of visits, 3) his/her economic
restrictions, 4) the preferred visiting zone, 5) the size of the area to cover
per visit, and 6) the users' companion, that is, if he/she is traveling with
children, friends, pets or people with disabilities. Furthermore, the system
also lets to set composite preferences, combining two or more different
types of preferences (including composites). This would allow representing
things like “when I travel alone I like to visit historical POIs, but when I go
with children I prefer to go to infantile or zoo points of interest and fi nish
the route before 5 pm.” These composite preferences are specifi ed by the
concept CompositePreference .
The ontology allows representing explicit and implicit preferences.
Explicit preferences are those entered into the system by the user. Implicit
preferences are automatically extracted by analyzing all the routes
performed by each user (both automatically and manually). Explicit
preferences may be seen as what the user thinks, he or she likes and implicit
preferences as what the user really likes. For example, someone may say that