Global Positioning System Reference
In-Depth Information
she/he likes to visit Romanesque churches with her/his partner (explicit
preferences) but actually she/he never visit Romanesque churches when has
the opportunities and visit soccer stadiums (implicit preferences). Implicit
preferences are easily identifi ed in Fig. 6 since they are represented by
derived (calculated) attributes and relationships and therefore they have a
“/” at the beginning of their name.
Both types of preferences are taken into account to customize user
routes. To fi nd out the implicit preferences of each user, the ontology will
represent historical information of the routes taken by users (Fig. 6).
It is important to note that relationships are established when ontologies
and logical rules are designed. Ontologies already consider the different
possibilities of the user context. What change over time are the values of
such relationships as soon as the system gathers data from user history of
routes. Thus, when the system generates new routes, it takes into account
previously stored data from past users. Opinions and ratings of users are
added as data in the points of interest ontology, and comments are displayed
on the point of interest screen data.
Fig. 6.
Fragment of ontology related to historic routes.
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