Architecture for Including Personalization in a Mobile GIS via Semantic Web Techniques - Geographical Information Systems: Trends and Technologies - page 222

Fig. 2. Diagram of ontologies relationships.
Points of interest ontology
The POI ontology (Fig. 3) contains information about the points of interest.
A point of interest is any spatial element that includes both monuments
and tourist attractions. Some of the POI-related classes have been reused
from other ontologies, such as the SpatialThing class, which comes from the
ontology WGS_84 (W3C 2003). Also, the specialization of POI is based on
the categories of points of interest defi ned in the ontology LinkedGeoData
(Lehmann and Hellmann 2009), facilitating the compatibility of our ontology
with Open Street Maps and Linked Data.
But the defi nition of a POI does not provide interesting information of
the POI to the user. The information related to every single POI that can be
of interest to users is specifi ed by external resources like images, videos,
textual information, maps, etc. These resources provide extra information
to the user, and enhance the travel experience.
Time
According to Gavalas et al. (2013) and Noguera et al. ( 2013) time is one of
the items that should have to be taken into account by future application.
Thus, one of the critical factors in tourism applications is the time factor, it
is necessary to take into account issues such as opening hours of attractions,
calendar aperture, the time to visit, etc. Therefore, it is necessary to have a
representation that facilitates the management of time, dates and schedules.
To store and operate effi ciently with temporary variables, we reused
concepts of TimeOntology. Figure 4 shows a fragment of the ontology
that deals with the description of time and date intervals that are used to
represent a POI schedule. The classes reused from the TimeOntology are
colored in grey in the fi gure.