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The class Activity.(which answers to the question ???What???) refers to sports, such as
skiing, sightseeing or any other activity, such as shopping or visiting a theatre. The
class Organization (which answers to the question ???Where???) refers to the places
where the tourist can carry out an activity. Examples of infrastructure that provide
the means for exerting an activity include restaurants, cinemas, or museums. The
classes Time and Weather (which answers to the question ???When???) refers to the
time and weather conditions which allow a tourist to carry out an activity at a certain
place. The ontologies also include relations which describe the interactions between
concepts or the concept??™s properties. For example, the concepts Fishing and Hiking
are subconcepts of the concept Sport.
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The ontologies also include associative relationships.


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