For each set of mapped concepts, the second level of ontology
mapping compares and matches their property values.
The result of this process helps select appropriate attractions that satisfy the preferences of a tourist. Since out of the
four categories of preferences (tour time, budget, transporta-
tion mode, and activities) preferred activities plays a primary
role in the selection of attractions [28], property compari-
son between the pair of mapped concepts, `preferred activ-
ities' and `provided activities', is discussed rst. Because the
two concepts are both expressed in nominal values,
a Bayesian analysis is used to compare their values. In a
Bayesian analysis, a hypothesis of a concept, presented
as the prior probability (P(H)), represents an initial belief.
Additional evidence (P(ejH)) represents the likelihood of the
hypothesis and is used to update the prior probability to the
posterior probability (P(Hje)) , as in