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Facilities are offered to specify different types of rules such
as derivation, transformation, and reaction rules. One very attractive capability is
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the ability to specify queries and inferences on ontologies and mappings between
ontologies. This last feature was the main reason why we have selected RuleML to
model packaging rules. Since our shared global data model is expressed using an
ontology, it makes sense to use a rule modeling language that can express packaging
rules using the concepts present in our e-tourism ontologies. For example, the
sentence, ???renting an AVIS car, class B, costs thirty euros per day,??? is a packaging
rule which is modeled using RuleML in the following way,

renting
AVIS
car
class B
per day
30 euros

A more complex example would be to model the sentence, ???a customer is premium
if he has spent a minimum of 5,000 euros on a travel package.


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