John is a researcher interested in the evolution of youth unemployment in
different societies; he needs data in the form of RDF data graphs. To do
this, he queries the data graphs available in various Web APIs queried by
the university portal. These scenarios are plausible:
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Scenario 1 - The shape is also important: John needs a representation
that conforms to a specific shape. Therefore, vocabulary negotiation
is not enough because he would have to manually validate all returned
data graphs with the desired vocabularies.
-
Scenario 2 - Flexibility vs rigidity: In scenario 1, the negotiation
can be rigid in case John wants all the constraints to be
valid, and prefers not to have an answer otherwise. Else, the
negotiation can be flexible in case he agrees to receive a
representation even if it does not satisfy all the constraints.
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Scenario 3 - Not all constraints are equally important: For John, not
all shape constraints have the same degree of importance. He therefore
wants a way to express this importance for each constraint and to
obtain the representation that minimizes the violation rate by taking
it into account.