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Optimizing query answering under ontological constraints
2011
Proceedings of the VLDB Endowment
Ontological queries are evaluated against a database combined with ontological constraints. Answering such queries is a challenging new problem for database research. For many ontological modelling languages, query answering can be solved via query rewriting: given a conjunctive query and an ontology, the query can be transformed into a first-order query, called the perfect rewriting, that takes into account the semantic consequences of the ontology. Then, for every extensional database D, the
doi:10.14778/3402707.3402737
fatcat:5tno3qzw4bcvthmmsuwzz7frmu