Semantic characterization of data services through ontologies
We study the problem of associating formal semantic descriptions to data services. We base our proposal on the Ontology-Based Data Access paradigm, where a domain ontology is used to provide a semantic layer mapped to the data sources of an organization. The basic idea is to explain the semantics of a data service in terms of a query over the ontology. We illustrate a formal framework for this problem, based on the notion of source-to- ontology (s-to-o) rewriting, which comes in three variants, called sound, complete and perfect, respectively.