Querying a Semi-Automated Data Integration System

International audienceA data integration system enables users to query a unified view of data sources through a global schema. We consider a semi-automatically built data integration system in the semantic web context, where data sources are annotated with ontologies. The global schema is also an ontology, expressed in DL-LiteA. After the semi-automated building of the global schema in a previous work, we focus here on the second part of this system, dedicated to the query answering process. We show how it can rely on either GAV or LAV mappings, that are automatically computed. We present algorithms for both cases, and we discuss the properties of this semi-automatically built data integration syste