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In ontology-based data access (OBDA), an ontology is connected to autonomous, and generally pre-existing, data repositories through mappings, so as to provide a high-level, conceptual view over such data. User queries are posed over the ontology, and answers are computed by reasoning both on the ontology and the mappings. Query answering in OBDA systems is typically performed through a query rewriting approach which is divided into two steps: (i) the query is rewritten with respect to thedoi:10.1145/2452376.2452441 dblp:conf/edbt/PintoLLMPRRS13 fatcat:molmzmjjubb2llkebwqbtijvou