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We present the framework of ontology-based data access, a semantic paradigm for providing a convenient and user-friendly access to data repositories, which has been actively developed and studied in the past decade. Focusing on relational data sources, we discuss the main ingredients of ontology-based data access, key theoretical results, techniques, applications and future challenges.doi:10.24963/ijcai.2018/777 dblp:conf/ijcai/XiaoCKLPRZ18 fatcat:vfjvc3sdybdippt5dzppvq2gsq