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Ontology Based Data Access (OBDA) is a recently proposed approach which is able to provide a conceptual view on relational data sources. It addresses the problem of the direct access to big data through providing end-users with an ontology that goes between users and sources in which the ontology is connected to the data via mappings. We introduced the languages used to represent the ontologies and the mapping assertions technique that derived the query answering from sources. Query answeringdoi:10.17977/um018v3i22020p67-76 doaj:b02bb868a28c49738fc9e70ed8a5a3ba fatcat:att3mdcl6fe4zpukt3hriabksa