Authors:    Xiao, G., Lanti, D., Kontchakov, R., Komla-Ebri, S., Güzel-Kalaycı, E., Ding, L., … & Botoeva, E.

Published in:   The 33rd International Workshop on Description Logics

Abstract:   The Virtual Knowledge Graph (VKG) approach, also known in the literature as Ontology-Based Data Access (OBDA) [8,12], has become a popular paradigm for accessing and integrating data sources [13]. In such approach, the data sources, which are normally relational databases, are virtualized through a mapping and an ontology, and presented as a unified knowledge graph, which can be queried by end-users through a vocabulary they are familiar with. At query time, a VKG system translates user queries over the ontology to SQL queries over the database. This approach frees end-users from the low-level details of data organization, so that they can concentrate on their high-level tasks. As it is gaining more importance, the VKG paradigm has been implemented in several systems [1,2,9,11] and adopted in a wide range of use cases. Here, we present the latest major release,Ontopv4, of a popular VKG system.

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