About me

September 2017

Postdoc at the KRDB Research Centre for Knowledge and Data, Faculty of Computer Science, Free University of Bozen-Bolzano, Italy.

My research focuses on Ontology-Based Data Access (OBDA) and related topics such as query optimization and integration of non-relational data sources. I am part of the team that develops the OBDA system Ontop.

Recent publications

  • Expressivity and Complexity of MongoDB Queries. Elena Botoeva, Diego Calvanese, Benjamin Cogrel, and Guohui Xiao. International Conference on Database Theory, 2018.
  • Ontop: Answering SPARQL Queries over Relational Databases. Diego Calvanese, Benjamin Cogrel, Sarah Komla-Ebri, Roman Kontchakov, Davide Lanti, Martin Rezk, Mariano Rodriguez-Muro, and Guohui Xiao. Semantic Web Journal, 2017. (SWJ 2016 Outstanding Paper Award)
  • OBDA Beyond Relational DBs: A Study for MongoDB. Elena Botoeva, Diego Calvanese, Benjamin Cogrel, Martin Rezk, Guohui Xiao. Description Logics, 2016.


Recent talks