About me
June 2024
CTO and co-founder of Ontopic s.r.l., a spin-off from the Free University of Bozen-Bolzano, Italy. Prior to that, I was a Postdoc at the KRDB Research Centre for Knowledge and Data of this university.
My research focuses on Virtual Knowledge Graphs (VKG) (also known as Ontology-Based Data Access) and related topics such as query optimization and integration of non-relational data sources. I am part of the community that develops the VKG system Ontop.
Some publications
- The Virtual Knowledge Graph System Ontop. Guohui Xiao, Davide Lanti, Roman Kontchakov, Sarah Komla-Ebri, Elem Güzel-Kalayci, Linfang Ding, Julien Corman, Benjamin Cogrel, Diego Calvanese, and Elena Botoeva. International Semantic Web Conference (Resource Track), 2020.
- Virtual Knowledge Graphs: An Overview of Systems and Use Cases. Guohui Xiao, Linfang Ding, Benjamin Cogrel, Diego Calvanese. Data Intelligence, 2019.
- Ontology-based Data Access - Beyond relational sources. Elena Botoeva, Diego Calvanese, Benjamin Cogrel, Julien Corman, Guohui Xiao. Intelligenza Artificiale, 2019.
- Efficient Handling of SPARQL OPTIONAL for OBDA. Guohui Xiao, Roman Kontchakov, Benjamin Cogrel, Diego Calvanese, and Elena Botoeva. International Semantic Web Conference (Research Track), 2018. (slides, extended version, video)
- 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.
Some talks
- Semantically Enhancing OLAP Cubes: Integrating SPARQL and SQL for Next-Generation Data Publication & Business Intelligence. With Adrian Gschwend. Knowledge Graph Forum, May 30, 2024. Basel, Switzerland. (video)
- From Ontop to Ontopic: a virtual-first perspective on knowledge graph construction. Keynote at Knowledge Graph Construction Workshop, May 28, 2023. Hersonissos, Crete, Greece.
- Get more adoption for your KG: SQL access to Virtual KGs in 1 click. Short video at Knowledge Graph Conference, May 12, 2023. Online.
- Designing Virtual Knowledge Graphs with Ontop and Ontopic Studio. Diego Calvanese, Benjamin Cogrel and Davide Lanti. Tutorial at ONTOBRAS, November 24, 2022. Online. (instructions)
- Building a Virtual KG from sensor data using Ontop and the PostgreSQL ecosystem. Knowledge Graph Forum, September 29, 2022. Zurich, Switzerland.
- Federation of relational databases and data lakes with Virtual Knowledge Graphs. Data-Centric Architecture Forum, June 7, 2022. Fort Collins, CO, USA.
- Ontopic Studio: a demo. Short video at Knowledge Graph Conference, May 6, 2022. Online.
- Integrating Data through Virtual Knowledge Graphs with Ontop. Diego Calvanese, Benjamin Cogrel and Guohui Xiao. Tutorial at Knowledge Graph Conference, May 3, 2021. Online. (instructions)
- Accessing Tourism data as a Virtual Knowledge Graph. Software Developers' Thursday, February 6, 2020. Bolzano, Italy.
- Virtual Knowledge Graphs. SFScon, November 16, 2018. Bolzano, Italy.
- Interrogation efficace de bases de données relationnelles avec SPARQL et Ontop. Tutorial (with a screencast). Journées du Développement Logiciel, July 6, 2017. Marseille, France.
- Mapping Management and Expressive Ontologies in Ontology-Based Data Access. Diego Calvanese, Benjamin Cogrel and Guohui Xiao. EKAW 2016 full-day Tutorial, November 19, 2016. Bologna, Italy.
- Ontology-Based Data Access with Ontop. Last lecture of the course Query Answering with Description Logic Ontologies, ESSLLI summer school, August 26, 2016. Bolzano, Italy.
- Introduction to the Ontop framework. Geospatial, Mathematical and Linked Big Data Workshop, European Data Forum, June 28, 2016. Eindhoven, The Netherlands.
- OBDA with Ontop. Erasmus Mundus Master Programme IT4BI, April 22, 2016. Blois, France.
- Accès aux données suivant le principe OBDA avec Ontop. Journées «Ontologies en Sciences Humaines et Sociales», November 9, 2015. Tours, France.
- Interroger efficacement des bases de données relationnelles avec SPARQL et Ontop. SemWeb.Pro, November 5, 2015. Paris, France.