Search Results for author: Davide Lanti

Found 6 papers, 1 papers with code

Mapping Patterns for Virtual Knowledge Graphs

no code implementations3 Dec 2020 Diego Calvanese, Avigdor Gal, Davide Lanti, Marco Montali, Alessandro Mosca, Roee Shraga

Virtual Knowledge Graphs (VKG) constitute one of the most promising paradigms for integrating and accessing legacy data sources.

Knowledge Graphs

Counting Query Answers over a DL-Lite Knowledge Base (extended version)

no code implementations12 May 2020 Diego Calvanese, Julien Corman, Davide Lanti, Simon Razniewski

Counting answers to a query is an operation supported by virtually all database management systems.

Enriching Ontology-based Data Access with Provenance (Extended Version)

no code implementations1 Jun 2019 Diego Calvanese, Davide Lanti, Ana Ozaki, Rafael Penaloza, Guohui Xiao

In particular, we investigate the problems of (i) deciding whether a provenance annotated OBDA instance entails a provenance annotated conjunctive query, and (ii) computing a polynomial representing the provenance of a query entailed by a provenance annotated OBDA instance.

Data Scaling in OBDA Benchmarks: The VIG Approach

1 code implementation21 Jul 2016 Davide Lanti, Guohui Xiao, Diego Calvanese

The advantage of the approach is that the user is not required to manually input the characteristics of the data to be produced, making it particularly suitable for OBDA benchmarks, where the complexity of database schemas might pose a challenge for manual input (e. g., the NPD benchmark contains 70 tables with some containing more than 60 columns).


OBDA Constraints for Effective Query Answering (Extended Version)

no code implementations13 May 2016 Dag Hovland, Davide Lanti, Martin Rezk, Guohui Xiao

In Ontology Based Data Access (OBDA) users pose SPARQL queries over an ontology that lies on top of relational datasources.


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