Search Results for author:
Found 8 papers, 1 papers with code
Integrating 3D City Data through Knowledge Graphs
Moreover, embracing KGs makes it easier to integrate with other spatial data sources, e. g., OpenStreetMap and existing (Geo)KGs (e. g., Wikidata, DBPedia, and GeoNames), and to perform queries combining information from multiple data sources.
INODE: Building an End-to-End Data Exploration System in Practice [Extended Vision]
We demonstrate that our system is uniquely accessible to a wide range of users from larger scientific communities to the public.
Certain Answers to a SPARQL Query over a Knowledge Base (extended version)
More recently, OMQA has been extended to SPARQL queries, but to our knowledge, none of the efforts made in this direction (either in the literature, or the so-called SPARQL entailment regimes) is able to capture both certain answers for UCQs and the standard interpretation of SPARQL over a plain graph.
Enriching Ontology-based Data Access with Provenance (Extended Version)
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.
BigSR: an empirical study of real-time expressive RDF stream reasoning on modern Big Data platforms
The trade-off between language expressiveness and system scalability (E&S) is a well-known problem in RDF stream reasoning.
Data Scaling in OBDA Benchmarks: The VIG Approach
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).
Databases
OBDA Constraints for Effective Query Answering (Extended Version)
In Ontology Based Data Access (OBDA) users pose SPARQL queries over an ontology that lies on top of relational datasources.
Beyond OWL 2 QL in OBDA: Rewritings and Approximations (Extended Version)
Ontology-based data access (OBDA) is a novel paradigm facilitating access to relational data, realized by linking data sources to an ontology by means of declarative mappings.
