43 citations · 89 across the 4 of their papers we have counts for
6 papers
Identifying Notable News Stories
Antonia Saravanou, Giorgio Stefanoni, Edgar Meij
The volume of news content has increased significantly in recent years and systems to process and deliver this information in an automated fashion at scale are becoming increasingl…
Weakly-supervised Contextualization of Knowledge Graph Facts
Nikos Voskarides, Edgar Meij, Ridho Reinanda +5
Knowledge graphs (KGs) model facts about the world, they consist of nodes (entities such as companies and people) that are connected by edges (relations such as founderOf). Facts e…
Estimating the Cardinality of Conjunctive Queries over RDF Data Using Graph Summarisation
Giorgio Stefanoni, Boris Motik, Egor V. Kostylev
Estimating the cardinality (i.e., the number of answers) of conjunctive queries is particularly difficult in RDF systems: queries over RDF data are navigational and thus tend to in…
Answering Conjunctive Queries over Knowledge Bases with Transitive and Reflexive Roles
Giorgio Stefanoni, Boris Motik
Answering conjunctive queries (CQs) over knowledge bases (KBs) with complex role inclusions is PSPACE-hard and in PSPACE in certain cases; however, if complex role i…
Reasoning about Explanations for Negative Query Answers in DL-Lite
Diego Calvanese, Magdalena Ortiz, Mantas Simkus +1
In order to meet usability requirements, most logic-based applications provide explanation facilities for reasoning services. This holds also for Description Logics, where research…
Introducing Nominals to the Combined Query Answering Approaches for EL
Giorgio Stefanoni, Boris Motik, Ian Horrocks
So-called combined approaches answer a conjunctive query over a description logic ontology in three steps: first, they materialise certain consequences of the ontology and the data…