Search Results for author: Giorgio Stefanoni

Found 5 papers, 0 papers with code

Identifying Notable News Stories

no code implementations16 Mar 2020 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 increasingly prevalent.


Answering Conjunctive Queries over $\mathcal{EL}$ Knowledge Bases with Transitive and Reflexive Roles

no code implementations10 Nov 2014 Giorgio Stefanoni, Boris Motik

Moreover, we show that, even for a restricted class of so-called arborescent acyclic queries, CQ answering over $\mathcal{EL}$ KBs becomes NP-hard in the presence of either transitive or reflexive roles.

Reasoning about Explanations for Negative Query Answers in DL-Lite

no code implementations4 Feb 2014 Diego Calvanese, Magdalena Ortiz, Mantas Simkus, Giorgio Stefanoni

In order to meet usability requirements, most logic-based applications provide explanation facilities for reasoning services.

Introducing Nominals to the Combined Query Answering Approaches for EL

no code implementations29 Mar 2013 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; second, they evaluate the query over the data; and third, they filter the result of the second phase to eliminate unsound answers.

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