Ontop is an Ontology Based Data Access system allowing users to access a relational database through a conceptual layer provided by an ontology. In this demo, we use the recently developed NPD benchmark (+4 billion triples) to demonstrate the features of Ontop . First we use Ontop as a SPARQL end-point to load the ontology and mappings, and answer SPARQL queries. Then, we will show how to use O...

—This paper presents an ontology that integrates and provides knowledge related with Learning Objects design, with the intention of supporting the sequencing of learning objects. This ontology was built using an approach based on an ontological engineering methodology and data mining techniques for automatic acquisition of knowledge. The knowledge obtained is represented by the OWL ontology lan...

Clinical trials are required for evaluating new therapies and diagnostic techniques. We developed a system based on OWL and SWRL aimed at suggesting the clinical trials to which a patient could be enrolled, evaluating on real clinical trials and patients from the University Hospital of Rennes. This paper presents the method employed to map the French expressions from the patient data to terms i...

The paper presents a method to include spatial rule within rule languages like SWRL to infer spatial rules within semantic web framework. The concept presented here could benefit both geospatial community as they benefit using the adjusted knowledge base to infer spatial rule and semantic web community as the inclusion of spatial data in its framework adds value to the technology. The methods p...

In this paper we present a technique for recognising location names in non-structured texts. Our approach is based on grammar rules devised for the Italian language and semantic web tools such as geographic linked datasets, OWL ontologies, and SWRL rules, to handle data and reason about them, even in presence of name ambiguities. To the best of our knowledge, this is the first attempt of addres...

AceWiki is a prototype that shows how a semantic wiki using controlled natural language — Attempto Controlled English (ACE) in our case — can make ontology management easy for everybody. Sentences in ACE can automatically be translated into first-order logic, OWL, or SWRL. AceWiki integrates the OWL reasoner Pellet and ensures that the ontology is always consistent. Previous results have shown ...

This paper introduces a semantic framework for adaptive systems. The core is a multidimensional matrix whose different planes contain the ontological representation of different types of knowledge. On these planes we represent user features, her actions, context, device, domain, adaptation goals and methods. The intersection between planes allows us to represent and managing semantic rules for ...

OWL DL corresponds to a Description Logic (DL) that is a fragment of classical first-order predicate logic (FOL). Therefore, the standard methods of automated reasoning for full FOL can potentially be used instead of dedicated DL reasoners to solve OWL DL reasoning tasks. In this paper we report on some experiments designed to explore the feasibility of using existing general-purpose FOL prover...

This paper introduces a semantic framework for adaptive systems. The core is a multidimensional matrix whose different planes contain the ontological representation of different types of knowledge. On these planes we represent user features, her actions, context, device, domain, adaptation goals and methods. The intersection between planes allows us to represent and managing semantic rules for ...