The Semantic Web is an extension of the current Web in which information on the Web is given well-defined meaning, better enabling computers and people to work in cooperation. The technical foundation of the Semantic Web is RDF, a semi-structured data model resembling directed labelled graphs. Semantics of data are given by ontologies that are encoded using a specialized vocabulary called RDF S...

The Semantic Web is an extension of the current Web in which information is given well defined meaning, better enabling computers and people to work in cooperation. The technical foundation of the Semantic Web is RDF, a semi-structured data model resembling directed labelled graphs. Semantics of data are given by ontologies that are encoded using a specialized vocabulary called RDF Schema. Firs...

To manage the increasing amount of RDF data, an RDF repository should provide not only necessary scalability and efficiency, but also sufficient inference capabilities. In this paper, we propose a native RDF repository, SystemΠ, to pursue a better tradeoff among the above requirements. System Π takes the hypergraph representation for RDF as the data model for its persistent storage, which effec...

An RDF graph is, at its core, just a set of statements consisting of subjects, predicates and objects. Nevertheless, since its inception practitioners have asked for richer data structures such as containers (for open lists, sets and bags), collections (for closed lists) and reification (for quoting and provenance). Though this desire has been addressed in the RDF primer and RDF Schema specific...

Abstract Automated compliance checking, i.e. the task of automatically assessing whether states affairs comply with normative systems, has recently received a lot attention from scientific community, also as consequence increasing investments in Artificial Intelligence technologies for legal domain (LegalTech). The authors this paper deem crucial research and implementation checkers that can di...

The open source project Edutella is an RDF-based Peer-to-Peer infrastructure for digital resources, focusing on learning materials. Building upon the established meta-data standard RDF(S) appropriate for the description of distributed resources in the World Wide Web WWW, it provides a general RDF-based metadata infrastructure for P2P applications. In this paper, after a short introduction to th...