Now showing items 117-136 of 204

  • On the efficiency of joining group patterns in SPARQL queries 

    Sierra, Javier; Polleres, Axel (2010)
    In SPARQL, conjunctive queries are expressed by using shared variables across sets of triple patterns, also called basic graph patterns. Based on this characterization, basic graph patterns in a SPARQL query can be ...
  • On the Ostensibly Silent 'W' in OWL 2 RL 

    Hogan, Aidan; Decker, Stefan (Springer, 2009)
    In this paper, we discuss the draft OWL 2 RL proable from the perspective of applying the constituent rules over Web data. In particular, borrowing from previous work, we discuss (i) optimisations based on a separation ...
  • On The Way to The Web3D: The Applications of 2-Layer Interface Paradigm 

    Jankowski, Jacek; Irzynska, Izabela (2008)
    The use of the Internet for entertainment continues to grow. The success of rich media web portals, such as: YouTube, Flickr, or Google Maps proves that people look for more and more interactive experience on the Web. ...
  • Ontologising Interaction Behavior for Service-Oriented Enterprise Healthcare Integration 

    Sahay, Ratnesh; Fox, Ronan; Hauswirth, Manfred (IEEE, 2008)
  • OWL DL vs. OWL Flight: Conceptual Modeling and Reasoning for the Semantic Web 

    Polleres, Axel; Fensel, Dieter (2005)
    The Semantic Web languages RDFS and OWL have been around for some time now. However, the presence of these languages has not brought the breakthrough of the Semantic Web the creators of the languages had hoped for. OWL has ...
  • Performing Object Consolidation on the Semantic Web Data Graph 

    Hogan, Aidan; Harth, Andreas; Decker, Stefan (2007)
    An important aspect of Semantic Web technologies is the issue of identity and uniquely identifying resources, which is essential for integrating data across sources. Currently, there is poor agreement on the use of ...
  • Personalized Question Answering: A Use Case for Business Analysis 

    Thai, VinhTuan; O'Riain, Sean; Davis, Brian; O'Sullivan, David (2006)
    In this paper, we introduce the Personalized Question Answering framework, which aims at addressing certain limitations of existing domain specific Question Answering systems. Current development efforts are ongoing to ...
  • Podcast Pinpointer: A Multimedia Semantic Web Application 

    Hogan, Aidan; Harth, Andreas; Breslin, John (IEEE, 2005)
    In late 2004, a new method of publishing multimedia broadcasts on the Internet became popular called `Podcasting¿. Podcasting incorporates existing feed description formats, namely RSS 2.0, to ...
  • Previewing Semantic Web Pipes 

    Phuoc, Danh Le; Polleres, Axel; Samwald, Matthias; Tummarello, Giovanni (Springer, 2008)
    In this demo we present a first implementation of Semantic Web Pipes, a powerful tool to build RDF-based mashups. Semantic Web pipes are defined in XML and when executed they fetch RDF graphs on the Web, operate on them, ...
  • Process Mediation Based on Triple Space Computing 

    Zhou, ZhangBing; Sapkota, Brahmananda; Cimpian, Emilia; Foxvog, Doug; Vasiliu, Laurentiu; Hauswirth, Manfred (Springer, 2008)
    Web services are inherently heterogeneous at both data and behavioral levels because of the nature of the Web, which is the main obstacle to the usability of Web services. The heterogeneity at a behavioral level is generally ...
  • Processing ontology alignments with SPARQL 

    Polleres, Axel (IEEE, 2008)
    Solving problems raised by heterogeneous ontologies can be achieved by matching the ontologies and processing the resulting alignments. This is typical of data mediation in which the data must be translated from one ...
  • Processing ontology alignments with SPARQL 

    Polleres, Axel (IEEE Computer Society, 2008)
  • Produce and Consume Linked Data with Drupal! 

    Corlosquet, Stéphane; Delbru, Renaud; Polleres, Axel; Decker, Stefan (Springer, 2009)
    Currently a large number of Web sites are driven by Content Management Systems (CMS) which manage textual and multimedia content but also - inherently - carry valuable information about a site¿s structure and content ...
  • Protect Your RDF Data! 

    Kirrane, Sabrina; Lopes, Nuno; Mileo, Alessandra; Decker, Stefan (2012)
    The explosion of digital content and the heterogeneity of enterprise content sources have pushed existing data integration solutions to their boundaries. Although RDF can be used as a representation format for integrated data, ...
  • A Protégé Plug-in Development to Support the NEPOMUK Representational Language 

    Caires, Milena; Scerri, Simon; Handschuh, Siegfried (2007)
    In this document, we present the challenges faced to develop a plug-in for Protégé that supports requirements for the NEPOMUK1 Representational Language (NRL). NRL is a language built on top of RDF/S and ...
  • A Prototype to Explore Content and Context on Social Community Sites 

    Bojars, Uldis; Heitmann, Benjamin; Oren, Eyal (2007)
    The SIOC Ontology can be used to express information from the online community sites in a machine readable form using RDF. This rich data structure allows us to easily analyse and extract social relations from these ...
  • Quantified equilibrium logic and hybrid rules 

    Polleres, Axel (Springer, 2007)
    In the ongoing discussion about combining rules and Ontologies on the Semantic Web a recurring issue is how to combine first-order classical logic with nonmonotonic rule languages. Whereas several modular approaches to de- ...
  • ReConRank: A Scalable Ranking Method for Semantic Web Data with Context 

    Hogan, Aidan; Harth, Andreas; Decker, Stefan (2006)
    We present an approach that adapts the well-known PageRank/HITS algorithms to Semantic Web data. Our method combines ranks from the RDF graph with ranks from the context graph, i.e. data sources and their linkage. We present ...
  • Relaxing the Basic KR&R Principles to Meet the Emergent Semantic Web 

    Nováček, Vít (CEUR-WS, 2008)
    The paper argues for an alternative, empirical (instead of analytical) approach to a Semantic Web-ready KR&R, motivated by the so far largely untackled need for a feasible emergent content processing.
  • A rule system for querying persistent RDFS data 

    Krennwallner, Thomas; Martello, Alessandra; Polleres, Axel (2009)
    We present GiaBATA, a system for storing, aggregating, and querying Semantic Web data, based on declarative logic programming technology, namely on the dlvhex system, which allows us to implement a fully SPARQL compliant ...