Now showing items 21-40 of 43

  • 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, ...
  • Processing ontology alignments with SPARQL 

    Polleres, Axel (IEEE Computer Society, 2008)
  • 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 ...
  • 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 ...
  • 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- ...
  • 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 ...
  • SAOR: Authoritative Reasoning for the Web 

    Hogan, Aidan; Harth, Andreas; Polleres, Axel (Springer, 2008)
    In this paper we discuss the challenges of performing reasoning on large scale RDF datasets from the Web. We discuss issues and practical solutions relating to reasoning over web data using a rule-based approach to ...
  • Scalable Authoritative OWL Reasoning for the Web 

    Hogan, Aidan; Harth, Andreas; Polleres, Axel (2009)
  • Scalable Authoritative OWL Reasoning on a Billion Triples 

    Hogan, Aidan; Harth, Andreas; Polleres, Axel (2008)
    In this paper we present a scalable algorithm for performing a subset of OWL reasoning over web data using a rule-based approach to forward-chaining; in particular, we identify the problem of ontology hijacking: new ...
  • SPARQL++ for mapping between RDF vocabularies 

    Polleres, Axel (Springer, 2007)
    Lightweight ontologies in the formof RDF vocabularies such as SIOC, FOAF, vCard, etc. are increasingly being used and exported by ¿serious¿ applications recently. Such vocabularies, together with query languages like SPARQL ...
  • Towards a social provenance model for the Web 

    Harth, Andreas; Polleres, Axel; Decker, Stefan (2007)
    In this position paper we firstly present the established notion of provenance on the Semantic Web (also referred to as named graphs or contexts), and secondly argue for the benefit of adding to the pure technical notion ...
  • Towards Dataset Dynamics: Change Frequency of Linked Open Data Sources 

    Umbrich, Jürgen; Hausenblas, Michael; Hogan, Aidan; Polleres, Axel; Decker, Stefan (CEUR, 2010)
    Datasets in the LOD cloud are far from being static in their nature and how they are exposed. As resources are added and new links are set, applications consuming the data should be able to deal with these changes. In ...
  • Towards Fine-grained Service Matchmaking by Using Concept Similarity 

    Polleres, Axel (2007)
    Several description frameworks to semantically describe and match services on the one hand and service requests on the other have been presented in the literature. Many of the current proposals for defining notions of ...
  • Towards Intelligent web Services: Web Service Modeling Ontology (WSMO) 

    Polleres, Axel; Fensel, Dieter (Springer, 2005)
    The SemanticWeb and the SemanticWeb Services build a natural application area for Intelligent Agents, namely querying and reasoning about structured knowledge and semantic descriptions of services and their interfaces on ...
  • Weaving the Pedantic Web 

    Hogan, Aidan; Harth, Andreas; Passant, Alexandre; Decker, Stefan; Polleres, Axel (CEUR, 2010)
    Over a decade after RDF has been published as a W3C recommendation, publishing open and machine-readable content on the Web has recently received a lot more attention, including from corporate and governmental bodies; ...
  • Web Service Capabilities and Constraints in WSMO 

    Bussler, Christoph; Polleres, Axel; Zaremba, Michal (2004)
    This paper summarizes the necessities on the semantic modeling of Web Service constraints and capabilities from the viewpoint of the Web Service Modeling Ontology(WSMO) working group. We will give a short motivating use ...
  • What is wrong with Web services Discovery? 

    Fensel, Dieter; Keller, Uwe; Polleres, Axel (2005)
    Various proposals for automating the discovery of Web services are available. Most of them regard the terms service and Web service as synonymous. We believe these two terms are not equivalent and it is relevant to ...
  • What should an ASP solver output? A multiple position paper 

    Polleres, Axel (May, 2007)
    This position paper raises some issues regarding the output of solvers for Answer Set Programming and discusses experiences made in several different settings. The first set of issues was raised in the context of the ...
  • Who the FOAF knows Alice? A needed step towards Semantic Web Pipes 

    Polleres, Axel; Tummarello, Giovanni (2007)
    In this paper we take a view from the bottom to RDF(S) reasoning. We discuss some issues and requirements on reasoning towards effectively building SemanticWeb Pipes, aggregating RDF data from various distributed sources. ...
  • WSML - a Language Framework for Semantic Web Services 

    Polleres, Axel; Fensel, Dieter (2005)
    The Web Service Modeling Language (WSML) provides a framework of different language variants to describe semantic Web services. This paper presents the design rationale and relation with existing language recommendations. ...