Gesellschaft für Informatik e.V.

Lecture Notes in Informatics

INFORMATIK 2008 Beherrschbare Systeme - dank Informatik Band 2 P-134, 718-722 (2008).

Gesellschaft für Informatik, Bonn


Heinz-Gerd Hegering (ed.), Axel Lehmann (ed.), Hans Jürgen Ohlbach (ed.), Christian Scheideler (ed.)

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Semwiq - semantic web integrator and query engine

Andreas Langegger and Wolfram Wöß


One of the most popular applications of Semantic Web technology is the integration of data from distributed locations over the Web. With wrappers, screen scrapers, and information extraction tools it is possible to access, merge, and reason over RDF data from various different, heterogeneous sources. SPARQL can be used to access RDF data in a declarative manner and as will be shown, it can also be used to virtually integrate distributed RDF graphs. In this contribution a mediator-wrapper based middleware is shown which virtually integrates distributed, heterogeneous data sources based on RDF and a slightly modified SPARQL algebra. Schema information available in RDF Schema and OWL vocabularies is used for query federation and optimization. Compared to traditional data integration systems, SemWIQ can fully exploit the semantics of available RDF data. Additionally, RDF has many interesting properties which provide advanced query capabilities based on OWL DL inference.

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Gesellschaft für Informatik, Bonn
ISBN 978-3-88579-228-4

Last changed 04.10.2013 18:18:42