KWilt: a semantic patchwork for flexible access to heterogeneous knowledge

Authors:
Klara Weiand;Steffen Hausmann;Tim Furche;François Bry
Affiliations:
Institute for Informatics, University of Munich, München, Germany;Institute for Informatics, University of Munich, München, Germany;Institute for Informatics, University of Munich, München, Germany and Oxford University Computing Laboratory, Oxford, England;Institute for Informatics, University of Munich, München, Germany
Venue:
RR'10 Proceedings of the Fourth international conference on Web reasoning and rule systems
Year:
2010

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Abstract

Semantic wikis and other modern knowledge management systems deviate from traditional knowledge bases in that information ranges from unstructured (wiki pages) over semi-formal (tags) to formal (RDF or OWL) and is produced by users with varying levels of expertise. KWQL is a query language for semantic wikis that scales with a user's level of expertise by combining ideas from keyword query languages with aspects of formal query languages such as SPARQL. In this paper, we discuss KWQL's implementation KWilt: It uses, for each data format and query type, technology tailored to that setting and combines, in a patchwork fashion, information retrieval, structure matching and constraint evaluation tools with only lightweight "glue". We show that it is possible to efficiently recognize KWQL queries that can be evaluated using only information retrieval or information retrieval and structure matching. This allows KWilt to evaluate basic queries at almost the speed of the underlying search engine, yet also provides all the power of full first-order queries, where needed. Moreover, adding new data formats or abilities is easier than in a monolithic system.