Matches in ScholarlyData for { <https://w3id.org/scholarlydata/inproceedings/eswc2008/paper/244> ?p ?o. }
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- 244 creator andreas-langegger.
- 244 creator martin-bloechl.
- 244 creator wolfram-woess.
- 244 type InProceedings.
- 244 label "A Semantic Web Middleware for Virtual Data Integration on the Web".
- 244 sameAs 244.
- 244 abstract "In this contribution a system is presented, which provides access to distributed data sources using Semantic Web technology. While it was primarily designed for data sharing and scientific collaboration, it is regarded as a base technology useful for many other Semantic Web applications. The proposed system allows to retrieve data using SPARQL queries, data sources can register and abandon freely, and all RDF Schema or OWL vocabularies can be used to describe their data, as long as they are accessible on the Web. Data heterogeneity is addressed by RDF-wrappers like D2R-Server placed on top of local information systems. A query does not directly refer to actual endpoints, instead it contains graph patterns adhering to a virtual data set. A mediator finally pulls and joins RDF data from different endpoints providing a transparent on-the-fly view to the end-user. The SPARQL protocol has been defined to enable systematic data access to remote endpoints. However, remote SPARQL queries require the explicit notion of endpoint URIs. The presented system allows users to execute queries without the need to specify target endpoints. Additionally, it is possible to execute join and union operations across different remote endpoints. The optimization of such distributed operations is a key factor concerning the performance of the overall system. Therefore, proven concepts from database research can be applied.".
- 244 hasAuthorList authorList.
- 244 hasTopic Collaborative_software.
- 244 hasTopic Data_integration.
- 244 hasTopic SPARQL.
- 244 hasTopic Search_engine.
- 244 hasTopic Semantic_Web.
- 244 isPartOf proceedings.
- 244 keyword "data integration".
- 244 keyword "distributed sparql".
- 244 keyword "semantic web mediator".
- 244 keyword "sparql query processing".
- 244 title "A Semantic Web Middleware for Virtual Data Integration on the Web".