Matches in ScholarlyData for { <https://w3id.org/scholarlydata/inproceedings/eswc2008/paper/168> ?p ?o. }
Showing items 1 to 19 of
19
with 100 items per page.
- 168 creator bastian-quilitz.
- 168 creator ulf-leser.
- 168 type InProceedings.
- 168 label "Querying Distributed RDF Data Sources with SPARQL".
- 168 sameAs 168.
- 168 abstract "Integrated access to multiple distributed and autonomous RDF data sources is a key challenge for many semantic web applications. As a reaction to this challenge, SPARQL, the current W3C Proposed Recommendation for an RDF query language, supports querying of multiple RDF graphs. However, the current standard does not provide transparent query federation, which makes query formulation hard and lengthy. Furthermore, current implementations of SPARQL load all RDF graphs mentioned in a query to the local machine. This usually incurs a large overhead in network traffic, and sometimes is simply impossible for technical or legal reasons. To overcome these problems we present DARQ, an engine for federated SPARQL queries. DARQ provides transparent query access to multiple SPARQL services, i.e., it gives the user the impression to query one single RDF graph despite the real data being distributed on the web. A service description language enables the query engine to decompose a query into sub-queries, each of which can be answered by an individual service. DARQ also uses query rewriting and cost-based query optimization to speed-up query execution. Experiments show that these optimizations significantly improve query performance even when only a very limited amount of statistical information is available. DARQ is available under GPL License at http://darq.sf.net/.".
- 168 hasAuthorList authorList.
- 168 hasTopic Benchmark_%28computing%29.
- 168 hasTopic Data_integration.
- 168 hasTopic Database_management_system.
- 168 hasTopic SPARQL.
- 168 hasTopic Scalability.
- 168 hasTopic Semantic_Web.
- 168 isPartOf proceedings.
- 168 keyword "federated queries".
- 168 keyword "query optimization".
- 168 keyword "query processing".
- 168 keyword "sparql".
- 168 title "Querying Distributed RDF Data Sources with SPARQL".