RDF and the SPARQL query language and protocol provide a standardized way of exposing and linking data sources on the Web [Dod06]. Just as HTML front-ends to existing databases were a key factor in driving widespread adoption of the World Wide Web, RDF front-ends to these data sources will be important in bootstrapping the Semantic Web. We present D2R Server, a system that takes SPARQL queries from the Web and rewrites them to SQL queries via a D2RQ mapping. This on-the-fly translation allows Web access to the content of large databases without the need for replicating them into RDF.
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