DARQ is a query engine for federated SPARQL queries. It provides transparent query access to multiple, distributed SPARQL endpoints as if querying a single RDF graph. DARQ enables the applications to see a single query interface, leaving the details of federation to the query engine.
DARQ extends Andy Seaborne’s ARQ (included in Jena)by adding a new query planning algorithm and a modified query execution engine. The work on DARQ includes a service description language and a basic query optimization algorithm.
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