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{{ProjectInfo |name=SPARQL Extensions |status=active |type=Research Project |topic=SPARQL |coordinator=Gregory Todd Williams |team=Tetherless World Constellation |abstract=Work on various extensions to allow the use of SPARQL on new types of data and in different environments. }} We have been looking at various extensions to SPARQL (both within the standard SPARQL extension mechanisms and actual extensions to the grammar and/or execution engine) to allow the use of SPARQL in varying contexts. These extensions are built on the [http://search.cpan.org/dist/RDF-Query/ RDF::Query] SPARQL implementation for Perl, and include: * Querying temporal data (tSPARQL grammar extension along with an augmented execution engine to restrict graph pattern matching to temporal intervals) * Querying over distributed SPARQL endpoints (starting from DARQ-style service descriptions, allowing automatic query rewriting for a federated environment and including adaptive techniques to deal with unknown, mis-estimated, or changing selectivities or data rates)
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