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- W3149559320 abstract "Given the sustained growth that we are experiencing in the number of SPARQL endpoints available, the need to be able to send federated SPARQL queries across these has also grown. To address this use case, the W3C SPARQL working group is defining a federation extension for SPARQL 1.1 which allows for combining graph patterns that can be evaluated over several endpoints within a single query. In this paper, we describe the syntax of that extension and formalize its semantics. Additionally, we describe how a query evaluation system can be implemented for that federation extension, describing some static optimization techniques and reusing a query engine used for data-intensive science, so as to deal with large amounts of intermediate and final results. Finally we carry out a series of experiments that show that our optimizations speed up the federated query evaluation process." @default.
- W3149559320 created "2021-04-13" @default.
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- W3149559320 date "2013-01-01" @default.
- W3149559320 modified "2023-10-03" @default.
- W3149559320 title "Federating Queries in SPARQL1.1: Syntax, Semantics and Evaluation" @default.
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- W3149559320 doi "https://doi.org/10.2139/ssrn.3198993" @default.
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