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The multiset semantics of SPARQL patterns
Renzo Angles, Claudio Gutierrez · 2016-10-14 · via cs.DB updates on arXiv.org

The paper determines the algebraic and logic structure of the multiset semantics of the core patterns of SPARQL. We prove that the fragment formed by AND, UNION, OPTIONAL, FILTER, MINUS and SELECT corresponds precisely to both, the intuitive multiset relational algebra (projection, selection, natural join, arithmetic union and except), and the multiset non-recursive Datalog with safe negation.

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