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Issue No. 04 - April (2011 vol. 23)
ISSN: 1041-4347
pp: 638-639
Marcelo Arenas , Pontificia Universidad Católica de Chile, Santigo
Claudio Gutierrez , Universidad de Chile, Santiago
Jorge Pérez , Pontificia Universidad Católica de Chile, Santigo
In the paper, “semQA: SPARQL with Idempotent Disjunction” [4], the authors study the RDF query language SPARQL. In particular, they claim that some of the results presented in [1] are not correct. In this note, we refute the claims made in [4], and actually show that some of the formal results of [4] are incorrect.
RDF, query language, SPARQL, evaluation problem, combined complexity.

J. Pérez, M. Arenas and C. Gutierrez, "Some Remarks on the Paper "semQA: SPARQL with Idempotent Disjunction”," in IEEE Transactions on Knowledge & Data Engineering, vol. 23, no. , pp. 638-639, 2010.
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