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Bounded variables not supported in SPARQL queries #1

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dyamon opened this issue Feb 10, 2021 · 0 comments

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dyamon commented Feb 10, 2021 •

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Is seems like bounded variables are not properly handled in SPARQL queries and often lead to wrong answers. Using blank nodes fixes the problem.

An example to reproduce the issue is the following:

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> 
PREFIX ub: <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#> 
SELECT ?X 
WHERE { 
    ?Y ub:member ?X .
    ?Y rdf:type ub:ResearchGroup .
    ?X ub:advisor ?Z .
    ?Z rdf:type ub:AssociateProfessor .
    <http://www.Department0.University0.edu> ub:member ?Z 
}

Changing ?Y, ?Z to _:Y, _:Z respectively solves the issue.

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