Date: 2010-09-17 13:02:50
From: senior.ryan-at-gmail.com
I've been testing BigOwlim and the SP^2 Benchmark.  One query that I
consistently get wrong answers on is query 7 from the paper on a dataset
size of 50,000 triples. The paper along with software to generate the
dataset can be found here:
http://dbis.informatik.uni-freiburg.de/index.php?project=SP2B .  The
expected answer is 2 and SwiftOWLIM will give an answer of 2, but BigOWLIM
will give an answer of 131. Could this be a bug in BigOWLIM?  Below is
version information:
BigOWLIM -> 3.3.2264
Sesame -> 2.3.2
SwiftOWLIM -> 3.3.????
I'm not sure how to tell the minor version of Swift, but I believe it's the
officially released version before the most recent.  The query that is
causing the problem is:
PREFIX rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs:    <http://www.w3.org/2000/01/rdf-schema#>
PREFIX foaf:    <http://xmlns.com/foaf/0.1/>
PREFIX dc:      <http://purl.org/dc/elements/1.1/>
PREFIX dcterms: <http://purl.org/dc/terms/>
SELECT DISTINCT ?title
WHERE {
?class rdfs:subClassOf foaf:Document .
?doc rdf:type ?class .
?doc dc:title ?title .
?bag2 ?member2 ?doc .
?doc2 dcterms:references ?bag2
OPTIONAL {
?class3 rdfs:subClassOf foaf:Document .
?doc3 rdf:type ?class3 .
?doc3 dcterms:references ?bag3 .
?bag3 ?member3 ?doc
OPTIONAL {
?class4 rdfs:subClassOf foaf:Document .
?doc4 rdf:type ?class4 .
?doc4 dcterms:references ?bag4 .
?bag4 ?member4 ?doc3
} FILTER (!bound(?doc4))
} FILTER (!bound(?doc3))
}
The dataset size is 50,000 triples.  I generated it using their data set
generator (link to it is above). I can also upload the dataset I generated
and used if it's necessary The Owlim repositories I set up used no
inferencing (the "empty" ruleset).
Let me know if you need any more details.
-Ryan

asked 03 Apr '13, 04:58

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edited 18 Apr '13, 05:58

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Date: 2010-09-20 00:14:17
From: barry.bishop-at-ontotext.com
Hi Ryan,
I'm afraid I've been unable to reproduce this problem. Can you recheck
your configuration, especially making sure that the rule set is indeed
'empty'.
Let me know if you continue to get incorrect results and I will arrange
a later version of BigOWLIM for you to test with.
Best,
barry
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answered 03 Apr '13, 04:58

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edited 18 Apr '13, 05:59

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Asked: 03 Apr '13, 04:58

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Last updated: 18 Apr '13, 05:59

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