Hello.
We observed a non-deterministic behaviour of the DBpedia SPARQL endpoint. It
gives different results when requesting a query again. E.g. [1]
SELECT DISTINCT * WHERE {
?p <http://purl.org/dc/terms/subject>
<http://dbpedia.org/resource/Category:3._Fu%C3%9Fball-Liga_seasons>.
}
gives 5 results the first time and 3 results after reloading. All of a sudden
it doesn't know <http://dbpedia.org/page/2008%E2%80%9309_3._Fu%C3%9Fball-Liga>
and <http://dbpedia.org/page/2012%E2%80%9313_3._Fu%C3%9Fball-Liga> anymore.
The page for
<http://dbpedia.org/resource/Category:3._Fu%C3%9Fball-Liga_seasons> also
doesn't recognize the inverse relation to the 2008 and 2012 season.
Running [2]
SELECT DISTINCT * WHERE {
?p <http://purl.org/dc/terms/subject>
<http://dbpedia.org/resource/Category:3._Fußball-Liga_seasons>.
}
the first time gives the both former missing (2008 and 2012) seasons. After
reloading the result set is empty.
So it seems it is somehow related to handling of IRIs with non-ascii
characters, maybe in the cache?
Did anybody observed similar? Can someone explain the reason for this and how
to circumvent?
Thanks
Magnus
[1]
http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=PREFIX+rdf%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F1999%2F02%2F22-rdf-syntax-ns%23%3E%0D%0APREFIX+dbo%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%0D%0APREFIX+smm%3A+%3Chttp%3A%2F%2Fpurl.org%2Fhpi%2Fsoccer-voc%2F%3E%0D%0A%0D%0ASELECT+DISTINCT+*+WHERE+%7B%0D%0A+%3Fp+%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Fterms%2Fsubject%3E+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FCategory%3A3._Fu%25C3%259Fball-Liga_seasons%3E.%0D%0A%7D&format=text%2Fhtml&timeout=0&debug=on
[2]
http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=PREFIX+rdf%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F1999%2F02%2F22-rdf-syntax-ns%23%3E%0D%0APREFIX+dbo%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%0D%0APREFIX+smm%3A+%3Chttp%3A%2F%2Fpurl.org%2Fhpi%2Fsoccer-voc%2F%3E%0D%0A%0D%0ASELECT+DISTINCT+*+WHERE+%7B%0D%0A+%3Fp+%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Fterms%2Fsubject%3E+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FCategory%3A3._Fu%C3%9Fball-Liga_seasons%3E.%0D%0A%7D&format=text%2Fhtml&timeout=0&debug=on
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