Hi Carsten,
I have been able to recreated this issue and reported to development to look
into ...
Best Regards
Hugh Williams
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On 11 Jul 2014, at 09:38, Carsten Keßler <m...@carsten.io> wrote:
> Dear all,
>
> I'm running Virtuoso OS 7.1.0 and trying to run some federated queries to
> DBpedia and Europeana. Here's an example of what I'm trying to do (fetch some
> Europeana artifacts created during the lifetime of Ghandi, as a simplified
> example):
>
> prefix db: <http://dbpedia.org/ontology/>
> prefix dc: <http://purl.org/dc/elements/1.1/>
> prefix xsd: <http://www.w3.org/2001/XMLSchema#>
>
> SELECT * WHERE {
>
> SERVICE <http://dbpedia.org/sparql> {
> <http://dbpedia.org/resource/Mahatma_Gandhi> db:birthDate
> ?birth ;
> db:deathDate ?death .
>
> }
>
> SERVICE <http://europeana.ontotext.com/sparql> {
> SELECT * WHERE {
> ?artifact dc:date ?date .
> FILTER ( ?date >= xsd:string(?birth) && ?date <=
> xsd:string(?death) )
> } LIMIT 10
> }
>
> } LIMIT 10
>
> If I run this through the sparql.org endpoint, it works without problems [1].
> Virtuoso gives me the following error, though:
>
> Virtuoso 37000 Error SP031: SPARQL compiler: Variable 'birth' is used in the
> query result set but not assigned
> Is this a know limitation of Virtuoso?
>
> Thanks,
> Carsten
>
>
> [1]
> http://sparql.org/sparql?query=prefix+db%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%0D%0Aprefix+dc%3A+%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Felements%2F1.1%2F%3E%0D%0Aprefix+xsd%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2001%2FXMLSchema%23%3E%0D%0A%0D%0ASELECT+*+WHERE+%7B%0D%0A%0D%0A%09SERVICE+%3Chttp%3A%2F%2Fdbpedia.org%2Fsparql%3E+%7B+%0D%0A%09%09+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FMahatma_Gandhi%3E+db%3AbirthDate+%3Fbirth+%3B%0D%0A+++++++++++++++++++++++++++++db%3AdeathDate+%3Fdeath+.%0D%0A%0D%0A%09%7D%0D%0A%0D%0A+++++++SERVICE+%3Chttp%3A%2F%2Feuropeana.ontotext.com%2Fsparql%3E+%7B+%0D%0A++++++++++++SELECT+*+WHERE+%7B%0D%0A%09%09%3Fartifact+dc%3Adate+%3Fdate+.%0D%0A%09%09FILTER+%28+%3Fdate+%3E%3D+xsd%3Astring%28%3Fbirth%29+%26%26+%3Fdate+%3C%3D+xsd%3Astring%28%3Fdeath%29+%29++%09%0D%0A+++++++++++%7D+LIMIT+10%09%0D%0A%09%7D%0D%0A++++++++%0D%0A%7D+LIMIT+10&default-graph-uri=http%3A%2F%2Fdbpedia.org%2Fdata%2FMahatma_Gandhi.rdf&output=text&stylesheet=%2Fxml-to-html.xsl
> ------------------------------------------------------------------------------
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