Re: [Myexperiment-discuss] Errors in http://rdf.myexperiment.org/sparql

[David R Newman]

Hi All,

I have fixed the bug.

I was improving the sparql endpoint to allow different types of query (i.e. 
select, ask, construct and describe) and had written a function to detect 
the type from the SPARQL query itself. Unfortunately this function wasn't 
robust enough to work in all cases.  I have now amended it so it should be.

Regards

David Newman

--On Tuesday, April 07, 2009 12:49:37 +0100 Alan Williams 
<address@hidden> wrote:

> Hello everybody,
>
> A Taverna user has asked:
>
> <quote>
> It seems that the SPARQL engine changed or doesn't work.
>
> My query is:
>
> PREFIX dcterms: <http://purl.org/dc/terms/>
> PREFIX mebase: <http://rdf.myexperiment.org/ontologies/base/>
> PREFIX snarm: <http://rdf.myexperiment.org/ontologies/snarm/>
> PREFIX sioc: <http://rdfs.org/sioc/ns#>
> PREFIX mevd: <http://rdf.myexperiment.org/ontologies/viewings_downloads/>
> SELECT distinct ?url ?title ?description ?author ?viewed ?downloaded
> where {   ?workflow dcterms:type ?thetype .
> ?workflow dcterms:title ?title .
> ?workflow dcterms:description ?description .
> ?workflow mebase:has-policy ?policy .
> ?workflow mebase:content-url ?url .
> ?workflow sioc:has_owner ?author .
> ?workflow mevd:viewed ?viewed .
> ?workflow mevd:downloaded ?downloaded .
> ?policy snarm:has-access
> <http://rdf.myexperiment.org/ontologies/specific/PublicDownload> .
> FILTER (REGEX(?thetype,'taverna2beta'))
> }
>
> And it worked before.
>
> Now when I paste it and click on "Submit Query", I get:
>
> "ERROR: Could not determine type of query"
>
> When I choose "XML Raw" I get "Transfering data..." and the page hangs
>
> Have you changed anything? How should I adjust my query?
>
> I found out that when I delete "distinct" it works OK, but don't know why
>
> </quote>
>
> Do you know why this happens?
>
> Thanks in advance,
>
> Alan (wearing the Taverna support hat)
>
>
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