Given that the two queries have no common variables, wouldn't removing the
optional be more performant? It seems like the optional will create extra
null results for <ANY skos:prefLabel ANY> triple, then do the cross product
with the same query from the other graph. I think that removing the
optional will reduce the number of results in one side of the cross product.
Claude
On Thu, Apr 14, 2016 at 10:57 AM, Mikael Pesonen <mikael.peso...@lingsoft.fi
> wrote:
>
> Thanks, that worked!
>
> Br,
> Mikael
>
>
>
> On 14.4.2016 12:36, Martynas Jusevičius wrote:
>
>> My guess would be that because of SPARQL bottom-up semantics,
>> ?prefLabel is undefined at the point where you are applying it. Try
>> moving it out of OPTIONAL.
>>
>> On Thu, Apr 14, 2016 at 11:11 AM, Mikael Pesonen
>> <mikael.peso...@lingsoft.fi> wrote:
>>
>>> Hi,
>>>
>>> im matching strings in different graphs and this should do the trick:
>>>
>>> SELECT ?prefLabel ?s2
>>> WHERE {
>>> GRAPH <http://www.lingsoft.fi/somegraph>
>>> {
>>> ?s skos:prefLabel ?prefLabel .
>>> }
>>> OPTIONAL {
>>> GRAPH ?graph
>>> {
>>> ?s2 skos:prefLabel ?label2
>>>
>>> FILTER ( lcase(str(?prefLabel)) = lcase(str(?label2)) )
>>> }
>>> }
>>> }
>>>
>>> but im not getting any results. There are plenty of matches in store and
>>> this returns them (case sensitive match)
>>>
>>> SELECT ?prefLabel ?s2
>>> WHERE {
>>> GRAPH <http://www.lingsoft.fi/somegraph>
>>> {
>>> ?s skos:prefLabel ?prefLabel .
>>> }
>>> OPTIONAL {
>>> GRAPH ?graph
>>> {
>>> ?s2 skos:prefLabel ?prefLabel
>>> }
>>> }
>>> }
>>>
>>>
>>> Im I using FILTER wrong way or could it be a bug in search engine?
>>>
>>> Br,
>>> Mikael
>>>
>>> --
>>> www.lingsoft.fi
>>>
>>> Speech Applications - Language Management - Translation - Reader's and
>>> Writer's Tools - Text Tools - E-books and M-books
>>>
>>> Mikael Pesonen
>>> System Engineer
>>>
>>> e-mail: mikael.peso...@lingsoft.fi
>>> Tel. +358 2 279 3300
>>>
>>> Time zone: GMT+2
>>>
>>> Helsinki Office
>>> Eteläranta 10
>>> FI-00130 Helsinki
>>> FINLAND
>>>
>>> Turku Office
>>> Linnankatu 10 A
>>> FI-20100 Turku
>>> FINLAND
>>>
>>>
> --
> www.lingsoft.fi
>
> Speech Applications - Language Management - Translation - Reader's and
> Writer's Tools - Text Tools - E-books and M-books
>
> Mikael Pesonen
> System Engineer
>
> e-mail: mikael.peso...@lingsoft.fi
> Tel. +358 2 279 3300
>
> Time zone: GMT+2
>
> Helsinki Office
> Eteläranta 10
> FI-00130 Helsinki
> FINLAND
>
> Turku Office
> Linnankatu 10 A
> FI-20100 Turku
> FINLAND
>
>
--
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<http://like-like.xenei.com>
LinkedIn: http://www.linkedin.com/in/claudewarren
