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
>
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>
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