hi,

i'm trying to do some experiments with a SPARQL Service, but
something is not working as expected... at least i'm producing
the longest stacktrace i've seen so far from virtuoso :-)

when i issue this query [1] at this sparqlEndpoint [2]
i get a long stacktrace. in the stacktrace however i'm seeing
this resource http://www.ukat.org.uk/thesaurus/concept/4795 along with it's 
label
which is the resource i'm exptecting to see, so i'm assuming that at least some
parts of the whole workflow are working correctly.

note : this query works on another (openrdf) endpoint as expected.

any pointer or comment really appreciated...

wkr turnguard

[1]

PREFIX tg:<http://schema.turnguard.com/tuqs/1.1/function#>
PREFIX skos:<http://www.w3.org/2004/02/skos/core#>
SELECT * WHERE {
  SERVICE <http://tuqs.semantic-web.at/sparql/UKAT> {
   ?s <http://www.w3.org/2004/02/skos/core#altLabel> ?o 
FILTER(tg:fts(?o,"semantic","en")).
  }
}

[2] http://uriburner.com/sparql

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