[Mulgara-general] SPARQL Query question.

[Paul Gearon]

Hmmm, this looks like a parser bug. Let me check it out and get back to you.

Paul

On Thu, Jul 30, 2009 at 3:21 AM, Campbell Allen<campbell.allen at uq.edu.au> wrote:
> Hi,
>
> I am testing out Mulgara for use as a RDF Store / SPARQL end point.  As such
> I am trying to execute a SPARQL query (below) with an OPTIONAL clause in it
> but receive this error (query provided below).   This query works with other
> SPARQL endpoints, so I am hoping you can shed some light on this.
>
> Kindly,
> Campbell.
> --
> Campbell Allen, M.Phil Candidate
> ITEE & Centre for Marine Studies
> University of Queensland
> St Lucia, Brisbane 4072
>
> ----------------------------
> ERROR:
>
>  WARN [main] (Query.java:175) - Failed to find $lon_end in [$actorname,
> $lat, $value, $observation, $characteristic_type, $enddate, $unit, $depth,
> $locname, $lon, $target, $characteristic, $target_type, $measurement,
> $begindate, $instance, $unitsymbol, $datetime, $context, $location, $actor]
> java.lang.IllegalArgumentException: Failed to constrain all variables:
> $lon_end not constrained in WHERE or GIVEN clauses    at
> org.mulgara.query.Query.<init>(Query.java:176)    at
> org.mulgara.sparql.SparqlInterpreter.buildSelectQuery(SparqlInterpreter.java:258)
>    at
> org.mulgara.sparql.SparqlInterpreter.parseQuery(SparqlInterpreter.java:214)
>    at MulgaraTest.queryStore(MulgaraTest.java:259)    at
> MulgaraTest.main(MulgaraTest.java:458) java.lang.NullPointerException    at
> MulgaraTest.queryStore(MulgaraTest.java:278)    at
> MulgaraTest.main(MulgaraTest.java:458) WARN [main] (Query.java:175) - Failed
> to find $end_lon in [$actorname, $lat, $value, $observation,
> $characteristic_type, $enddate, $unit, $locname, $lon, $target,
> $characteristic, $target_type, $measurement, $begindate, $instance,
> $unitsymbol, $datetime, $context, $location, $actor]
> java.lang.IllegalArgumentException: Failed to constrain all variables:
> $end_lon not constrained in WHERE or GIVEN clauses    at
> org.mulgara.query.Query.<init>(Query.java:176)    at
> org.mulgara.sparql.SparqlInterpreter.buildSelectQuery(SparqlInterpreter.java:258)
>    at
> org.mulgara.sparql.SparqlInterpreter.parseQuery(SparqlInterpreter.java:214)
>    at MulgaraTest.queryStore(MulgaraTest.java:259)    at
> MulgaraTest.main(MulgaraTest.java:458)
>
> ------------------------------------------------
> QUERY:
>
>  PREFIX event: <http://maenad.itee.uq.edu.au/metadata/Event#> PREFIX
> spatial: <http://maenad.itee.uq.edu.au/metadata/Spatial#> PREFIX context:
> <http://maenad.itee.uq.edu.au/metadata/Context#> PREFIX temporal:
> <http://maenad.itee.uq.edu.au/metadata/Temporal#> PREFIX physical:
> <http://maenad.itee.uq.edu.au/metadata/Physical#> PREFIX actor:
> <http://maenad.itee.uq.edu.au/metadata/Actor#> PREFIX abstract:
> <http://maenad.itee.uq.edu.au/metadata/Abstract#> PREFIX xsd:
> <http://www.w3.org/2001/XMLSchema#>PREFIX rdf:
> <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs:
> <http://www.w3.org/2000/01/rdf-schema#> SELECT DISTINCT * WHERE {  ?datetime
> temporal:has_datetime ?begindate .  FILTER (?begindate >=
> "2000-01-01T00:00:00"^^xsd:dateTime) .  OPTIONAL { ?datetime
> temporal:has_end_datetime ?enddate .  FILTER (?enddate <=
> "2009-05-31T23:59:59"^^xsd:dateTime) . } .  ?context context:has_datetime
> ?datetime .  ?location spatial:has_longitude ?lon .  ?location
> spatial:has_latitude ?lat .  OPTIONAL { ?location spatial:has_end_longitude
> ?lon_end .                   ?location spatial:has_end_latitude ?lat_end . }
> .  ?context context:has_location ?location .  ?measurement event:has_unit
> ?unit .  ?measurement event:has_value ?value .  ?measurement
> event:has_characteristic ?characteristic_type .  ?instance event:has_actor
> ?actor .  ?instance event:of_target ?target_type .  ?instance
> event:has_context ?context .  ?instance event:has_measurement ?measurement .
>  ?instance rdf:type ?observation .  ?observation rdfs:subClassOf
> event:Observation . }
> _______________________________________________
> Mulgara-general mailing list
> Mulgara-general at mulgara.org
> http://mulgara.org/mailman/listinfo/mulgara-general
>
>