Hello all,
I am using TopBraid Composer version 3.5.0 in Ubuntu 11.04. I am trying to
execute the following SPARQL query, but I have found that when all four BIND
operations are included, the query returns an empty result set.
SELECT ?x
WHERE {
?arg1 ns:has_agent ?agent .
{
?agent rdfs:subClassOf ?agent_type .
}
UNION
{
?agent rdf:type ?agent_type .
} .
BIND (IF((?agent_type = <http://bio2rdf.org/chebi:36080>), 1, 0) AS ?x) .
#bind number 1
BIND (IF((?agent_type = <http://bio2rdf.org/so:0000236>), -1, 0) AS ?x) .
#bind number 2
BIND (IF((?agent_type = <http://bio2rdf.org/chebi:33697>), 1, 0) AS ?x) .
#bind number 3
BIND (IF((:subClassAskQuery(?agent_type, <http://bio2rdf.org/chebi:24431>) =
true), 1, 0) AS ?x) . #bind number 4
}
:subClassAskQuery is the following:
ASK WHERE {
?arg1 (rdfs:subClassOf)* ?arg2 .
}
Strangely, when only bind operations #1 and #4 or bind operations #1-3 are
included, the query returns results. The problem seems to be when I combine
bind operations #(2, 3 and 4) or (2 and 4) or (3 and 4) -- the result set is
empty.
In other queries, I have used multiple bind operations with no problems.
Has anyone else experienced this? Any help is much appreciated!
Thanks,
Alison
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