Hi,
Here is my query
SELECT ?x ?y WHERE {
?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Student> .
?y <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#Course> .
<http://www.Department0.University0.edu/AssociateProfessor0>
<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#teacherOf> ?y .
?x
<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#takesCourse> ?y
}
When I execute it I get the answer below:
{
"head": {
"vars": [ "x" , "y" ]
} ,
"results": {
"bindings": [
]
}
}
I could not find any valid reason why it returns this answer. I
validated the query using online validator, its absolutely fine.
Then I modify the query.. the query turns into the following:
'SELECT ?x ?y WHERE {?x a ?Student . ?y a ?Course .
?AssociateProfessor0 ?teacherOf ?y . ?x ?takesCourse ?y}'
I left it two days, it did not return anything because the query could
not be parsed. Where did I do mistake if I did any?
I have a few modified queries with single variable worked fine however,
this one did not. I want to believe
the number of variable when is two (X, Y) creating a problem?
For your information, I am using Fuseqi server with TDB store.
Regards,
Rafiq
