Hi All,
I have been working on a application in which we would like to find
triples based on a uri (which could be a subject or a blanknode). Subjects
have been working fine, blanknodes have been causing issues.
We work with stardog as graphstore behind the application. In stardog
requesting a blanknode using a Describe and a construct query works fine.
I understand that the implementation of describe varies among
implementations and JENA does not accept a blanknode in a describe query:
DESCRIBE _:b0 and DESCRIBE <_:b0>
Cause:
HTTP 400 error making the query: Bad Request
Using a construct query another issue ruins my idea.
It does not matter how I create the query as a string or using a
ParameterizedSparqlString.
The query which gives the results which I need are given to me by Stardog
using:
CONSTRUCT {<_:b0> ?p ?o} WHERE {<_:b0> ?p ?o}
However I am not able to get this query to the graphstore through JENA.
JENA always parse the query to:
CONSTRUCT
{
_:c0 ?p ?o .
}
WHERE
{ _:b0 ?p ?o }
Which of course gives total different results. How would I be able to get
the right query to the graphstore through JENA?
Met Vriendelijke Groet / With Kind Regards
Nicky van Oorschot
Twitter: @nickyvoorschot
Netage
http://netage.nl
M.A. Reinaldaweg 79
3461AJ Linschoten
tel. +31(0)6-20335266
