Hello
I'm working on a sparql query "expander", that is, it add triples and
filters to a query in order to emulate some inference (say you have A -> B
AND C, and a query SELECT * { ?s rdfs:type A }, it would return SELECT * {
?s rdfs:type B. ?s rdfs:type C}).
I'm manipulating sparql queries on the algebra level (using Transformer),
and then I'm returning it as a query, using OpAsQuery. However, not all
algebras can be translated back, specifically, those using SERVICE.
I found this link [1] and decided to execute the algebra directly. However,
the example code in the link has two issues (for what I want):
a) it returns a QueryIterator, not a Resultset.
b) it`s not clear how I specify a remote sparql endpoint.
c) I feel like I would have to rewrite (or clone) some code
So I thought that maybe the best thing for me would be to run my
transformation in the middle of the query execution pipeline.
Is there a way to accomplish that? If not, what you feel as the best way
out (including implementing all stuff missing on OpAsQuery)?
Thanks in advance!
[1]:
http://mail-archives.apache.org/mod_mbox/jena-users/201210.mbox/%[email protected]%3E
--
diogo patrão
