Ok, I will not be able to reproduce this problem. I reloaded the same
rdf file and the
problem disappeared. No idea what caused this. It could be that I mixed
isql versions
for loading the RDF into Virtuoso.
So this is probably not a bug. Sorry.
Lourens
Lourens van der Meij wrote:
I am still trying to find out exactly under what conditions the problem
occurs:
Blank node values sometimes get returned as NULL values.
e.g. in
isql
sparql select * where {?o1
<http://knowledgeweb.semanticweb.org/heterogeneity/alignment#entity1>
<http://brinkman.kb.nl/btr/075609983>};
returns
o1
VARCHAR
---------
NULL
NULL
NULL
with the latest virtuoso 5.0.12.
An earlier (5.0.12pre) version (with its own database) did return
nodeID://b10001 values
as expected.
I havent been able to reduce this to some trivial test yet.
Before I do that, is there some known issue in the latest 5.0.12 which
could lead
to the above behavior?
This is a stopper for me as I use retrieval of construct values through
the sesame interface
where the NULL values returned lead to an assertion error.
Thanks,
Lourens
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