[redland-dev] How does OPTIONAL work?

[Dave Beckett]

Benno Blumenthal wrote:
> I too had trouble with OPTIONAL (wrote in detail to redland-dev serveral 
> months ago) -- switched to JENA, and the same queries worked fine (and 
> much faster).  Sesame-alpha also supports SPARQL, but I haven't got that 
> working yet.

There are known bugs in OPTIONAL in rasqal, some are fixed in CVS and 
some aren't.  It's mostly been seen when there are OPTIONALs at the end 
of the query, but I've not yet been able to narrow down the problem.

Dave