- From: Jeen Broekstra <j.broekstra@tue.nl>
- Date: Thu, 14 Jun 2007 11:12:57 +0200
- To: Jeen Broekstra <j.broekstra@tue.nl>
- CC: andy.seaborne@hp.com, RDF Data Access Working Group <public-rdf-dawg@w3.org>
Jeen Broekstra wrote: > I'm having difficulties with the first test, Nested Optionals 1. [snip] Following up on myself here, I think that this has to do with the fact that the test query's graph pattern is not "well designed" (see Perez et al., section 4.2). This leads to a difference in evaluation results between Sesame's query evaluation approach (which is depth-first) and the compositional approach (which is presumably what the algebra advocates). It might be useful to document this somehow as there are bound to be other depth-first implementations out there that will fail these kinds of patterns. Jeen -- Dr. Jeen Broekstra Den Dolech 2 Information Systems Group HG 7.76 Department of Mathematics and Computer Science P.O. Box 513 Technische Universiteit Eindhoven 5600 MB Eindhoven tel. +31 (0)40 247 36 86 The Netherlands
Received on Thursday, 14 June 2007 09:16:41 UTC