Hi all, I am writing a blog post on this very subject (adding reasoning capabilities to Fuseki datasets and more) and I got a similar behaviour when updating a named graph. I've also used all the supported reasoners.
My solution is kind of intermediate: creating an RDFDataset with a default graph that reasons on the special union graph, then several named graphs containing my data, each one with its (named) inference graph. In this way it's possible to add triples to the named inference graphs (as Andy suggested too) and have them reasoned upon in real time, plus the default graph can reason cross-graph (but it can only be updated with a restart anyway). I know it's not ideal, but it can probably get what you need. I'll add more details as I put things together. @Andy: it would be nice if a dataset "reload" was supported via API as the change of state (active/offline) is. Any thoughts on this? Any comments are welcome. Nicola On 2020/04/29 08:08:43, Andy Seaborne <[email protected]> wrote: > Sascha, > > (aside) > For my general understanding: > What level of reasoning are you and your student interested in having? > > There is a tradeoff between inference expressiveness, performance (CPU > and RAM costs), how much development effect it would take for future > improvements. > > On 29/04/2020 08:18, Meckler, Sascha wrote: > > Hello Andy and Marco, > > > > the problem also applies to built-in reasoners. > > I tried Jena's OWLFBRuleReasoner, OWLMicroFBRuleReasoner and the > > RDFSExptRuleReasoner. > > (See demo project: > > https://github.com/smeckler/inference-demo/blob/master/src/main/resources/fuseki/config.ttl) > > Each of which has some forward rules. > > If you want to update the inference graph, send updates to the inference > graph. > > Andy > > > > > Thank you for your help! > > Best regards, > > Sascha > > > > > >> -----Original Message----- > >> From: Marco Neumann <[email protected]> > >> Sent: Tuesday, April 28, 2020 7:12 PM > >> To: [email protected] > >> Subject: Re: Fuseki inference not triggered with incoming data > >> > >> so Sascha in short try to use one of the Jena build-in reasoners if this is > >> not bound to a pellet specific task. if it is you will have to bring this > >> request up with the pellet maintainers. > >> > >> On Tue, Apr 28, 2020 at 5:20 PM Andy Seaborne <[email protected]> wrote: > >> > >>> > >>> > >>> On 27/04/2020 09:49, Meckler, Sascha wrote: > >>>> Hi *, > >>>> I have a question about Fuseki: > >>>> > >>>> We have a Fuseki server with one dataset for actual data and one dataset > >>> with reasoning based on the default union graph (=data from first > >>> dataset). > >>> When I insert new data into the first dataset, the inference is not always > >>> triggered. The reasoning dataset updates only at the first time or when > >>> restarting. How can we configurate Fuseki to run the inference every time > >>> that new data is inserted into the first dataset? Or is there a better way > >>> to do this? > >>> > >>> For forward rules, I think that the data updates have to go through the > >>> graph with the inference. Forward rules keep state so if you bypass > >>> inference the graph, the state does not get updated. > >>> > >>> Backwards rules may notice to some extent - I'm unsure of the details > >>> here. > >>> > >>> Pellet isn't part of the Apache Jena project. > >>> > >>> Andy > >>> > >>>> > >>>> I created a small demo project with an easy example and additional > >>> documentation [1]. My student asked on StackOverflow [2] in January but > >>> there was no answer. > >>>> > >>>> Thank you very much for your help! > >>>> Best regards, > >>>> Sascha > >>>> > >>>> [1] https://github.com/smeckler/inference-demo > >>>> [2] > >>> https://stackoverflow.com/questions/59952945/reasoning-in-apache-jena- > >> fuseki-reload-dataset-or-trigger-inference > >>>> > >>>> ______________________________________________________ > >>>> Sascha Meckler > >>>> Data Spaces and IoT Solutions > >>>> > >>>> Fraunhofer-Institut für Integrierte Schaltungen > >>> > >> <https://www.google.com/maps/search/tut+f%C3%BCr+Integrierte+Schaltun > >> gen?entry=gmail&source=g> > >>> IIS > >>>> Nordostpark 93 | 90411 Nürnberg > >>>> > >>>> Phone +49 911 58061-9614 > >>>> > >>>> > >>> > >> -- > >> > >> > >> --- > >> Marco Neumann > >> KONA >
