Thank you for the attempt to further clarify Adrians "contribution" here Lorenz. I did send a reply unintentionally directly to Adrian yesterday omitting the list.
So here I go again: Thank You Adrian, I was thinking more along the lines of an updated version of a list for Jena like https://www.w3.org/2005/rules/wg/wiki/List_of_Rule_Systems or https://www.w3.org/2001/sw/wiki/Category:Rule_Reasoner over the years they seem to have constantly ignored you and IBL in the reports. wonder why ... is it a hosted system only? On Wed, Mar 13, 2019 at 8:39 AM Lorenz B. <buehm...@informatik.uni-leipzig.de> wrote: > > I don't see how this link to some code example to some whatever online > service answers his question...can you explain this please a bit more? > > I mean, if I understood correctly, Marco was asking for some rule engine > that can be combined with Apache Jena. So, I'd expect something like > Drools engine with a Jena adapter or the like. And ideally I guess a > standalone, open source, free to use tool. > > I read through your research paper but couldn't figure out what the > underlying rule engine is based on nor could I see any benchmarks w.r.t. > performance. > Moreover, the code just indicates to use some online service - so a user > has to register and, as far as I can see, has to pay US $100 per month. > And you need the data as SQL database? Or can it process RDF directly? > > Sorry for my questions, it's just because I've never heard about this > tool before. And I'm a bit confused how it works on RDF data. > > > > Marco, > > > > This might be of interest: > > > > www.executable-english.com/iblClient1.java > > > > HTH, -- Adrian > > > > On Tue, Mar 12, 2019 at 3:18 PM Marco Neumann <marco.neum...@gmail.com> > > wrote: > > > >> so what's your current recommendation for a superior third party rules > >> reasoner that works efficiently with the jena tooling? free & commercial > >> option welcome > >> > >> Marco > >> > >> > >> > >> On Mon 14. Jan 2019 at 19:16, Dave Reynolds <dave.e.reyno...@gmail.com> > >> wrote: > >> > >>> Hi Barry, > >>> > >>> [Agreed that dev is probably the better place to discuss this.] > >>> > >>> The two engines in jena are indeed loosely styled on RETE and on tabled > >>> datalog. However, I wouldn't claim they were particularly complete or > >>> good implementations of either. So while looking at some of the source > >>> literature that inspired them might be helpful don't expect very much of > >>> what's covered in the literature to be present in the code. > >>> > >>> For RETE then the wikipedia article [1] is a good summary and source of > >>> starting references. I had a copy of the original Forgy paper [1](ref > >>> 1), among others,when I was doing the work. There has been a *lot* of > >>> work on improvements to RETE since the 80s and while there were times > >>> when we might have done a new forward engine using more modern > >>> techniques it never happened. > >>> > >>> For the backward engine the approach is a variant of SLG-WAM as used for > >>> XSB but highly highly simplified since we can't express general tuples > >>> or recursive data structures within jena's triples. A few google > >>> searches haven't turned up the exact paper that originally inspired the > >>> approach. The closest I've found are [2] and [3], which probably cover > >>> the same ground. > >>> > >>> Let me reinforce that the Jena engines are really simplified. They were > >>> enough to get the job done at the time (over a decade ago now) and have > >>> proved useful for some people since but I wouldn't want to defend any of > >>> the implementation choices. > >>> > >>> Dave > >>> > >>> [1] https://en.wikipedia.org/wiki/Rete_algorithm > >>> [2] > >>> > >>> > >> https://pdfs.semanticscholar.org/2078/96964ee85f983cd861a4f8c5dff0bfc9f03e.pdf > >>> [3] > >>> > >>> > >> https://pdfs.semanticscholar.org/6c6d/26e8fe1b755140ffcb57025b021a046b2a3b.pdf > >>> On 14/01/2019 16:33, ajs6f wrote: > >>>> I have no useful general information about the reasoning framework, but > >>> I am copying this over to dev@. Discussions of how to extend Jena > >>> definitely have a place there. > >>>> ajs6f > >>>> > >>>>> On Jan 14, 2019, at 6:40 AM, Nouwt, B. (Barry) > >>> <barry.no...@tno.nl.INVALID> wrote: > >>>>> Hi all, I want to investigate the inner workings of the > >>> GenericRuleReasoner (with the purpose of extending it in the future). In > >>> Jena's documentation I read: > >>>>> "Jena includes a general purpose rule-based reasoner which is used to > >>> implement both the RDFS and OWL reasoners but is also available for > >> general > >>> use. This reasoner supports rule-based inference over RDF graphs and > >>> provides forward chaining, backward chaining and a hybrid execution > >> model. > >>> To be more exact, there are two internal rule engines one forward > >> chaining > >>> RETE engine and one tabled datalog engine - they can be run separately or > >>> the forward engine can be used to prime the backward engine which in turn > >>> will be used to answer queries." > >>>>> source: https://jena.apache.org/documentation/inference/#rules > >>>>> > >>>>> Apart from Jena's documentation, Jena's mailing lists and its source > >>> code, are there any resources that can better help me grasp what is > >>> happening inside the generic rule reasoner? For example, the text above > >>> mentions the forward chaining RETE engine and the tabled datalog engine, > >>> are there any scientific papers that I might read to better understand > >>> their inner workings? > >>>>> Maybe this question is better suited for the d...@jena.apache.org > >>> <mailto:d...@jena.apache.org>? > >>>>> Regards, Barry > >>>>> This message may contain information that is not intended for you. If > >>> you are not the addressee or if this message was sent to you by mistake, > >>> you are requested to inform the sender and delete the message. TNO > >> accepts > >>> no liability for the content of this e-mail, for the manner in which you > >>> use it and for damage of any kind resulting from the risks inherent to > >> the > >>> electronic transmission of messages. > >> -- > >> > >> > >> --- > >> Marco Neumann > >> KONA > >> > -- > Lorenz Bühmann > AKSW group, University of Leipzig > Group: http://aksw.org - semantic web research center > -- --- Marco Neumann KONA
