Hi All, Correcting a link.... This one
www.executable-english.com/demo_agents/RDFQu eryLangComparison1.agent <http://www.executable-english.com/demo_agents/RDFQueryLangComparison1.agent> should of course be www.executable-english.com/demo_agents/RDFQueryLangComparison1.agent Based on comments so far, this one may also be useful www.executable-english.com/A_Wiki_for_Business_Rules_in_Open_Vocabulary_Executable_English.pdf Cheers, -- Adrian On Wed, Mar 13, 2019 at 11:50 AM Adrian Walker <adriandwal...@gmail.com> wrote: > Hi Lorenz &All, > > *Marco*'s original question was > > > *what's your current recommendation for a superior third party rules > reasoner that works efficiently with the jena tooling? free & commercial > option welcome * > Lorenz B. wrote: > > > *The code [1] 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?* > > Actually, the user does not have to register with the reasoner endpoint, > either from a Java client, or from a browser in shared mode. Registration > is > only for a more private way of using the system. > > Small examples run without the need for for a SQL database. For larger > examples the > system automatically generates and runs SQL queries "under the covers". > The SQL generator could in principle be modified to emit SPARQL queries. > > Here's a simple example of querying RDF [2]. > > HTH, -- Adrian > > > [1] www.executable-english.com/iblClient1.java > <http://www.executable-english.com/iblClient1.java> > > [2] www.executable-english.com/demo_agents/RDFQu eryLangComparison1.agent > > <http://www.executable-english.com/demo_agents/RDFQueryLangComparison1.agent> > > > > On Wed, Mar 13, 2019 at 1:39 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 >> >>
